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2. Copyleft - Wikipedia

   en.wikipedia.org/wiki/Copyleft

   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. An even stronger copyleft license is the AGPL, which requires the publishing of the source code for software as a service use cases.

3. Free license - Wikipedia

   en.wikipedia.org/wiki/Free_license

   While the goals behind the terms are different, open-source licenses and free software licenses describe the same type of licenses. [13] The two main categories of free and open-source licenses are permissive and copyleft. [14] Both grant permission to change and distribute software. Typically, they require attribution and disclaim liability.

4. Share-alike - Wikipedia

   en.wikipedia.org/wiki/Share-alike

   They include both free content licenses like Creative Commons Attribution-ShareAlike and free software licenses like the GNU General Public License. These licenses have been described pejoratively as viral licenses , because the inclusion of copyleft material in a larger work typically requires the entire work to be made copyleft.

5. Public-domain software - Wikipedia

   en.wikipedia.org/wiki/Public-domain_software

   Copyleft free software, therefore, shares many properties with public-domain software, but does not allow relicensing or sublicensing. Unlike real public-domain software or permissive-licensed software, Stallman's copyleft license tries to enforce the free shareability of software also for the future by not allowing license changes.

6. 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.

7. Open-source license - Wikipedia

   en.wikipedia.org/wiki/Open-source_license

   Permissive licenses come from academia. Copyleft licenses come from the free software movement. Copyleft licenses require derivative works to be distributed with the source code and under a similar license. Since the mid-2000s, courts in multiple countries have upheld the terms of both types of license.