Template:GPL

''This file is free; 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 work 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.''

GNU Free Documentation License
The GNU General Public License (GNU GPL or GPL) is the most widely used license, which guarantees end users (individuals, organizations, companies) the freedoms to use, study, share (copy), and modify the work. The GPL grants the recipients of source code the rights of the Free Software Definition. The GPL is a copyleft license, which means that derived works can only be distributed under the same license terms, even when the work is changed or added to.

Usage
To provide attribution use