In December, General Patent Corp. announced it was working on behalf of Worlds.com to enforce its patents on "Scalable Virtual World Chat Client-Server System" and "System and Method for Enabling Users to Interact in a Virtual Space," which date back to 1995.
Attorney Sean Kane, writing in his "Virtual Judgment" blog, commented:
"Therefore, it would seem that General Patent Corporation and Worlds.com are taking the position that the above-referenced patents cover the idea of the computer architecture for a three-dimensional graphical multi-user interactive virtual world system. If so, this announcement is arguably a very thinly veiled notice to the virtual world industry that infringement suits are forthcoming for those companies who do not enter into a licensing deal with General Patent Corporation and Worlds.com."
http://www.linuxlinks.com/portal/news/article.php?story=20090203141036179