Gtk2-Ex-Xor is Copyright 2007, 2008, 2009, 2010, 2011 Kevin Ryde Gtk2-Ex-Xor is licensed under the GNU Public License GPL version 3 (or at your option any later version). The complete text of GPL version 3 is in the file /usr/share/common-licenses/GPL-3 Program home page: http://user42.tuxfamily.org/gtk2-ex-xor/index.html