diff --git a/clone_ctdas.sh b/clone_ctdas.sh
index c8df8c0f1ea9b2e69b0a8af8ccfe195fa9895eeb..8ae886e93977b26ae2acf33b316580da0b8a44d5 100755
--- a/clone_ctdas.sh
+++ b/clone_ctdas.sh
@@ -1,3 +1,16 @@
+# CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+# Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+# updates of the code. See also: http://www.carbontracker.eu. 
+#
+# This program is free software: you can redistribute it and/or modify it under the
+# terms of the GNU General Public License as published by the Free Software Foundation, 
+# version 3. This program is distributed in the hope that it will be useful, but 
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+#
+# You should have received a copy of the GNU General Public License along with this 
+# program. If not, see <http://www.gnu.org/licenses/>. 
+
 #!/bin/bash
 set -e
 
diff --git a/da/analysis/expand_fluxes.py b/da/analysis/expand_fluxes.py
index 3a5a0fbcdceb1bc0f556cfb4f3cc1f03b759a7eb..aa91400c81c1a1e8bd95eedc3588329fda581b97 100755
--- a/da/analysis/expand_fluxes.py
+++ b/da/analysis/expand_fluxes.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # expand_fluxes.py
 import sys
diff --git a/da/analysis/expand_molefractions.py b/da/analysis/expand_molefractions.py
index 681d45814c9d26015e735a5fbac8ff7727506d39..4d614d044832f59e1b3d732a34c9ae0f06bfa93c 100755
--- a/da/analysis/expand_molefractions.py
+++ b/da/analysis/expand_molefractions.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # expand_fluxes.py
 import sys
diff --git a/da/analysis/merge_ctdas_runs.py b/da/analysis/merge_ctdas_runs.py
index affab0ce21fe5618cba5906c18a1d75b76d1fd50..6df2d429ded912e0c4060edc22c7da9f04b8f095 100755
--- a/da/analysis/merge_ctdas_runs.py
+++ b/da/analysis/merge_ctdas_runs.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # merge_ctdas_runs.py
 
diff --git a/da/analysis/siteseries.py b/da/analysis/siteseries.py
index 1c7d0cc578b0698527c40464da6a68701fdb1908..7512574ca9daff09a090e9ddfe8e53031871869f 100755
--- a/da/analysis/siteseries.py
+++ b/da/analysis/siteseries.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # siteseries_c.py
 
diff --git a/da/analysis/summarize_obs.py b/da/analysis/summarize_obs.py
index ad92730f21158eecb3294912605aa1fa20f3404c..5b13c804ffa72a74da739edd8afac41cafbac970 100755
--- a/da/analysis/summarize_obs.py
+++ b/da/analysis/summarize_obs.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 import sys
 sys.path.append('../../')
diff --git a/da/analysis/time_avg_fluxes.py b/da/analysis/time_avg_fluxes.py
index 7ccf3a804df0d447ae7fb5a088d70324f2f23217..0d3a0146491350f6639e548c1b4d2ae47aa610d9 100755
--- a/da/analysis/time_avg_fluxes.py
+++ b/da/analysis/time_avg_fluxes.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # time_avg_fluxes.py
 
diff --git a/da/analysis/tools_country.py b/da/analysis/tools_country.py
index 9d523242ba6bf305a2c693b572322c32daf8ce1f..00943548f44eb5b85aed957a394dea8031ad2a4f 100755
--- a/da/analysis/tools_country.py
+++ b/da/analysis/tools_country.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # tools_country.py
 
diff --git a/da/analysis/tools_regions.py b/da/analysis/tools_regions.py
index 57533862a60bc8d10827fe343e3c8dddb49b734c..21e4c8a5db4d7b339a8fef0c20bb7ae74a3a6b4f 100755
--- a/da/analysis/tools_regions.py
+++ b/da/analysis/tools_regions.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 
 import numpy as np
diff --git a/da/analysis/tools_time.py b/da/analysis/tools_time.py
index 65ed6a59741a536f7a3d1911c53dfc74fd72d316..a8e8afbf7f25232d65daed318646d6bb37ab32ac 100755
--- a/da/analysis/tools_time.py
+++ b/da/analysis/tools_time.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #! /usr/bin/env python
 import sys
 import calendar
diff --git a/da/analysis/tools_transcom.py b/da/analysis/tools_transcom.py
index 22ff2e5ce969af118e287a89f3df02f1a63e1fd1..68287fb065644e5e8184b1c9bf13b5e8012c0da1 100755
--- a/da/analysis/tools_transcom.py
+++ b/da/analysis/tools_transcom.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 
 import os
diff --git a/da/baseclasses/dasystem.py b/da/baseclasses/dasystem.py
index f5b5d3aa364811af8de3814dc4848ed620e9938d..250ff546a4860afd002ad4186b93bb8a84a93306 100755
--- a/da/baseclasses/dasystem.py
+++ b/da/baseclasses/dasystem.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # control.py
 
diff --git a/da/baseclasses/obs.py b/da/baseclasses/obs.py
index 4a91dd9ae6542a4130d876014ad61c4646e61e17..045038fa726ef9b9308440a348e65a4d4cc3bee9 100755
--- a/da/baseclasses/obs.py
+++ b/da/baseclasses/obs.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # obs.py
 
