According to the latest litigation hurled at the folks in Cupertino, a New Jersey based company called Multi-Format Inc. says that the way in which Apple delivers digital content (movies, TV shows, and any video segments) through iTunes directly violates a patent held by the people at Multi-Format Inc.
More specifically, the East Coast company in question secured ownership of a patent some seven years ago - "Multi-format audio/video production system" - and, based on the language of the lawsuit filed, the iTunes store and any device that secures digital video content from it, are in direct violation of close to two dozen claims within the aforementioned patent.