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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.
Examples of non-copyleft free software licenses include the X11 license, Apache license and the BSD licenses. The Design Science License is a strong copyleft license that can apply to any work that is not software or documentation, such as art, music, sports photography, and video.
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]
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.
[15] [14] In 1980, the United States Congress added the definition of "computer program" to 17 U.S.C. § 101 and amended 17 U.S.C. § 117 to allow the owner of the program to make another copy or adaptation for use on a computer. [16] This legislation, plus court decisions such as Apple v.
Pages in category "Copyleft software licenses" The following 24 pages are in this category, out of 24 total. This list may not reflect recent changes. A.
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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]