diff --git a/da/baseclasses/observationoperator.py b/da/baseclasses/observationoperator.py
index 5aecd02e5fa33204fd1ae762f6fc1e2282569b15..4b61b2cebf4e35fb57116aacfcf48a0b1600686b 100755
--- a/da/baseclasses/observationoperator.py
+++ b/da/baseclasses/observationoperator.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # model.py
 
diff --git a/da/baseclasses/optimizer.py b/da/baseclasses/optimizer.py
index b9bc2c31acdb9cda49092a0d39af8100489d2d1b..e05b9fb0ec614c4981448abe8a94368e95e21825 100755
--- a/da/baseclasses/optimizer.py
+++ b/da/baseclasses/optimizer.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # optimizer.py
 
diff --git a/da/baseclasses/platform.py b/da/baseclasses/platform.py
index ae4e35cb859ee1cf0545052d34217a7205e0610b..fbdf0cb3bb0ee2961585fb086a98551df7bc4228 100755
--- a/da/baseclasses/platform.py
+++ b/da/baseclasses/platform.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # jobcontrol.py
 
diff --git a/da/baseclasses/statevector.py b/da/baseclasses/statevector.py
index 04d4335b1115b2547237f4551e9b2cc0efbc132a..b9d94b4897381baa1aeb2cd9e193372ed3dc5b86 100755
--- a/da/baseclasses/statevector.py
+++ b/da/baseclasses/statevector.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # ct_statevector_tools.py
 
diff --git a/da/carbondioxide/dasystem.py b/da/carbondioxide/dasystem.py
index 2f95c2caa6eba2d4e80c4d913f4d81a409db78db..47d78a29dcddd4649048bd9eaff11d93ec84864c 100755
--- a/da/carbondioxide/dasystem.py
+++ b/da/carbondioxide/dasystem.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # control.py
 
diff --git a/da/carbondioxide/obs.py b/da/carbondioxide/obs.py
index 8c6d171a572f4501f2d95b8e77903f725e4d75c5..2b942f12ef8de989463b8d60dfb09270ff8d5c7b 100755
--- a/da/carbondioxide/obs.py
+++ b/da/carbondioxide/obs.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # obs.py
 
diff --git a/da/carbondioxide/obspack.py b/da/carbondioxide/obspack.py
index e69a5cc05774396b98938c57880119663ba42ea4..1a2c44ce192c416bab6810b8515bb6d4e8ffa827 100755
--- a/da/carbondioxide/obspack.py
+++ b/da/carbondioxide/obspack.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # obs.py
 
diff --git a/da/carbondioxide/obspack_geocarbon.py b/da/carbondioxide/obspack_geocarbon.py
index 6bf6fad7d5ff37e78c44a3b15fbfa074b3791b50..5f184dfd9e87e8a7ac254db11a4189f4d2ee6224 100755
--- a/da/carbondioxide/obspack_geocarbon.py
+++ b/da/carbondioxide/obspack_geocarbon.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # obs.py
 
diff --git a/da/carbondioxide/obspack_globalviewplus.py b/da/carbondioxide/obspack_globalviewplus.py
index 7712b34348d546e6210b5c9490c7733a646b13e9..037f1652a9c79803fabc6c32f7ba5a7912d10663 100755
--- a/da/carbondioxide/obspack_globalviewplus.py
+++ b/da/carbondioxide/obspack_globalviewplus.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # obs.py
 
diff --git a/da/carbondioxide/obspack_globalviewplus2.py b/da/carbondioxide/obspack_globalviewplus2.py
index 2b92f7344c25ab091565706196e02df47c2066f3..220cc9657443a87e76144b6239117ca035dbc77d 100755
--- a/da/carbondioxide/obspack_globalviewplus2.py
+++ b/da/carbondioxide/obspack_globalviewplus2.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # obs.py
 
diff --git a/da/carbondioxide/optimizer.py b/da/carbondioxide/optimizer.py
index 15b40583128980456d5745b082e7bd4e2b18817d..a188c194a835defdcf8f78887e40e3fe37f9a1d8 100755
--- a/da/carbondioxide/optimizer.py
+++ b/da/carbondioxide/optimizer.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # optimizer.py
 
diff --git a/da/carbondioxide/standardvariables.py b/da/carbondioxide/standardvariables.py
index 9eac8f64499b0e5e93c6f65c5de4e2f30681d877..b7dc1e1849efca33a6d0bd0a7c63dee5ad67a55d 100755
--- a/da/carbondioxide/standardvariables.py
+++ b/da/carbondioxide/standardvariables.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 standard_variables = { 'bio_flux_prior' : {'name'        : 'bio_flux_prior',\
                                          'units'         : 'mol m-2 s-1' ,\
                                          'long_name'     : 'Surface flux of carbon dioxide, terrestrial vegetation, not optimized ', \
diff --git a/da/carbondioxide/statevector.py b/da/carbondioxide/statevector.py
index b7b290d53f970a317dd82f61cb16d11b5b621e84..a371fd9d0c454560558d0c3ffd0f9ebbb6b3024a 100755
--- a/da/carbondioxide/statevector.py
+++ b/da/carbondioxide/statevector.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # ct_statevector_tools.py
 
diff --git a/da/co2gridded/dasystem.py b/da/co2gridded/dasystem.py
index 25018ea98cfdd27bdbab4fdec94cf88eac5dd2fe..8c94d5daf9c128e4d9f97bfdaa840aac0fbf05a0 100755
--- a/da/co2gridded/dasystem.py
+++ b/da/co2gridded/dasystem.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # control.py
 
