+Copyleft is a legal framework ensuring that creative works, once made free, remain free for all to use, modify, and distribute. It champions user freedoms, a core tenet of the [Free Software](/wiki/free_software) movement, by requiring that derivative works carry the same [Licensing](/wiki/licensing) terms.
+## See also
+- [Open Source](/wiki/open_source)
+- [Copyright](/wiki/copyright)
+- [Permissive License](/wiki/permissive_license)
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