- **Epistemic status:** #budding Copyleft is a methodology of making a piece of work like software and any modified versions or derivatives to be free (free as in freedom, not “zero price”) and publicly available as well, carrying the same license. Copyleft is not copyright free, but use the copyright to add terms giving the rights for everyone to use, modify, and redistribute the source code. The copyleft software licenses generally are perceived protective, in contrast with permissive free software licenses like MIT. The first copyleft license with extended use is the GNU General Public License (GPL) written by Richard Stallman. Other notable mentions are the Mozilla Public License, Free Arts License, and Creative commons share-alike license conditions. --- ## References - “Copyleft.” In _Wikipedia_, June 30, 2022. <https://en.wikipedia.org/w/index.php?title=Copyleft&oldid=1095721232>. - “What Is Copyleft? - GNU Project - Free Software Foundation.” Accessed June 30, 2022. <https://www.gnu.org/licenses/copyleft.en.html>.