Worlds Inc. owns US patents numbers 8,082,501, 7,493,558, 7,945,856 and 7,181,690 titled “System and Method for Enabling Users to Interact in a Virtual Space” and has additional continuation claims in process before the U.S Patent & Trademark Office (USPTO). These patents relate to computer architecture for three-dimensional graphical multi-user interactive virtual world systems. Such systems are utilized in Massive Multi-Player Online Role-Playing Games (MMORPG).

via Worlds Inc. Files Patent Infringement Lawsuit Against Activision Blizzard, Inc., Blizzard Entertainment, Inc., and Activision Publishing, Inc. – MarketWatch.