Copyright Basics- Fair Use - Alternatives to Copyright - Creative Commons is a nonprofit organization working to increase the amount of creativity (cultural, educational, and scientific content) in “the commons” — the body of work that is available to the public for free and legal sharing, use, repurposing, and remixing.
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"Get Creative" about the concept of "creative commons."
Copyleft - GNU license information 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.