Konami has filed a lawsuit against Harmonix, MTV and Viacom, claiming music game Rock Band infringes on its patents.
As reported by Bloomberg, Konami is referring to patents issued in 2002 and 2003. These refer to a "musical rhythm-matching game" and musical instrument peripherals.
Konami wants cash compensation, plus an order preventing Viacom and Harmonix from "using its inventions", as the article puts it. The companies named in the suit have yet to comment.
Meanwhile, Konami is working on Rock Revolution - a peripheral-based music game in development for PS3, Xbox 360, Wii and DS. As reported in May, it'll come with a guitar and drum kit, and according to Bloomberg will be out later this year.