diff --git a/da/co2gridded/statevector.py b/da/co2gridded/statevector.py
index 2c5e49a0df6926aec510c808523d231aaf048c0b..b145f6215087d487978493e68a53709dd418c02d 100755
--- a/da/co2gridded/statevector.py
+++ b/da/co2gridded/statevector.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # ct_statevector_tools.py
 
diff --git a/da/co2gridded/statevectorNHgridded.py b/da/co2gridded/statevectorNHgridded.py
index 6b7e44f3ef18fa777d604abd2f78fabcb543bba7..3e621b28e00df65b9a3207d0fb729742cc533cd9 100755
--- a/da/co2gridded/statevectorNHgridded.py
+++ b/da/co2gridded/statevectorNHgridded.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # ct_statevector_tools.py
 
diff --git a/da/doc/source/conf.py b/da/doc/source/conf.py
index 097333b4526d77dc09898f55fc7f7626bfbf6490..9235dc527cde5492aa6c2ce630293fbccb7cc6f0 100644
--- a/da/doc/source/conf.py
+++ b/da/doc/source/conf.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 # -*- coding: utf-8 -*-
 #
 # CarbonTracker Data Assimilation Shell documentation build configuration file, created by
diff --git a/da/examples/das.py b/da/examples/das.py
index 7ebb0f34ad67f5e2159322dff3ad90231b03514d..f0a866dccce994f49f4599ccf0215dcfb439ceb7 100755
--- a/da/examples/das.py
+++ b/da/examples/das.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 
 #################################################################################################
diff --git a/da/examples/dasgridded.py b/da/examples/dasgridded.py
index 1a79e2df4b9f7f87aba8a3167115b0aecbb00cb2..1ed705efa766de6060102932f7cdea140d3d3b1b 100755
--- a/da/examples/dasgridded.py
+++ b/da/examples/dasgridded.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 
 #################################################################################################
diff --git a/da/examples/dasjet.py b/da/examples/dasjet.py
index fb519b411464bb057cbfe197e6e6cb0b47794d32..0873717838074fd20df059eb1e1743718113c89e 100755
--- a/da/examples/dasjet.py
+++ b/da/examples/dasjet.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 
 #################################################################################################
diff --git a/da/methane/analysis/expand_fluxes.py b/da/methane/analysis/expand_fluxes.py
index e91f7c1abb443ceb09f6fba3f3020c0024dbd6af..15d12d120dd62a747a747013de450da161c55dda 100755
--- a/da/methane/analysis/expand_fluxes.py
+++ b/da/methane/analysis/expand_fluxes.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # expand_fluxes.py
 import sys
diff --git a/da/methane/analysis/tools_regions.py b/da/methane/analysis/tools_regions.py
index 2f267f2474e7ce410a5535dbf77143b9c230f9b0..7b48a93a24e764078da8bd8a2b40e8eeabc5758c 100755
--- a/da/methane/analysis/tools_regions.py
+++ b/da/methane/analysis/tools_regions.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 
 import numpy as np
diff --git a/da/methane/analysis_2lambdas/expand_fluxes.py b/da/methane/analysis_2lambdas/expand_fluxes.py
index 0af128caa2404cdef7c7a2cd9ae1653ac8a5a6df..ad80bded752f324ac347e4f27db5899bc846f5c5 100755
--- a/da/methane/analysis_2lambdas/expand_fluxes.py
+++ b/da/methane/analysis_2lambdas/expand_fluxes.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # expand_fluxes.py
 import sys
diff --git a/da/methane/dasystem.py b/da/methane/dasystem.py
index 65184e9020fb4db89d474e4c8aa08d2d3bcbce90..d54bb57a97473eb6e17b9075ca82eab532dab253 100755
--- a/da/methane/dasystem.py
+++ b/da/methane/dasystem.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # control.py
 
diff --git a/da/methane/initexit.py b/da/methane/initexit.py
index 8e9fb5b045f80ca9a31d548b676118a616518d1e..475c20a0d0875d8379a9cc17f913b4ff1117c6a2 100755
--- a/da/methane/initexit.py
+++ b/da/methane/initexit.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # da_initexit.py
 
diff --git a/da/methane/io4.py b/da/methane/io4.py
index 2a6b506212db09e155fc406e74cf19dd06606357..5624873b1cd61a88fb36984417022abd6e210904 100755
--- a/da/methane/io4.py
+++ b/da/methane/io4.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # io.py
 
diff --git a/da/methane/obs.py b/da/methane/obs.py
index 6f08d9dd2b82d0a0351cd12a17beb00ec9030d12..ba5bd4b104265e73a13faf6a9b145ead29b0e1ef 100755
--- a/da/methane/obs.py
+++ b/da/methane/obs.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # obs.py
 
diff --git a/da/methane/optimizer.py b/da/methane/optimizer.py
index c27feaca19cb52b74f652f823e2ed2bd5c388f8e..163480336d79ae832f565e6a1fa57676abb722d3 100755
--- a/da/methane/optimizer.py
+++ b/da/methane/optimizer.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # optimizer.py
 
diff --git a/da/methane/pipeline.py b/da/methane/pipeline.py
index 01e2456dc4de02dabb4cdc19a638473565df5e2e..a644d0a21c1943d16c8408a244398642af4686cb 100755
--- a/da/methane/pipeline.py
+++ b/da/methane/pipeline.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # pipeline.py
 
