I have always been against copy protection. Normally it just hurts your legal customers. Since the Sony Root Kit farce I have been very careful about all software and music I have purchased and normally avoid any DRM infected product. I have not purchased ANYTHING from Sony since the Root Kit story broke.
Because of the way companies have used DRM in the past it has reached the point where DRM on a product can cause a serious consumer backlash. The heavy DRM in the EA release of Spore caused a very public outcry where thousands of people gave the game a 1 star rating on Amazon because of the DRM. The publicity was enough to force EA games to back down and ease the DRM.
So is there such a thing as good DRM? The short answer to the question is Yes although I know I need to back this up.
The first example of good DRM is the Steam distribution system from Valve. The original version of Steam was developed to protect the release of Half Life 2 and was not popular with gamers due to the constant online authentication it required. Since then Valve has listened to gamers and have polished Steam into a games distribution system that is hard not to like. It keeps games patched automatically, find your friends online and provides a simple way to try, purchase and then download games.
The other example of good DRM is the system used to protect the hardcore online racing simulation called Live For Speed. To use LFS online, even in demo mode, you have to create an account. Your account is used to hold statistics about every race you have taken part in but is also used to hold information about which content you have purchased and hence have access to. Whenever you install or upgrade the game you have to activate the game again or you revert to demo mode. You account starts with 3 available activations. You lose one activation every time you (re)activate you simulator but you also gain one back each week until you reach the max of 3 again.
DRM does not have to be the over zealous nightmare that big content would like to push on us. It should not force you to have the original disk in the drive or look up word x of page y in the manual every time you want to use it . You should be able to make backup copies as required.
If DRM on a product does limit your freedom then take it back and get your money back. No DRM is the best solution but if you must use DRM thik about your users needs ABOVE your desire to fight piracy.