Copyright: is a legal concept, enacted by most governments, giving the creator of an original work exclusive rights to it, usually for a limited time.
Copyleft: is a play on the word copyright to describe the practice of using copyright law to offer the right to distribute copies and modified versions of a work and requiring that the same rights be preserved in modified versions of the work.
Public Domain: states that it refers to works which are intangible to private ownership or are available for public use.
Creative Common: Creative Commons licenses do not replace copyright, but are based upon it. They replace individual negotiations for specific rights between copyright owner (licensor) and licensee, which are necessary under an "all rights reserved" copyright management with a "some rights reserved" management employing standardized licenses for re-use cases where no commercial compensation is sought by the copyright owner.
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