@Doctalen It's not there to prevent pirates from playing it ever. It's there so that paying customers won't be the last to play the game, in case of a leak. If it were there to block the pirates from playing, there would be the same necessity in the copies that are produced "after" the release as well. There is not even a serial key requirement...
The only thing that I can call "DRM" is the necessary GOG.com activation to download patches and DLCs. But that's actually not exactly DRM per se. They are giving a free GOG.com copy of the game to you, and they are trying to add value to the original copy. The base game is there to play to your heart's content, if you are pirating (I'm assuming the game itself without any patch will be playable without so many game crashing bugs). But if you own a legitimate copy, you can have software support and free DLCs.
The only thing that I can call "DRM" is the necessary GOG.com activation to download patches and DLCs. But that's actually not exactly DRM per se. They are giving a free GOG.com copy of the game to you, and they are trying to add value to the original copy. The base game is there to play to your heart's content, if you are pirating (I'm assuming the game itself without any patch will be playable without so many game crashing bugs). But if you own a legitimate copy, you can have software support and free DLCs.