diff --git a/da/methane/standardvariables.py b/da/methane/standardvariables.py
index 6f046b0ea4f5323e457ab7e003de59da4123730b..e58a20bd836332a8b63b66502f3b9991e3ee83e9 100755
--- a/da/methane/standardvariables.py
+++ b/da/methane/standardvariables.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 standard_variables = { 'bio_flux_prior' : {'name'        : 'bio_flux_prior',\
                                          'units'         : 'mol m-2 s-1' ,\
                                          'long_name'     : 'Surface flux of methane, terrestrial biosphere, not optimized ', \
diff --git a/da/methane/statevector.py b/da/methane/statevector.py
index 5b202f8b413b99e7f533af2132177964cfdf3be3..6d27370678ae8f12bb2170fe96ca712bf1cacbd0 100755
--- a/da/methane/statevector.py
+++ b/da/methane/statevector.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # ct_statevector_tools.py
 
diff --git a/da/methane/statevector_2lambdas.py b/da/methane/statevector_2lambdas.py
index b64c6330af011a51b8897ea380fb8def95f01c6c..5c137ca153bfd55de47c6cef85c7ea2b616468cb 100755
--- a/da/methane/statevector_2lambdas.py
+++ b/da/methane/statevector_2lambdas.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # ct_statevector_tools.py
 
diff --git a/da/platform/capegrim.py b/da/platform/capegrim.py
index 06c8d103b14f4e052a884ee4036c5804299ce585..1a5e69b6d4011004d803cfc188199c9f63d83e1a 100755
--- a/da/platform/capegrim.py
+++ b/da/platform/capegrim.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # maunaloa.py
 
diff --git a/da/platform/cartesius.py b/da/platform/cartesius.py
index 3539aa8eb83afd681e8015eedd835d767848df98..b6a6fb410d7ec7c2b60cf319e7d03271fca72a05 100755
--- a/da/platform/cartesius.py
+++ b/da/platform/cartesius.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # cartesius.py
 
diff --git a/da/platform/fmi.py b/da/platform/fmi.py
index 9b047d4e3542708732415c7c7aebf3b54639e306..c3458abeaf260f0634550131e295295dcb5fddac 100755
--- a/da/platform/fmi.py
+++ b/da/platform/fmi.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # fmi.py
 
diff --git a/da/platform/huygens.py b/da/platform/huygens.py
index 47727b6b1662dfbae3b41ee8b6d18fe87918e66b..a30b6e86b4105a381e27f947a3777f3da3c9fa28 100755
--- a/da/platform/huygens.py
+++ b/da/platform/huygens.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # maunaloa.py
 
diff --git a/da/platform/jet.py b/da/platform/jet.py
index be876a883adc8b532fabeff53d7ccc3c353cafa5..44e2ac200b96701e340b1da002028df968c78e3f 100755
--- a/da/platform/jet.py
+++ b/da/platform/jet.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # jet.py
 
diff --git a/da/platform/kermadec.py b/da/platform/kermadec.py
index b242a6b12943fe8f316b3f158e2b9b27600f6157..6dd93104823b5aaf868b69df0e7c1b19cc027c4e 100755
--- a/da/platform/kermadec.py
+++ b/da/platform/kermadec.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # kermadec.py
 
diff --git a/da/platform/maunaloa.py b/da/platform/maunaloa.py
index 7d886743739ecc64811802244445fb420b906ab0..7dd5ba916cff16a0ae991c7bebe4379408483daa 100755
--- a/da/platform/maunaloa.py
+++ b/da/platform/maunaloa.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # maunaloa.py
 
diff --git a/da/rc/NamingScheme.wp_Mar2011.rc b/da/rc/NamingScheme.wp_Mar2011.rc
index b1908a121012655261d03735bb4d9115500f2a35..1a98f36ca0de9d7b1634825f7bf484725c1b099b 100644
--- a/da/rc/NamingScheme.wp_Mar2011.rc
+++ b/da/rc/NamingScheme.wp_Mar2011.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 ! output naming scheme for CarbonTracker savestate files, version May 07 by Wouter Peters
 
 ! assimilated quantities, observation details
diff --git a/da/rc/carbontracker.rc b/da/rc/carbontracker.rc
index 08b61213fa2fa68f1c366b9433b2690fc7850a96..041a920d19694caea035c111eace49a01aa662fd 100644
--- a/da/rc/carbontracker.rc
+++ b/da/rc/carbontracker.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 !!! Info for the CarbonTracker data assimilation system
 
 datadir         : /Volumes/DataRaid/CO2/carbontracker/input/ctdas_2012/ 
diff --git a/da/rc/carbontracker_cte2016_20161208.rc b/da/rc/carbontracker_cte2016_20161208.rc
index 2c483dfc5d86572b43b7773e62d3ba4894178fcf..3f7a709e6fa700eda5827d74d389aba49aa340da 100644
--- a/da/rc/carbontracker_cte2016_20161208.rc
+++ b/da/rc/carbontracker_cte2016_20161208.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 !!! Info for the CarbonTracker data assimilation system
 
 datadir         : /projects/0/ctdas/input/ctdas_2012/ 
diff --git a/da/rc/carbontracker_geocarbon_20130820.rc b/da/rc/carbontracker_geocarbon_20130820.rc
index 774a28a3290dd1844c3be23c780295584d1b5473..d067c5aa1962a3c22dce00e73c4c5349546460d0 100644
--- a/da/rc/carbontracker_geocarbon_20130820.rc
+++ b/da/rc/carbontracker_geocarbon_20130820.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 !!! Info for the CarbonTracker data assimilation system
 
