A&M Records, Inc, et al.. v. Napster, Inc.
239 F.3d 1004 (2001)
Napster was a peer-to-peer (P2P) service that allowed its members to download files, primarily music, from each other through a central server that indexed the users’ files. The four big record companies, BMI, Warner, Universal, and Sony and their subsidiaries, filed suit under “A&M Records” to place a preliminary injunction on the service to stop their music from being infringed upon. The record companies accused Napster of contributory and vicarious infringement. The United States District Court for the Northern District of California agreed with the record companies and placed an injunction on Napster, ordering them to create a new plan to stop infringement. Napster appealed to the United States Court of Appeals, who agreed with the lower court and held the ruling. Napster had to reform their service to prevent infringement from happening, with help from the record companies.