Copyleft
Copyleft
Copyleft (/ˈkoʊpiˌlɛft/) is a general method for making a program or other work free, and requiring all modified and extended versions of the program to be free as well. The name is a play on the word copyright and is a form of licensing and can be used to maintain copyright conditions for works such as computer software, documents, music and art.
Etymology
The term copyleft comes from the phrase "turning copyright on its head", since it uses copyright law to achieve the opposite of its usual purpose: instead of imposing restrictions, it grants rights to other people, in a way that ensures the rights cannot subsequently be taken away. It was first used by Richard Stallman in 1985.
Related Terms
- Free Software: Software that is free to use, modify, and distribute.
- Open Source Software: Software that is released with a source code that anyone can inspect, modify, and enhance.
- GNU General Public License: The most widely used free software license, which guarantees end users the freedom to run, study, share, and modify the software.
- Creative Commons: Non-profit organization that provides an easy way to license the works of creativity.
- Public Domain: The state of belonging or being available to the public as a whole, and therefore not subject to copyright.
External links
- Medical encyclopedia article on Copyleft
- Wikipedia's article - Copyleft
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