The outfit has filed a lawsuit in federal court in Chicago accusing Mike Greiling, Will Glynn and others of infringing on Tecmo's proprietary software.
The patch for the Microsoft's Xbox console removes the bikini tops of the already scantily clad players in Dead or Alive Xtreme Beach Volleyball.
Tecmo has also shut down www.ninjahacker.net which was being used to distribute the patch.
John Inada, general manager for Tecmo, said in a statement: "On behalf of the game industry, the gamers and all future innovations in gaming, the protection of intellectual property is a serious issue that affects everyone in the game industry, and can no longer be ignored."
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