All Aspect Warfare developer blog #14 - The DRM Minefield.
The key to DRM for developers/publishers is that the longer it takes for hackers to break the game, the more chances you have of actually making some additional money on the game. There is no such thing as a casual pirate anymore. At least not since everyone discovered the Internet and Google. So DRM implementation is not about preventing uncle Tom from making a copy of your game for your cousin Harry. Tom doesn’t need to crack your game in order to make that copy for Harry when he can just go online and get it from someone who already has done the job for him. Heck, Harry can probably do it all by himself. Casual piracy is no farther than a trip to a search engine.