9 Months Ago, Slashdot says (in Worlds.com To Extend Virtual World Lawsuit To Second Life, WoW) CrunchGear
NCsoft has infringed on patent 7181690, "System and Method for Enabling Users to Interact in a Virtual Space" through its games, including City of Heroes, City of Villains, Dungeon Runners, Exteel, Guild Wars, Lineage, Lineage II, and Tabula Rasa. ...

11 Months Ago, ag-IP-news Agency says (in Worlds.com Sues NCSoft for Infringing Key Virtual Worlds Patent)  Jordan - Jan 2, 2009
NCSoft Corp., a game developer with US offices in Austin, TX, is the purveyor of such games as City of Heroes, Guild Wars, Tabula Rasa, Lineage, ...

And American Digital Networks says (in Worlds.com Sues NCSoft for Infringing Key Virtual Worlds Patent - American Digital Networks) Worlds.com Sues NCSoft for Infringing Key Virtual Worlds Patent
press release), MD - Dec 31, 2008
NCSoft Corp., a game developer with US offices in Austin, TX, is the purveyor of such games as City of Heroes, Guild Wars, Tabula Rasa, Lineage, ...

And SYS-CON Media says (in Worlds.com Sues NCSoft for Infringing Key Virtual Worlds Patent)  NJ -
NCSoft Corp., a game developer with US offices in Austin, TX, is the purveyor of such games as City of Heroes, Guild Wars, Tabula Rasa, Lineage, ...

13 Months Ago, ITWeb says (in World of Warcraft expansion unveiled)  South Africa - Nov 18, 2008
While sudden, his exit from NCsoft was not totally unexpected. Despite six years of costly development, Tabula Rasa failed to achieve critical mass, ...