From GamesGazette.net: "As many of the people who have Left 4 Dead will know, Valve did not include Digital Rights Management (DRM) onto the disc(s). While this is rather good given the way the DRM controversy has exploded in the wake of the Spore debacle, it doesn't mean Valve is just letting piracy happen. In fact, there is something they are doing about it that is kind of making it seem like they are conceding something to the public. That is, if you know it's going on. It's a way that really doesn't make much sense to us, though it could make sense when you think about it, because it's only happening to those that want to play multiplayer through the cracked L4D copies floating around the torrent sites. This could mean one of two things: Either they think the multiplayer is the key seller of the game (it's what's getting the game these high scores on the reviews so far), or....
....maybe even they think that the single player campaign in L4D sucks total ass."
