Worlds.com filed suit against NCSoft for copyright infringement on Christmas Eve. Two patents filed in 2000 by Worlds.com involving scalable chat and enabling users to interact with each other in virtual space are all infringed upon by NCSoft's games(Including City of Heroes, Aion, Tabula Rasa, Guild Wars, etc).
Update I emailed Worlds.com for an interview about the lawsuit, however so far I've been given no response.
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