NBC Universal has joined Viacom in filing a piracy-related court statement regarding YouTube, reports Reuters.

The media giants submitted a friend of the court briefing in a case pitting YouTube against owners of the footage of trucker Reginald Denny being beaten during the Los Angeles riots of 1992. Los Angeles News Service, which owns the footage, decided to sue YouTube when the video appeared on the popular video-sharing site.

The brief alleges YouTube engages in practice that violate the rights of copyright holders. Media companies also argue YouTube manipulates videos to encourage illegal dissemination.

NBC is currently taking part in a test of YouTube' copyright monitoring system.