Universal Music Group is suing MySpace - claiming the online social network site is encouraging its users to illegally share music and music videos.
It accuses MySpace of allowing people to illegally upload videos and of providing the technology for users to share the content with others.
Links to work by its artists including The Killers, Jay-Z and Gwen Stefani are available, Universal alleges.
But MySpace said it acted legally and dismissed the "meritless litigation".
It added that its procedures for removing illegal downloads were good, and that it fully complied with copyright laws.
another day another court case.