 datadir         : /scratch/shared/carbontracker/input/ctdas_2012/ 
diff --git a/da/rc/carbontracker_griddedNH.rc b/da/rc/carbontracker_griddedNH.rc
index 042176c15285055312840dc9af7bb93419f8d44e..cace1e71b8c6ed5a3ca772e900d8e99d17dbb4a4 100644
--- a/da/rc/carbontracker_griddedNH.rc
+++ b/da/rc/carbontracker_griddedNH.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 !!! Info for the CarbonTracker data assimilation system
 
 datadir         : /Volumes/DataRaid/CO2/carbontracker/input/ctdas_2012/ 
diff --git a/da/rc/carbontracker_methane.rc b/da/rc/carbontracker_methane.rc
index 5d66148f8aa2f3c420bf1c65feebceda6788dd9b..4efca3bee79f077f281ab025d09bf47b6b762730 100755
--- a/da/rc/carbontracker_methane.rc
+++ b/da/rc/carbontracker_methane.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 !!! Info for the CarbonTracker data assimilation system
 
 
diff --git a/da/rc/carbontracker_sibcasa_regions.rc b/da/rc/carbontracker_sibcasa_regions.rc
index cb906e7f49ae06d5e247393cd23ab8e49d39f3ac..6037a5e29d681aea31555fe1f5b06a9e87cf3ca9 100644
--- a/da/rc/carbontracker_sibcasa_regions.rc
+++ b/da/rc/carbontracker_sibcasa_regions.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 !!! Info for the CarbonTracker data assimilation system
 
 datadir         : /Volumes/DataRaid/CO2/carbontracker/input/ctdas_2012/ 
diff --git a/da/rc/carbontracker_sibcasa_sam_koppen_regions.rc b/da/rc/carbontracker_sibcasa_sam_koppen_regions.rc
index 356a9a2559f3f5bfef10376e61353fefb76e66b6..4b679195f8aae50953d9a951b5071093e2463c6c 100644
--- a/da/rc/carbontracker_sibcasa_sam_koppen_regions.rc
+++ b/da/rc/carbontracker_sibcasa_sam_koppen_regions.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 !!! Info for the CarbonTracker data assimilation system
 
 datadir         : /Volumes/DataRaid/CO2/carbontracker/input/ctdas_2012/ 
diff --git a/da/rc/carbontrackergridded.rc b/da/rc/carbontrackergridded.rc
index f856d35304a57910019cae8ee74cd1720206502c..7908a1019feace90352c579e15c427072299716f 100644
--- a/da/rc/carbontrackergridded.rc
+++ b/da/rc/carbontrackergridded.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 !!! Info for the CarbonTracker data assimilation system
 
 datadir         : /Storage/CO2/carbontracker/input/ctdas_2012/
diff --git a/da/rc/carbontrackerjet.rc b/da/rc/carbontrackerjet.rc
index c7f99401897c51edaaedea4f6ef3397c3a128a72..c65cf80943653d05aee58bf5efcfb4f8a503d550 100644
--- a/da/rc/carbontrackerjet.rc
+++ b/da/rc/carbontrackerjet.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 !!! Info for the CarbonTracker data assimilation system
 
 datadir         : /lfs0/projects/co2/input/ct_new_2010
diff --git a/da/rc/ctdas-sf6.rc b/da/rc/ctdas-sf6.rc
index 7f041f91e4c1d5a4a24fe777e2ca033d4a21a22b..3688a794857512fd384593841872ff801149d6a9 100644
--- a/da/rc/ctdas-sf6.rc
+++ b/da/rc/ctdas-sf6.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 !!! Info for the CarbonTracker data assimilation system
 
 datadir         : /scratch/shared/carbontracker/input/ctdas_2012/
diff --git a/da/rc/da.rc b/da/rc/da.rc
index 871398fe9df6d5164e69c1c4e240b6e28be49e25..fa2fc9fc95b983412735d23acc64d211cf823160 100644
--- a/da/rc/da.rc
+++ b/da/rc/da.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 ! Info on the data assimilation cycle
 
 time.restart        : False
diff --git a/da/rc/dagridded.rc b/da/rc/dagridded.rc
index 0229cf7168c2a1a16ad866d937a33370aea008f5..a5263fb2003f657abedfd65f7943658deb4eef5c 100644
--- a/da/rc/dagridded.rc
+++ b/da/rc/dagridded.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 ! Info on the data assimilation cycle
 
 time.restart        : False
diff --git a/da/rc/dajet.rc b/da/rc/dajet.rc
index ac28d71ab11ef19efb1fe22ecdebafdb8f2587cd..2d5f9d53e27e77d638599a20db8b1947adcad482 100644
--- a/da/rc/dajet.rc
+++ b/da/rc/dajet.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 ! Info on the data assimilation cycle
 
