The fair use doctrine permits certain uses of copyrighted material that are unauthorized by the copyright holder. In 1984, the Supreme Court decided in Sony v. Universal Studios (Sony) that unauthorized home taping of television programs was a fair use of such programs. Decried by the dissent...

The fair use defense in copyright law shields an intellectual commons of protected uses of copyrighted material from infringement actions. In determining whether a given use is fair, courts must assess the new use's potential effect on the market for the copyrighted work. Fair use jurisprudence...