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The strength of the copyleft license governing a work is determined by the extent to which its provisions can be imposed on all kinds of derivative works. Thus, the term "weak copyleft" refers to licenses where not all derivative works inherit the copyleft license; whether a derivative work inherits or not often depends on how it was derived.
Attribution To re-distribute text on Wikipedia in any form, provide credit to the authors either by including a) a hyperlink (where possible) or URL to the page or pages you are re-using, b) a hyperlink (where possible) or URL to an alternative, stable online copy which is freely accessible, which conforms with the license, and which provides credit to the authors in a manner equivalent to the ...
Wikipedia uses grants free access to our text in the same sense as free software is licensed freely. This principle is known as copyleft.Wikipedia content can be copied, modified, and redistributed so long as the new version grants the same freedoms to others and acknowledges the authors of the Wikipedia article used.
Wikipedia:Non-free content is an evolving page offering more specific guidance about what is likely to be fair use in the Wikipedia articles and what Wikipedia policy will accept, with examples. In general, the educational and transformative nature of Wikipedia articles provides an excellent fair use case for anyone reproducing an article.
Note: this category differs substantially from Category:Free and open-source software licenses in that it is not limited to software, and not all free software licenses are copyleft (some are permissive, like those of BSD and MIT).
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.
Copyleft or libre share-alike licenses are the largest subcategory of share-alike licenses. They include both free content licenses like Creative Commons Attribution-ShareAlike and free software licenses like the GNU General Public License .
Further refinements to these definitions have resulted in categories such as copyleft and permissive. Common examples of free licenses are the GNU General Public License , BSD licenses and some Creative Commons licenses .