 time.restart        : False
diff --git a/da/rc/sites_and_weights_ctdas.rc b/da/rc/sites_and_weights_ctdas.rc
index 0a59ad7f92f3a53d3149da1e78503c0d8b0be22e..7bc1ee8c661a0953fd23ccc8b304f573c2d28566 100644
--- a/da/rc/sites_and_weights_ctdas.rc
+++ b/da/rc/sites_and_weights_ctdas.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 !
 ! This RC file was re-generated by prep_rc.pl on 2010-09-09 10:11:18 by ken.
 ! Input File: sites_and_weights_co2.ct10.rc
diff --git a/da/rc/sites_and_weights_methane.rc b/da/rc/sites_and_weights_methane.rc
index b06bc7a31b452c76128fbe459177576f4b6eb704..0b03b28d065fff1a64843edf18564fb4925ec664 100755
--- a/da/rc/sites_and_weights_methane.rc
+++ b/da/rc/sites_and_weights_methane.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 !
 ! This RC file was re-generated by prep_rc.pl on 2010-09-09 10:11:18 by ken.
 ! Modified and cleaned by Aki 18 Nov 2014.
diff --git a/da/sf6/pipeline.py b/da/sf6/pipeline.py
index aa6e34532e96e59009fe21f38a3bfdf2a353320e..f5f918b908d7059d8dedeba8c2d97a5b7a5d1384 100755
--- a/da/sf6/pipeline.py
+++ b/da/sf6/pipeline.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # pipeline.py
 
diff --git a/da/sf6/statevector.py b/da/sf6/statevector.py
index 4c440848867f0085647503efbbba752b1e9e39c2..881031f67dd1d5961f2642e9a6080215ea74f1b6 100755
--- a/da/sf6/statevector.py
+++ b/da/sf6/statevector.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # ct_statevector_tools.py
 
diff --git a/da/stilt/carbontracker_griddedNA.rc b/da/stilt/carbontracker_griddedNA.rc
index d85ed89bb3ee2e55eb53dc0957fce56b9f2fd1e2..7ab0b2fda8e6383cd7bbf9f3f13496976b5fe5c0 100644
--- a/da/stilt/carbontracker_griddedNA.rc
+++ b/da/stilt/carbontracker_griddedNA.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 !!! Info for the CarbonTracker data assimilation system
 
 datadir         : /Storage/CO2/carbontracker/input/ctdas_2012/ 
diff --git a/da/stilt/expand_fluxes.py b/da/stilt/expand_fluxes.py
index b5413e5b64913e22010d8f42a0caa7d69bb425e2..df43897d67e2c3709a9cd313331c1eb0d0f5a4e2 100755
--- a/da/stilt/expand_fluxes.py
+++ b/da/stilt/expand_fluxes.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # expand_fluxes.py
 import sys
diff --git a/da/stilt/expand_molefractions.py b/da/stilt/expand_molefractions.py
index 2df7daa9cefd26a16921759ab69b506806a36570..a9fb83a34a594fd60a67543be7dbe4949457174b 100755
--- a/da/stilt/expand_molefractions.py
+++ b/da/stilt/expand_molefractions.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # expand_fluxes.py
 import sys
diff --git a/da/stilt/hysplit.rc b/da/stilt/hysplit.rc
index 2171d2c338e8c7c0fda6da2a14a22046f04beab4..2fc032c6d2bdff5f65a0dd74609015f489450c4a 100644
--- a/da/stilt/hysplit.rc
+++ b/da/stilt/hysplit.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
       sibdir : /Storage/ctdas-wrfstilt/sibcasa_fluxes_2010/day1×1/
       bgfdir : /Storage/co2simu/bgfluxes/3-hourly/
     footpdir : /Storage/ctdas-wrfstilt/hysplit_footprints/
diff --git a/da/stilt/observationoperator.py b/da/stilt/observationoperator.py
index cd6cab5145a443ecb9a90765a5db502a7d604ecf..0f590e68e87afc2bf6b197eef75e1035d971d497 100755
--- a/da/stilt/observationoperator.py
+++ b/da/stilt/observationoperator.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # stilt_tools.py
 
diff --git a/da/stilt/obspack.py b/da/stilt/obspack.py
index 80db702d2bf4c1abaa9792a2a2dfe6df88cafb7b..3387d5e7776b4e6646a908fd17e888efe840b69b 100755
--- a/da/stilt/obspack.py
+++ b/da/stilt/obspack.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 
 # obs.py
diff --git a/da/stilt/optimizer.py b/da/stilt/optimizer.py
index 2590d63dd96213426a559b02dc934b804bf198f5..30a86ab037d41e7f884710d4908c0c57fa894dd7 100755
--- a/da/stilt/optimizer.py
+++ b/da/stilt/optimizer.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # optimizer.py
 
diff --git a/da/stilt/pipeline.py b/da/stilt/pipeline.py
index 5e517c1bfebf6fa78ff1f76fdb11dc652fe28b40..1316d64aabd73915617601cd8e619e44d33a3bb6 100755
--- a/da/stilt/pipeline.py
+++ b/da/stilt/pipeline.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # pipeline.py
 
diff --git a/da/stilt/plot_ctdas_results.py b/da/stilt/plot_ctdas_results.py
index 74194db32d060f1c91550e8539906e7144f0c91f..61758aaee7c3ad9817c7a72e1efcc6f95b7b135c 100644
--- a/da/stilt/plot_ctdas_results.py
+++ b/da/stilt/plot_ctdas_results.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 """
 Purpose:
     To check the optimized results of CTDAS
diff --git a/da/stilt/sites_weights_stilt-updatedfoot-ivar.rc b/da/stilt/sites_weights_stilt-updatedfoot-ivar.rc
index 299327bbd78bbbc6bdd4ba0205fb860216cdf702..f83d3784da6b9f9c500923312cd983ce3f51ebc2 100755
--- a/da/stilt/sites_weights_stilt-updatedfoot-ivar.rc
+++ b/da/stilt/sites_weights_stilt-updatedfoot-ivar.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 !  The threshold for rejecting an observation expressed as a number of
 !  standard deviations away from the model prediciton.  Note that the
 !  standard deviation is sqrt(HQH^T+R).
diff --git a/da/stilt/statevector.py b/da/stilt/statevector.py
index e76b7be88f42c8c944b42f16532bf783c95158b7..d24902e7aaae9874037e48532778a9d197674de5 100755
--- a/da/stilt/statevector.py
+++ b/da/stilt/statevector.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # ct_statevector_tools.py
 
