A free software license is a software license which grants recipients extensive rights to modify and redistribute, which would otherwise be prohibited by copyright law. To qualify as a free software license, the license must grant the rights described in The Free Software Definition or one of the similar definitions based on this.
Read more about Free Software License: History, FSF-approved "free Software" Licenses, OSI-approved "open Source" Licenses, Accepted Restrictions, Permissive Versus Copyleft Opinions, Debian, Controversial Borderline Cases
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