http://www.gossipgamers.com/blizzard-ca ... ng-battle/
Rather interesting take on DRM. One of the co founders considers it a losing battle. Instead of using DRM, they have battle.net and want to use that to entice people to get legit copies to play their games there due to the additional features. It's not a bad approach. Certainly better than the dribble I've seen other companies do.