A firm named Rovi Corp has filed a complaint with the U.S. District court of Delaware alleging that Hulu infringes on one of its patents. Rovi Corp is not often in the headlines but its client list sports names of big hitter tech firms. Reuters said that Rovi licenses technology to Apple, Comcast and Microsoft and is even used to support the back-end of BlockBuster’s On Demand service and Best Buy’s CinemaNow. Hulu was put up for sale on June 24th and a number of companies are rumored to have been considering a bid on the streaming media company, including Apple. Hulu has yet to comment on the lawsuit.