Yesterday we reported that Square Enix had filed a lawsuit against unnamed Italian citizens who (they allege) stole a preview build of Deus Ex: Human Revolution (see this story). The latest wrinkle in the story is that the company wants Valve Software to help them because the stolen build was a copy that was hosted on Valve's Steam service.
For its part, Valve says that it has plenty of information on those individuals responsible for stealing and leaking the file onto the internet, but it is unable to give that information to Square Enix without them presenting Valve with a court ordered subpoena.
It may seem like an odd position for Valve to take with a publishing partner, but the company is simply protecting itself and following procedure.
We'll let you know how this situation plays out.