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2. Copyleft - Wikipedia

   en.wikipedia.org/wiki/Copyleft

   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.

3. Free-software license - Wikipedia

   en.wikipedia.org/wiki/Free-software_license

   In the mid-1980s, the GNU project produced copyleft free-software licenses for each of its software packages. An early such license (the "GNU Emacs Copying Permission Notice") was used for GNU Emacs in 1985, [5] which was revised into the "GNU Emacs General Public License" in late 1985, and clarified in March 1987 and February 1988.

4. Comparison of free and open-source software licenses

   en.wikipedia.org/wiki/Comparison_of_free_and...

   There are licenses accepted by the OSI which are not free as per the Free Software Definition. The Open Source Definition allows for further restrictions like price, type of contribution and origin of the contribution, e.g. the case of the NASA Open Source Agreement, which requires the code to be "original" work.

5. Wikipedia : WikiProject WikiFundi Content/copyleft

   en.wikipedia.org/.../copyleft

   The most well known free software license that uses strong copyleft is the GNU General Public License. Free software licenses that use "weak" copyleft include the GNU Lesser General Public License and the Mozilla Public License. Examples of non-copyleft free software licenses include the X11 license, Apache license and the BSD licenses. The ...

6. Software license - Wikipedia

   en.wikipedia.org/wiki/Software_license

   [48] [49] Copyleft represents the farthest that reuse can be restricted while still being considered free software. [50] Strong copyleft licenses, such as the GNU General Public License (GPL), allow for no reuse in proprietary software, while weak copyleft, such as the related GNU Lesser General Public License (LGPL), do allow reuse in some ...

7. GNU General Public License - Wikipedia

   en.wikipedia.org/wiki/GNU_General_Public_License

   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.