Metro-Goldwyn-Mayer Studios Inc. v. Grokster, Ltd., 545 U.S. 913, 125 S. Ct. 2764, 162 L. Ed. 2d 781 (2005)

Songwriters, music publishers, and motion studios brought copyright infringement action against distributors of a P2P file sharing computer networking software. The Supreme Court held that one who distributes a device with the object of promoting its use to infringe copyright, as shown by clear expression or other affirmative steps taken to foster infringement, is liable for the resulting acts of infringement by third parties.