diff --git a/Makefile.in b/Makefile.in
index c22c71b..14335c5 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -1,3 +1,21 @@
+# This file is part of telegram-purple
+#
+# 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 2 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
+#
+# Copyright Matthias Jentsch, Vitaly Valtman, Christopher Althaus, Markus Endres 2014-2015
+
 srcdir=@srcdir@
 prefix=@prefix@
 datarootdir=@datarootdir@
diff --git a/Makefile.mingw b/Makefile.mingw
index b389e54..848417d 100644
--- a/Makefile.mingw
+++ b/Makefile.mingw
@@ -1,3 +1,21 @@
+# This file is part of telegram-purple
+#
+# 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 2 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
+#
+# Copyright Matthias Jentsch, Vitaly Valtman, Christopher Althaus, Markus Endres, Eion Robb 2014-2015
+
 srcdir=.
 gettext_package=telegram-purple
 
diff --git a/Makefile.tgl.mingw b/Makefile.tgl.mingw
index f094fea..52b0bb6 100644
--- a/Makefile.tgl.mingw
+++ b/Makefile.tgl.mingw
@@ -1,3 +1,21 @@
+# This file is part of telegram-purple
+#
+# 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 2 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
+#
+# Copyright Matthias Jentsch, Vitaly Valtman, Christopher Althaus, Markus Endres, Eion Robb 2014-2015
+
 srcdir=.
 
 SCHEME_VERSION = 38
diff --git a/config.h.mingw b/config.h.mingw
index 699dd0f..5ead13d 100644
--- a/config.h.mingw
+++ b/config.h.mingw
@@ -1,3 +1,21 @@
+# This file is part of telegram-purple
+#
+# 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 2 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
+#
+# Copyright Matthias Jentsch, Vitaly Valtman, Christopher Althaus, Markus Endres, Eion Robb 2014-2015
+
 /* config.h.  Generated from config.h.in by configure.  */
 /* config.h.in.  Generated from configure.ac by autoheader.  */
 
diff --git a/config.h.tgl.mingw b/config.h.tgl.mingw
index 58b24fd..f0cc84f 100644
--- a/config.h.tgl.mingw
+++ b/config.h.tgl.mingw
@@ -1,3 +1,21 @@
+# This file is part of telegram-purple
+#
+# 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 2 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
+#
+# Copyright Matthias Jentsch, Vitaly Valtman, Christopher Althaus, Markus Endres, Eion Robb 2014-2015
+
 /* config.h.  Generated from config.h.in by configure.  */
 /* config.h.in.  Generated from configure.ac by autoheader.  */
 
diff --git a/configure.ac b/configure.ac
index ffcc79b..52420ad 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,3 +1,21 @@
+# This file is part of telegram-purple
+#
+# 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 2 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
+#
+# Copyright Matthias Jentsch, Vitaly Valtman, Christopher Althaus, Markus Endres 2014-2015
+
 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 
diff --git a/telegram-purple.nsi b/telegram-purple.nsi
index c58fdd9..f0e40d4 100644
--- a/telegram-purple.nsi
+++ b/telegram-purple.nsi
@@ -1,5 +1,22 @@
-; Script based on the Skype4Pidgin and Off-the-Record Messaging NSI files
+; This file is part of telegram-purple
+;
+; 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 2 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, write to the Free Software
+; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
+;
+; Copyright Matthias Jentsch, Eion Robb 2014-2015
 
+; Script based on the Skype4Pidgin and Off-the-Record Messaging NSI files
 
 SetCompress off