This work, as a whole, is licensed under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. Many files are based on sources of the Qt GUI Toolkit. Please see their headers for futher information. All contributions, either in files based on Qt or in original files, are, and are required to be, compatible with 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. Please see headers of the individual files for further information.