The marketing people babble on about how Digital Rights Management "enhances" your "enjoyment" of a product. But what copy control really does is make ripped-off stuff better than the legal version. The most obvious example of this is the difference between illegally downloaded movies and commercial DVDs. To view a downloaded movie, you just double-click it. And then you're watching it.
Stick a recent commercial DVD into your player, though, and you'll probably have to sit through lengthy, un-skippable warnings about how dastardly is the piracy which you did not just engage. And that's before you even get to the annoying menus, trailers, and other dross that stand between you and the movie for which you, one might start to think foolishly, paid.
Legally purchased copy-protected game discs are another great example. They can't be backed up - literally, not just legally. The copy-protection generally makes the game discs uncopyable by all but very expert users. But you can make copies of the cracked version of the same game on The Pirate Bay, to save you from having to download it again if something goes wrong, with no trouble at all.
And legitimate Windows users enjoy the "Genuine Advantage" of having to validate their OS online or over the phone. Meanwhile, Captain Hook just downloads the fully patched and polished Corporate Edition, which doesn't even need a CD key, for free.
It is, of course, about control. Companies that sell software desperately want control. But the amusing irony is, the harder they grab, the more they strangle their users, and the more people turn away from their products. If they could just let go and relax a little... ha, yeah RIGHT!