diff --git a/da/stilt/stilt.rc b/da/stilt/stilt.rc
index 0b379261b7525c310ecd354c17592b9119085183..766f529032faac81b6cdfe661c6b3fc3b9ce27aa 100644
--- a/da/stilt/stilt.rc
+++ b/da/stilt/stilt.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
       sibdir : /Storage/ctdas-wrfstilt/sib3_fluxes/day1×1v2/
       bgfdir : /Storage/co2simu/bgfluxes/3-hourly/
     footpdir : /Storage/ctdas-wrfstilt/stilt_footprints/
diff --git a/da/stilt/summarize_obs.py b/da/stilt/summarize_obs.py
index bde551b11538c005068475122752771d54760714..11e065c8c2ee78343d0882d0e33f793009eb5b2e 100755
--- a/da/stilt/summarize_obs.py
+++ b/da/stilt/summarize_obs.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 import sys
 sys.path.append('../../')
diff --git a/da/test/test_optimizer.py b/da/test/test_optimizer.py
index a08d6270ec14a74ff210cebee445495b71f72ca5..2543087e1bdef3db17124d27b88acf5560809ead 100755
--- a/da/test/test_optimizer.py
+++ b/da/test/test_optimizer.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # test_optimizer.py
 
diff --git a/da/tm5/methaneobservationoperator.py b/da/tm5/methaneobservationoperator.py
index 394d693977985c47b6981e52564e34eaebd59050..434e9a4fd67042226388ca8a1c1e20c60c3d7dd8 100755
--- a/da/tm5/methaneobservationoperator.py
+++ b/da/tm5/methaneobservationoperator.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # tm5_tools.py
 
diff --git a/da/tm5/observationoperator.py b/da/tm5/observationoperator.py
index f6a56cb032568c084225e14620c6d299b33ce40b..3713b5af0cf3ebee4c428e1133efaa30414f9456 100755
--- a/da/tm5/observationoperator.py
+++ b/da/tm5/observationoperator.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # tm5_tools.py
 
diff --git a/da/tools/general.py b/da/tools/general.py
index 1167cab04af45474af9a50eeddbf879c322c8295..d74c28abef929598bf67a4793685f1fcba8560ed 100755
--- a/da/tools/general.py
+++ b/da/tools/general.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # tools_da.py
 
diff --git a/da/tools/initexit.py b/da/tools/initexit.py
index 48c1c6412334eb5dc53cec162cf29447feff8ab8..101967313572f4721eacf9d7ecde6efca7047177 100755
--- a/da/tools/initexit.py
+++ b/da/tools/initexit.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # da_initexit.py
 
diff --git a/da/tools/io4.py b/da/tools/io4.py
index fc7e67465cb234a896afeccfbd1895eb4133c98e..59ff046758650c00887056208746cdef52a57938 100755
--- a/da/tools/io4.py
+++ b/da/tools/io4.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # io.py
 
diff --git a/da/tools/molefraction_to_permil.py b/da/tools/molefraction_to_permil.py
index f820579333ca1709738ba20b684f4d166cf0f93e..002429996eed0f3524e735e058f334481cd315e3 100755
--- a/da/tools/molefraction_to_permil.py
+++ b/da/tools/molefraction_to_permil.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # MolefractionToPermil.py
 
diff --git a/da/tools/pipeline.py b/da/tools/pipeline.py
index 6ef491d292320ee048e8480876c08bbe889a0c4f..2ceacc3a00ffa9104f2d7d8b69afca798e1af43c 100755
--- a/da/tools/pipeline.py
+++ b/da/tools/pipeline.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 # pipeline.py
 
diff --git a/da/tools/rc.py b/da/tools/rc.py
index 29d646c2f305a686d2cc5d821b11df3f54f85fd4..8f3fb539e08dafaf82e4c84937c98f34dc368f03 100755
--- a/da/tools/rc.py
+++ b/da/tools/rc.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #! /usr/bin/env python
 # rc.py
 
diff --git a/da/tools/rc_old.py b/da/tools/rc_old.py
index 080217bb34911ca6894750688c1a65a38020985d..f8c27e337a3881ddbe4b6102c9c584b4171a2883 100755
--- a/da/tools/rc_old.py
+++ b/da/tools/rc_old.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #! /usr/bin/env python
 # rc.py
 
