GNU Free Documentation License

The GNU Free Documentation License ( GNU FDL or simply GFDL ) is a copyleft license for free documentation, designed by the Free Software Foundation (FSF) for the GNU Project . It is similar to the GNU General Public License , giving readers the rights to copy, redistribute, and modify (only when without “invariant sections” restrictions). Copies may also be sold commercially, but if produced in larger quantities, the original document or …

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