diff --git a/geoarray/__init__.py b/geoarray/__init__.py
index 5845a83c35d8b54da899ce33d7332535e36d7284..66483bef71200bcb0b6bc59aff420cf62fc2f53a 100644
--- a/geoarray/__init__.py
+++ b/geoarray/__init__.py
@@ -1,5 +1,26 @@
 # -*- coding: utf-8 -*-
 
+# geoarray, A fast Python interface for image geodata - either on disk or in memory.
+#
+# Copyright (C) 2019  Daniel Scheffler (GFZ Potsdam, daniel.scheffler@gfz-potsdam.de)
+#
+# This software was developed within the context of the GeoMultiSens project funded
+# by the German Federal Ministry of Education and Research
+# (project grant code: 01 IS 14 010 A-C).
+#
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# 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 Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 import os
 if 'MPLBACKEND' not in os.environ:
     os.environ['MPLBACKEND'] = 'Agg'
diff --git a/geoarray/baseclasses.py b/geoarray/baseclasses.py
index 97c3baffa697d7b193712a4942322b33c7943c2b..08c1ea08ed7085d9e01f5b21310746ea5b05370e 100644
--- a/geoarray/baseclasses.py
+++ b/geoarray/baseclasses.py
@@ -1,5 +1,27 @@
 # -*- coding: utf-8 -*-
 
+# geoarray, A fast Python interface for image geodata - either on disk or in memory.
+#
+# Copyright (C) 2019  Daniel Scheffler (GFZ Potsdam, daniel.scheffler@gfz-potsdam.de)
+#
+# This software was developed within the context of the GeoMultiSens project funded
+# by the German Federal Ministry of Education and Research
+# (project grant code: 01 IS 14 010 A-C).
+#
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# 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 Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
 import os
 import warnings
 from pkgutil import find_loader
diff --git a/geoarray/masks.py b/geoarray/masks.py
index 3a62c2c6ed30e536732a5dc4377a68e35a3fb735..b3af139d315c64d4a5de628b1834ad5a54c18560 100644
--- a/geoarray/masks.py
+++ b/geoarray/masks.py
@@ -1,5 +1,26 @@
 # -*- coding: utf-8 -*-
 
+# geoarray, A fast Python interface for image geodata - either on disk or in memory.
+#
+# Copyright (C) 2019  Daniel Scheffler (GFZ Potsdam, daniel.scheffler@gfz-potsdam.de)
+#
+# This software was developed within the context of the GeoMultiSens project funded
+# by the German Federal Ministry of Education and Research
+# (project grant code: 01 IS 14 010 A-C).
+#
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# 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 Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 import numpy as np
 
 # internal imports
diff --git a/geoarray/metadata.py b/geoarray/metadata.py
index cb9fba6785931bbfbba904d2ffe5278b6703e602..58d6334850554719819c3f5d238ec42f69f8de1c 100644
--- a/geoarray/metadata.py
+++ b/geoarray/metadata.py
@@ -1,5 +1,26 @@
 # -*- coding: utf-8 -*-
 
+# geoarray, A fast Python interface for image geodata - either on disk or in memory.
+#
+# Copyright (C) 2019  Daniel Scheffler (GFZ Potsdam, daniel.scheffler@gfz-potsdam.de)
+#
+# This software was developed within the context of the GeoMultiSens project funded
+# by the German Federal Ministry of Education and Research
+# (project grant code: 01 IS 14 010 A-C).
+#
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# 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 Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 import os
 from pprint import pformat
 from copy import deepcopy
diff --git a/geoarray/subsetting.py b/geoarray/subsetting.py
index c54cda5e808bb815a6bf8c4081d7a0faaded1813..50d4d53ccc27eedc11d9f562764faf0935305b3d 100644
--- a/geoarray/subsetting.py
+++ b/geoarray/subsetting.py
@@ -1,5 +1,26 @@
 # -*- coding: utf-8 -*-
 
