Square Enix has issued a subpoena for information from Valve after a group of unknown Italian individuals stole and leaked a preview build of Deus Ex: Human Revolution. Square Enix has filed a lawsuit against the culprits and is claiming direct, contributory, and vicarious copyright infringement.
Deus Ex: Human Revolution is Square Enix's massive new role playing game releasing for the Xbox 360, PlayStation 3, and PC on August 23.
Basically, Square Enix arranged for specific members of the video game press to preview Deus Ex: HR via download through Steam, Valve's digital distribution service. On May 31 SE found a leaked copy of the preview on BitTorrent, a peer-to-peer file transfer service, which they found lead back to Italian magazine, GMC's Steam account. Valve apparently has the hardware ID number of the computer that was used to access the game code and is saying that the code doesn't match the one which was used by the authorized GMC journalist.