This manual is free documentation: you can redistribute it and/or modify it under the terms of either (i) the CC-BY-SA license as published by Creative Commons (either version 3 of the License, or (at your option) any later version) or (ii) 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) or (iii) both in parallel.
This document 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.
Details of the licenses are available at http://creativecommons.org/licenses/by-sa/3.0/ and http://www.gnu.org/licenses/old-licenses/gpl-2.0.html. The sources used to create this document are available at http://code.google.com/p/texworks/.