diff --git a/src/ifccityjson/cityjson2ifc.py b/src/ifccityjson/cityjson2ifc.py
index 2a53cb1833..0916fd5bb1 100644
--- a/src/ifccityjson/cityjson2ifc.py
+++ b/src/ifccityjson/cityjson2ifc.py
@@ -1,3 +1,22 @@
+
+# ifccityjson - Python CityJSON to IFC converter
+# Copyright (C) 2021 Laurens J.N. Oostwegel <l.oostwegel@gmail.com>
+#
+# This file is part of ifccityjson.
+#
+# ifccityjson 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.
+#
+# ifccityjson 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 ifccityjson.  If not, see <http://www.gnu.org/licenses/>.
+
 import ifcopenshell
 import ifcopenshell.api
 from geometry import GeometryIO
diff --git a/src/ifccityjson/geometry.py b/src/ifccityjson/geometry.py
index e483d3e6e5..87cebb392c 100644
--- a/src/ifccityjson/geometry.py
+++ b/src/ifccityjson/geometry.py
@@ -1,3 +1,22 @@
+
+# ifccityjson - Python CityJSON to IFC converter
+# Copyright (C) 2021 Laurens J.N. Oostwegel <l.oostwegel@gmail.com>
+#
+# This file is part of ifccityjson.
+#
+# ifccityjson 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.
+#
+# ifccityjson 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 ifccityjson.  If not, see <http://www.gnu.org/licenses/>.
+
 import warnings
 
 class GeometryIO:
diff --git a/src/ifccityjson/ifccityjson.py b/src/ifccityjson/ifccityjson.py
index 49cc0526aa..c8cb23d691 100644
--- a/src/ifccityjson/ifccityjson.py
+++ b/src/ifccityjson/ifccityjson.py
@@ -1,3 +1,22 @@
+
+# ifccityjson - Python CityJSON to IFC converter
+# Copyright (C) 2021 Laurens J.N. Oostwegel <l.oostwegel@gmail.com>
+#
+# This file is part of ifccityjson.
+#
+# ifccityjson 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.
+#
+# ifccityjson 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 ifccityjson.  If not, see <http://www.gnu.org/licenses/>.
+
 import argparse
 from cjio import cityjson
 from cityjson2ifc import Cityjson2ifc