EDIT: The retail version is a Steam install, and there is a GOG code for a DRM free version.
No. It comes with a GOG key (as a digital backup) and a Steam key (only required if you want to use the Steamworks lobby/leaderboard). You do not need either key.
The retail version does not need to be activated, but there will be a patch to include updates made after it went gold.
Last edited by Raze; 07/08/13 07:15 AM.