A&M Records v. Napster (2001)
Napster let millions share MP3 files peer-to-peer, both uploading and downloading copyrighted songs. The Ninth Circuit held Napster liable for contributory and vicarious infringement, rejecting the fair-use defense Napster raised for its users.
Napster shut down and settled with record labels, paying millions in damages.
The ruling established that platforms enabling file sharing can be liable even when they don't host files, drawing a line between private copying and public distribution.
Meta's torrenting involves the same uploading (seeding) versus downloading distinction the Napster court weighed, and contributory infringement is the claim authors now press against Meta.
