eldavojohn writes "If you pick up your copy of Guitar Hero and read the literature, you'll notice it says 'patent pending' and cites a number of patents. A group alleges no such patent pends nor are some of the patents applicable. If a judge finds Activision guilty of misleading the public in this manner, they could become liable for up to $500 per product sold under false patent marking. The patents in question seem to be legitimately Guitar Hero-oriented, and little is to be found about the mysterious group. The final piece of the puzzle puts the filing in Texas Northern District Court, which might be close enough to Texas Eastern District Court to write this off as a new kind of 'false patent marking troll' targeting big fish with deep coffers."