In the suit, Activision claims that Worlds has infringed, and continues to infringe, U.S. Patent No. 6,014,145 entitled "Navigation with optimum viewpoints in three-dimensional workspace interactive displays having three-dimensional objects with collision barriers" and U.S. Patent No. 5,883,628 entitled "Climability: property for objects in 3-D virtual environments." The contested product is software distributed by Worlds called "Worlds Player."
Worlds Inc. filed a patent infringement lawsuit against Activision Blizzard, Inc., Blizzard Entertainment, Inc. and Activision Publishing, Inc. on March 30, 2012. That lawsuit is pending in the U.S. District Court for the District of Massachusetts.