MysterD
Steam version has no other DRM except SecuCrap. I play it locally without internets ans Steam.
Oh, Steam's definitely a version of DRM - one of the fairer and milder ones, in most instances...as long as your offline mode works and as long as you don't get a VAC Ban, basically.

Steam doesn't contain additional Black Lists, drivers, or any of that stuff that others such as Securom, Starforce, or Tages contain.
Steam limits one game per your user name - which I think is fine and fair. Though, what makes Steam very fair is it allows you to throw a game on as many PC's as you wish - since it only cares about your unique user name/account.