diff --git a/bench/ltl2tgba/Makefile.am b/bench/ltl2tgba/Makefile.am
index aae9fe999..1f1d67bdd 100644
--- a/bench/ltl2tgba/Makefile.am
+++ b/bench/ltl2tgba/Makefile.am
@@ -1,3 +1,22 @@
+## -*- coding: utf-8 -*-
+## Copyright (C) 2013 Laboratoire de Recherche et Développement de
+## l'Epita (LRDE).
+##
+## This file is part of Spot, a model checking library.
+##
+## Spot 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.
+##
+## Spot 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/>.
+
 EXTRA_DIST = \
   algorithms \
   big \
diff --git a/bench/ltl2tgba/sum.py b/bench/ltl2tgba/sum.py
index edc5eac3b..b90566c98 100755
--- a/bench/ltl2tgba/sum.py
+++ b/bench/ltl2tgba/sum.py
@@ -1,4 +1,23 @@
 #!/usr/bin/env python3
+## -*- coding: utf-8 -*-
+## Copyright (C) 2013 Laboratoire de Recherche et Développement de
+## l'Epita (LRDE).
+##
+## This file is part of Spot, a model checking library.
+##
+## Spot 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.
+##
+## Spot 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 json
 import argparse