diff --git a/da/tools/standardvariables.py b/da/tools/standardvariables.py
index 975af2e4a64b1d3f3bd361b0fc0376b0e7656c13..b6f3163ca8d5b32d7dad792456a6eb66e6c79dc9 100755
--- a/da/tools/standardvariables.py
+++ b/da/tools/standardvariables.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 standard_variables = { 'bio_flux_prior' : {'name'        : 'bio_flux_prior',\
                                          'units'         : 'mol m-2 s-1' ,\
                                          'long_name'     : 'Surface flux of carbon dioxide, terrestrial vegetation, not optimized ', \
diff --git a/go_readrc b/go_readrc
index 45717bc2a810c61e6d3a6ac121a8a97b0571162e..6725a935b50da803c3b739833b3392517124a5be 100644
--- a/go_readrc
+++ b/go_readrc
@@ -1,3 +1,16 @@
+# CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+# Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+# updates of the code. See also: http://www.carbontracker.eu. 
+#
+# This program is free software: you can redistribute it and/or modify it under the
+# terms of the GNU General Public License as published by the Free Software Foundation, 
+# version 3. This program is distributed in the hope that it will be useful, but 
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+#
+# You should have received a copy of the GNU General Public License along with this 
+# program. If not, see <http://www.gnu.org/licenses/>. 
+
 #! /bin/sh
 
 # --- init ---
diff --git a/gpl-3.0.txt b/gpl-3.0.txt
new file mode 100644
index 0000000000000000000000000000000000000000..94a9ed024d3859793618152ea559a168bbcbb5e2
--- /dev/null
+++ b/gpl-3.0.txt
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
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+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
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+
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+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
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+may consider it more useful to permit linking proprietary applications with
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diff --git a/start_ctdas.sh b/start_ctdas.sh
index fd82ebf9f496f1e985f7e588fa4239bbd811555c..bc946c4612bfd46030b618360932335a5e6fe69e 100755
--- a/start_ctdas.sh
+++ b/start_ctdas.sh
@@ -1,3 +1,16 @@
+# CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+# Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+# updates of the code. See also: http://www.carbontracker.eu. 
+#
+# This program is free software: you can redistribute it and/or modify it under the
+# terms of the GNU General Public License as published by the Free Software Foundation, 
+# version 3. This program is distributed in the hope that it will be useful, but 
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+#
+# You should have received a copy of the GNU General Public License along with this 
+# program. If not, see <http://www.gnu.org/licenses/>. 
+
 #!/bin/bash
 set -e
 
diff --git a/stilt.nc4.sib.co2.Feb.2015.May13.r b/stilt.nc4.sib.co2.Feb.2015.May13.r
index 212a0f8a801aef9c87cc03b032c4e1eb227bcdd2..67b8af74100aa8ce25b9226f1b3b07aaeaf9599b 100755
--- a/stilt.nc4.sib.co2.Feb.2015.May13.r
+++ b/stilt.nc4.sib.co2.Feb.2015.May13.r
@@ -1,3 +1,16 @@
+# CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+# Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+# updates of the code. See also: http://www.carbontracker.eu. 
+#
+# This program is free software: you can redistribute it and/or modify it under the
+# terms of the GNU General Public License as published by the Free Software Foundation, 
+# version 3. This program is distributed in the hope that it will be useful, but 
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+#
+# You should have received a copy of the GNU General Public License along with this 
+# program. If not, see <http://www.gnu.org/licenses/>. 
+
 #------------------------------------------------------------------------------------------------
 # CO2 concentration simulation based on WRF-STILT/HYSPLIT-NAM12 footprints and
 # SiB3/4 biosphere fluxes, CarbonTracker background fluxes and boundary conditions
diff --git a/template.py b/template.py
index 2359b4faa659e7e997cbab48cacb07ca93ab5481..bb3b8e18fe862e9bb3d1271384bb04a9b9b5f97a 100755
--- a/template.py
+++ b/template.py
@@ -1,3 +1,15 @@
+"""CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+updates of the code. See also: http://www.carbontracker.eu. 
+
+This program is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software Foundation, 
+version 3. This program is distributed in the hope that it will be useful, but 
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+
+You should have received a copy of the GNU General Public License along with this 
+program. If not, see <http://www.gnu.org/licenses/>."""
 #!/usr/bin/env python
 
 #################################################################################################
@@ -31,6 +43,9 @@ from da.tm5.observationoperator import TM5ObservationOperator
 #################################################################################################
 
 start_logger()
+logging.info(header + "CTDAS Copyright (C) 2017, Wouter Peters " + footer)
+logging.info(header + "This program comes with ABSOLUTELY NO WARRANTY." + footer)
+logging.info(header + "This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 3." + footer)
 opts, args = parse_options()
 opts, args = validate_opts_args(opts, args)
 
diff --git a/template.rc b/template.rc
index c6dfc06e130144f441d123f82767215540dbb3b9..cda0bc78f060cb756d93918ebde0a4510b171f27 100644
--- a/template.rc
+++ b/template.rc
@@ -1,3 +1,16 @@
+! CarbonTracker Data Assimilation Shell (CTDAS) Copyright (C) 2017 Wouter Peters. 
+! Users are recommended to contact the developers (wouter.peters@wur.nl) to receive
+! updates of the code. See also: http://www.carbontracker.eu. 
+!
+! This program is free software: you can redistribute it and/or modify it under the
+! terms of the GNU General Public License as published by the Free Software Foundation, 
+! version 3. This program is distributed in the hope that it will be useful, but 
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
+! FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
+!
+! You should have received a copy of the GNU General Public License along with this 
+! program. If not, see <http://www.gnu.org/licenses/>. 
+
 ! author: Wouter Peters 
 !
 ! This is a blueprint for an rc-file used in CTDAS. Feel free to modify it, and please go to the main webpage for further documentation.