MGM Studios, Inc. v. Grokster, Ltd., 545 U.S. 913 (2005), is a United States Supreme Court decision in which the Court unanimously held that defendant peer-to-peer file sharing companies Grokster and Streamcast (maker of Morpheus) could be sued for inducing copyright infringement for acts taken in the course of marketing file sharing software. The plaintiffs were a consortium of 28 of the largest entertainment companies (led by Metro-Goldwyn-Mayer studios).