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Copyleft

http://en.wikipedia.org/wiki/Copyleft

http://www.gnu.org/copyleft/

Copyleft 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

Copyleft 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 copyleft symbol is a backwards C in a circle (copyright symbol mirrored) it is also good to note that it has no legal meaning .

Instead of allowing a work to fall completely into the public domain (where no ownership of copyright is claimed), copyleft allows an author to impose some restrictions on those who want to engage in activities that would more usually be reserved by the copyright holder

An early example of copyleft was the Tiny BASIC project started in the newsletter of the People's Computer Company in 1975. Dennis Allison wrote a specification for a simple version of the BASIC programming language. This design did not support text strings and only used integer arithmetic. The goal was for the program to fit in 2 to 3 kilobytes of memory.

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