The license of the TV Tropes wiki used to be Creative Commons Attribution-ShareAlike (CC BY-SA), a license for free cultural works. But in July 2012, TV Tropes unilaterally changed its license to the Creative Commons Attribution-NonCommercial-ShareAlike (CC BY-NC-SA), which is non-free. Since then, TV Tropes has been infringing the copyright of its pre-July 2012 contributors, who had contributed their work under CC BY-SA, by distributing it under a license that does not grant downstream users the rights that CC BY-SA guarantees. In November 2013, TV Tropes began to hide this infringement by changing its "welcome" page and editing form to require assignment of copyright in all contributions, an unusual policy for a wiki. The article "The Edge of the Creative Commons" explains the dangers of this in more detail.
Fortunately, some time in June 2012, a copy of the last clearly CC BY-SA version of TV Tropes was saved. It is called All the Tropes. By the end of 2014, trope links from articles on Pin Eight wiki are expected to be migrated to point at All the Tropes.
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