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1.
Misuse or abuse of copyright laws. Often used as a form of censorship.
Companies such as Viacom, Warner Music Group, and Toei have been accused of copywrong by angry YouTube users who just want to express themselves and showing their viewpoints.
by TucanaTheToucan October 25, 2011
 
2.
Slang term used for a copyright that no-one keeps. Often the copyright holder cannot stop the abuse or they may just choose not to.
The Amen Break is an example of copywrong material as the original author hasn't received a penny, dispite widespread use of it in popular culture.
by Deadly Headshot January 15, 2010