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GNU Free Documentation LicenseA copyleft license for free content, designed by the Free Software Foundation (FSF) for the GNU Manifesto explains the details. In legal terms, GNU software is protected by the GNU General Public License, or GPL, and by the GNU Lesser General Public License, or LGPL. The Linux kernel, which is subject to the GPL, benefits from this project (especially from the tools), but should not be seen as the same thing.">GNU project. The current state of the license is version 1.2, the official text of which can be found at http://en.wikipedia.org/wiki/GNU_Free_Documentation_License The license was designed for manuals, textbooks, and other reference and instructional materials. However, it can be used for any text-based work, regardless of subject matter. It stipulates that any copy of the material, even if modified, carry the same license. Those copies may be sold but, if produced in quantity, have to be made available in a format which facilitates further editing.