Comparison To Copyleft
Further information: CopyleftCopyleft is "a general method for making a program or other work free, and requiring all modified and extended versions of the program to be free as well." By comparison with permissive licences, copyleft licensing places more requirement in terms of distribution and combination with software under other licences.
Read more about this topic: Permissive Free Software Licence
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“Intolerance respecting other people’s religion is toleration itself in comparison with intolerance respecting other people’s art.”
—Wallace Stevens (1879–1955)