+# geoarray, A fast Python interface for image geodata - either on disk or in memory.
+#
+# Copyright (C) 2019  Daniel Scheffler (GFZ Potsdam, daniel.scheffler@gfz-potsdam.de)
+#
+# This software was developed within the context of the GeoMultiSens project funded
+# by the German Federal Ministry of Education and Research
+# (project grant code: 01 IS 14 010 A-C).
+#
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# 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 Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 import warnings
 import numpy as np
 from shapely.geometry import box, Polygon
diff --git a/geoarray/version.py b/geoarray/version.py
index 82805dd9cca336d640d1c4af11e1242204bc9992..f6e00309ccbda7d8deb8209cd717b138a44dee9c 100644
--- a/geoarray/version.py
+++ b/geoarray/version.py
@@ -1,2 +1,24 @@
-__version__ = '0.8.20'
-__versionalias__ = '20190709.01'
+# geoarray, A fast Python interface for image geodata - either on disk or in memory.
+#
+# Copyright (C) 2019  Daniel Scheffler (GFZ Potsdam, daniel.scheffler@gfz-potsdam.de)
+#
+# This software was developed within the context of the GeoMultiSens project funded
+# by the German Federal Ministry of Education and Research
+# (project grant code: 01 IS 14 010 A-C).
+#
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# 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 Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+__version__ = '0.8.21'
+__versionalias__ = '20190722.01'
diff --git a/setup.py b/setup.py
index 3682a472ccae9a4ee6a228c511500aa18ded5af9..6f26f4f7b01020cbe0a943980c4b1156debcc04f 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,27 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
+# geoarray, A fast Python interface for image geodata - either on disk or in memory.
+#
+# Copyright (C) 2019  Daniel Scheffler (GFZ Potsdam, daniel.scheffler@gfz-potsdam.de)
+#
+# This software was developed within the context of the GeoMultiSens project funded
+# by the German Federal Ministry of Education and Research
+# (project grant code: 01 IS 14 010 A-C).
+#
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# 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 Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 from setuptools import setup, find_packages
 import warnings
 from pkgutil import find_loader
diff --git a/tests/__init__.py b/tests/__init__.py
index 40a96afc6ff09d58a702b76e3f7dd412fe975e26..9664f4c00ebc871eb70d9099c24d7b522460ec16 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1 +1,22 @@
 # -*- coding: utf-8 -*-
+
+# geoarray, A fast Python interface for image geodata - either on disk or in memory.
+#
+# Copyright (C) 2019  Daniel Scheffler (GFZ Potsdam, daniel.scheffler@gfz-potsdam.de)
+#
+# This software was developed within the context of the GeoMultiSens project funded
+# by the German Federal Ministry of Education and Research
+# (project grant code: 01 IS 14 010 A-C).
+#
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# 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 Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
diff --git a/tests/test_geoarray.py b/tests/test_geoarray.py
index 950c91e4d10514361205cc3a272c38c6563067ca..680003700111764ae59aa71d185852564ba7d845 100644
--- a/tests/test_geoarray.py
+++ b/tests/test_geoarray.py
@@ -1,8 +1,30 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
+
+# geoarray, A fast Python interface for image geodata - either on disk or in memory.
+#
+# Copyright (C) 2019  Daniel Scheffler (GFZ Potsdam, daniel.scheffler@gfz-potsdam.de)
+#
+# This software was developed within the context of the GeoMultiSens project funded
+# by the German Federal Ministry of Education and Research
+# (project grant code: 01 IS 14 010 A-C).
+#
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# 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 Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 """
 test_geoarray
-----------------------------------
+-------------
 
 Tests for the functions of the "GeoArray"-class in the "geoarray" module.
 For this purpose the TIFF-file "L8_2bands_extract10x11.tif" and the array of
@@ -17,9 +39,7 @@ test case 1 (path) - test case 2 (path) - test case 1 (array) - test case 2 (arr
 Note that the tests in the test case "Test_GeoarrayAppliedOnPathArray" and
 "Test_GeoarrayFunctions" follow - with a few exceptions - the same order as in the
 "GeoArray"-class (but they are executed in alphanumeric order inside the test case).
-Functions that depend on each other are tested together.
-
-Program started in Mai 2017.
+Functions that depend on each other are tested together..
 """
 from __future__ import print_function
 from collections import OrderedDict
diff --git a/tests/test_metadata.py b/tests/test_metadata.py
index af7ee35cb7a13314d649d3736abbe9d1bfa01842..7c650095760a28c8924e99135a30de460dc76206 100644
--- a/tests/test_metadata.py
+++ b/tests/test_metadata.py
@@ -1,6 +1,27 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
+# geoarray, A fast Python interface for image geodata - either on disk or in memory.
+#
+# Copyright (C) 2019  Daniel Scheffler (GFZ Potsdam, daniel.scheffler@gfz-potsdam.de)
+#
+# This software was developed within the context of the GeoMultiSens project funded
+# by the German Federal Ministry of Education and Research
+# (project grant code: 01 IS 14 010 A-C).
+#
+# This program is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option) any
+# later version.
+#
+# 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 Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 from unittest import TestCase
 import os
 import numpy as np