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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]
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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.
License compatibility is a legal framework that allows for pieces of software with different software licenses to be distributed together. The need for such a framework arises because the different licenses can contain contradictory requirements, rendering it impossible to legally combine source code from separately-licensed software in order to create and publish a new program.
Openlaw is a project at the Berkman Klein Center for Internet & Society at Harvard Law School aimed at releasing case arguments under a copyleft license, in order to encourage public suggestions for improvement.
The Reciprocal Public License (RPL) is a copyleft software license released in 2001. [2] Version 1.5 of the license was published on July 15, 2007, [ 3 ] and was approved by the Open Source Initiative as an open-source license .