sentences:  Activision, through John Devecka, owns all of Devecka Enterprises' US and international patents that deal with music games.All patents issued by the USPTO are presumed valid.In February 2010, Activision was sued by the Patent Compliance Group (PCG) for releasing "Guitar Hero" products with false patent claims, with the PCG asserting that games like "Guitar Hero 5" and "Band Hero" were marked with up to 10 patents that are not used within the games along with several other improper patent pending claims.