A<unk><unk>  (CC)<unk>  is one of several public copyright<unk> s that enable the free distribution of an otherwise copyrighted "work".
A CC<unk>  is used when an author wants to give other people the right to share, use, and build upon a work that they (the author) have created. CC provides an author flexibility (for example, they might choose to allow only non-commercial uses of a given work) and protects the people who use or redistribute an author's work from concerns of copyright infringement as long as they abide by the conditions that are specified in the<unk>  by which the author distributes the work.
There are several types of<unk> s. The<unk> s differ by several combinations that condition the terms of distribution. They were initially released on December 16, 2002 by<unk><unk> , a U.S. non-profit corporation founded in 2001. There have also been five versions of the suite of<unk> s, numbered 1.0 through 4.0. Released in November 2013, the 4.0<unk>  suite is the most current.
In October 2014, the Open Knowledge Foundation approved the<unk><unk>  CC BY, CC BY-SA and CC0<unk> s as conformant with the "Open Definition" for content and data.
Creative Commons license
Repugnant market
Scientific consensus
User contributions
Chain of survival
Evidence based practice
Evidence-based medicine
International Nonproprietary Name