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Full copyleft exists when all parts of a work (except the license itself) may only be modified and distributed under the terms of the work's copyleft license. Partial copyleft, by contrast, exempts some parts of the work from the copyleft provisions, permitting distribution of some modifications under terms other than the copyleft license, or ...
The FSF recommends at least "Compatible with GPL" and preferably copyleft. The OSI recommends a mix of permissive and copyleft licenses, the Apache License 2.0, 2- & 3-clause BSD license, GPL, LGPL, MIT license, MPL 2.0, CDDL and EPL.
"Full" and "partial" copyleft relate to another issue: Full copyleft exists when all parts of a work (except the license itself) may only be modified and distributed under the terms of the work's copyleft license. Partial copyleft exempts some parts of the work from the copyleft provisions, thus permitting distribution of some modifications ...
SA (share-alike): restriction on freedoms 2 or 3, the copy must distributed under a license identical to the license that governs the original work (see copyleft). ND (Non-derivative): exclusion of freedom 3. NC (Non-commercial): partial exclusion of freedoms 2 and 3 of commercial purposes. Other: other less usual restrictions on "open licenses".
The GNU General Public Licenses (GNU GPL, or simply GPL) are a series of widely used free software licenses, or copyleft licenses, that guarantee end users the freedoms to run, study, share, or modify the software. [7] The GPL was the first copyleft license available for general use.
The Apple Public Source License (APSL) is the open-source and free software license under which Apple's Darwin operating system was released in 2000. A free and open-source software license was voluntarily adopted to further involve the community from which much of Darwin originated.
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In the mid-1980s, the GNU project produced copyleft free-software licenses for each of its software packages. An early such license (the "GNU Emacs Copying Permission Notice") was used for GNU Emacs in 1985, [5] which was revised into the "GNU Emacs General Public License" in late 1985, and clarified in March 1987 and February 1988.