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The concrete effect of strong vs. weak copyleft has yet to be tested in court. [26] Free-software licenses that use "weak" copyleft include the GNU Lesser General Public License and the Mozilla Public License. The GNU General Public License is an example of a license implementing strong copyleft.
Where copylefted art has a large audience of modest means or a small audience of considerable wealth, the act of releasing the art may be offered for sale. See Street Performer Protocol . This approach can be used for the release of new works, or can be used to relicense propriertary works as copylefted works, e.g. Blender .
For this reason some copyleft licenses are also known as reciprocal licenses, they have also been described as "viral" due to their self-perpetuating terms. [4] Under fair use, however, the copyleft license may be superseded, just like regular copyrights. Therefore, any person utilizing a copyleft-licensed source for their own work is free to ...
Copyleft licenses (also known as "share-alike"), [46] require source code to be distributed with software and require the source code be made available under a similar license. [48] [49] Copyleft represents the farthest that reuse can be restricted while still being considered free software. [50]
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".
Copyleft software licenses (24 P) Creative Commons (5 C, 32 P, 1 F) M. Music licensing (1 C, 17 P) O. ... The Artist's Reserved Rights Transfer and Sale Agreement; C.
The strong copyleft GPL is written to prevent distribution within proprietary software. [115] [116] Weak copyleft licenses impose specific requirements on derivative works that may allow the covered code to be distributed within proprietary software in certain circumstances. [77]
Design Science License (DSL) is a copyleft license for any type of free content such as text, images, music. Unlike other open source licenses, the DSL was intended to be used on any type of copyrightable work, including documentation and source code. It was the first “generalized copyleft” license. The DSL was written by Michael Stutz. [1]