diff --git a/python/opendht.pyx b/python/opendht.pyx
index 397c4c1aaec99bc67334bf2a07961b04b209f3ac..5b7400d95f19aee93696f7816ecf488aea20f8ed 100644
--- a/python/opendht.pyx
+++ b/python/opendht.pyx
@@ -14,19 +14,18 @@
 #
 # This file is part of OpenDHT Python Wrapper.
 #
-#    OpenDHT Python Wrapper 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, either version 3 of the License, or
-#    (at your option) any later version.
+# OpenDHT Python Wrapper 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, either version 3 of the License, or
+# (at your option) any later version.
 #
-#    OpenDHT Python Wrapper 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 OpenDHT Python Wrapper. If not, see <http://www.gnu.org/licenses/>.
+# OpenDHT Python Wrapper 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 OpenDHT Python Wrapper. If not, see <http://www.gnu.org/licenses/>.
 
 from libcpp.map cimport map as map
 from libcpp cimport bool
diff --git a/python/opendht_cpp.pxd b/python/opendht_cpp.pxd
index be718b8a4a24dd840db43f699ad3c47ba2f02f70..29f9f65a6022e66cc6522a1509c47d7d57ac9a85 100644
--- a/python/opendht_cpp.pxd
+++ b/python/opendht_cpp.pxd
@@ -1,6 +1,19 @@
-# Copyright (C) 2015-2016 Savoir-faire Linux Inc.
+# Copyright (c) 2015-2016 Savoir-faire Linux Inc.
 # Author(s): Adrien Béraud <adrien.beraud@savoirfairelinux.com>
 #            Simon Désaulniers <sim.desaulniers@gmail.com>
+#
+# 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; 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 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/>.
 
 from libc.stdint cimport *
 from libcpp cimport bool
diff --git a/python/tools/benchmark.py b/python/tools/benchmark.py
index a6a7dd92c436cc5551f08b78eb56867d9beead35..eede0af1a80a119a34ed5f72bfb0f74a4e90770a 100755
--- a/python/tools/benchmark.py
+++ b/python/tools/benchmark.py
@@ -2,6 +2,19 @@
 # Copyright (C) 2015-2016 Savoir-faire Linux Inc.
 # Author(s): Adrien Béraud <adrien.beraud@savoirfairelinux.com>
 #            Simon Désaulniers <sim.desaulniers@gmail.com>
+#
+# 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; 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 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/>.
 
 import os
 import sys
diff --git a/python/tools/dhtnetwork.py b/python/tools/dhtnetwork.py
index bfa225d00da12085ebd976648e98907d8dd9ab5e..c3dda601fc889c3a4567a0efa3e8f1ebeca63a18 100755
--- a/python/tools/dhtnetwork.py
+++ b/python/tools/dhtnetwork.py
@@ -1,7 +1,20 @@
 #!/usr/bin/env python3
-# Copyright (C) 2015-2016 Savoir-faire Linux Inc.
+# Copyright (c) 2015-2016 Savoir-faire Linux Inc.
 # Author(s): Adrien Béraud <adrien.beraud@savoirfairelinux.com>
 #            Simon Désaulniers <sim.desaulniers@gmail.com>
+#
+# 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; 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 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/>.
 
 import sys
 import signal
diff --git a/python/tools/scanner.py b/python/tools/scanner.py
index c27ab0ea2b2af78677f06ed31d468333fcff1b74..e9ebb1c430ef3c1a05b5df560b2dca24a6cbdef6 100755
--- a/python/tools/scanner.py
+++ b/python/tools/scanner.py
@@ -2,23 +2,18 @@
 # Copyright (c) 2015-2016 Savoir-faire Linux Inc.
 # Author: Adrien Béraud <adrien.beraud@savoirfairelinux.com>
 #
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
+# 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; either version 3 of the License, or
+# (at your option) any later version.
 #
-# The above copyright notice and this permission notice shall be included in
-# all copies or substantial portions of the Software.
+# 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.
 #
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHERWISE
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-# THE SOFTWARE.
+# You should have received a copy of the GNU General Public License
+# along with this program; If not, see <http://www.gnu.org/licenses/>.
 
 import time, sys, os
 from pprint import pprint
diff --git a/python/tools/virtual_network_builder.py b/python/tools/virtual_network_builder.py
index be0e9a98b4b7df3861d30b290189edd20836f785..682d2351d3c0e1f3eefaec56aa527cc5314a1f5a 100755
--- a/python/tools/virtual_network_builder.py
+++ b/python/tools/virtual_network_builder.py
@@ -1,6 +1,19 @@
 #!/usr/bin/env python3
 # Copyright (c) 2015-2016 Savoir-faire Linux Inc.
 # Author: Adrien Béraud <adrien.beraud@savoirfairelinux.com>
+#
+# 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; 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 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/>.
 
 import argparse, subprocess