"According to statements by Alexander Poltorak, General Patent Corporation’s Chairman and CEO, “[t]he Worlds patents represent exceptionally valuable intellectual property,” and “[w]e welcome licensing inquiries from the on-line game industry. Non-exclusive licenses are available on favorable and non-discriminatory terms.” Worlds.com holds U.S. Patent Nos. 6,219,045 entitled “Scalable Virtual World Chat Client-Server System” and 7,181,690 titled “System and Method for Enabling Users to Interact in a Virtual Space”."
Source: http://www.virtualjudgment.com/index.php?option=com_mojo&Itemid=26&p=20


