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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.
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 [4] Under fair use, however, the copyleft license may be superseded, just like regular copyrights.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 ...
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 .
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, and/or modify the software. [7] The GPL was the first copyleft license available for general use.
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 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]
This is an accepted version of this page This is the latest accepted revision, reviewed on 18 December 2024. Classified advertisements website Craigslist Inc. Logo used since 1995 Screenshot of the main page on January 26, 2008 Type of business Private Type of site Classifieds, forums Available in English, French, German, Dutch, Spanish, Italian, Portuguese Founded 1995 ; 29 years ago (1995 ...
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