+The **GPL** (GNU General Public License) is a foundational [Free Software](/wiki/Free_Software) license. It ensures users the freedom to run, study, share, and modify software, requiring these liberties extend to all derived works, thus upholding [Open Source](/wiki/Open_Source) principles.
+## See also
+- [Copyleft](/wiki/Copyleft)
+- [Software License](/wiki/Software_License)
+- [Richard Stallman](/wiki/Richard_Stallman)
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