A flexible set of copyright licenses that allow content creators to specify which rights they reserve and which they waive regarding their work that is supposed to codify collaborative spirit of the Internet. There are six main Creative Commons licenses based on four conditions that creators can choose to apply: Attribution, Share Alike, Non-Commercial, and No Derivative Works. The least restrictive of the licenses is Attribution, which grants anyone, from an individual to a large company, the right to distribute, display, or otherwise make use of the work so long as the creator is credited. The most restrictive is Attribution Non-Commercial No Derivatives, which grants only redistribution. First released in December 2002 by the nonprofit Creative Commons organization, which was inspired by the open source GNU GPL license, the licenses are now used on an estimated 130 million works worldwide. The glossary you are reading is released under a Creative Commons Attribution Share Alike license in an effort to encourage wide distribution and contribution. (Also see open source)