Cox Communications, Inc. v. Sony Music Entertainment, 607 U.S. ___ (2026), was a United States Supreme Court case regarding the liability of an internet service provider for its subscribers engaging in copyright infringement.
Cox Communications was sued by multiple music labels for lax enforcement of its users engaged in sharing the labels' copyrighted music, arguing Cox financially benefited from these users. A jury trial found Cox to be liable. On appeal to the Fourth Circuit, the court dismissed findings that Cox engaged in vicarious infringement, but held that Cox was still liable for contributory infringement, with Cox potentially owing several million dollars to the labels.
In a 9-0 decision split among the opinions, the Supreme Court found that Cox Communications was not contributorily liable for the actions of its users, reversing the Fourth Circuit's decision.
Background
Music piracy became a significant issue for the music industry with widespread adoption of the Internet. Initial attempts to sue services that enabled copyright infringement such as Napster were successful, but as new methods of anonymous sharing were introduced by the mid-2010s, the primary means that music publishers have used to fight such piracy is to directly sue the users, rather than the internet service providers (ISPs) that provide the users' services. This can be difficult due to the anonymity which the Internet Protocol (IP) system allows, particularly with peer-to-peer sharing clients, as well as the large number of users that the labels claim were illegally sharing music. To help fight such copyright infringement at this scale, a clause of the