DRM, or digital rights management, sucks. I have no idea why companies continue to insist on implementing half-ass solutions that do nothing to prevent piracy and do everything to prevent people who want to legitimately use their product from doing so.
I got Hairspray from my Blockbuster Online account. I actually have packed up most of my stuff already, so I don't really have a good place to watch the movie other than on my computer. So I popped the DVD in my computer, and started up my Media Center. Of course, my computer is having problems reading the stupid DVD because New Line had decided to put some Anti-Piracy measures on the DVD to ensure people don't try and steal this movie. These types of measures generally make it more difficult for computers to read the data because this is where pirates are going to try and rip the movie off of. It is supposed to work for legitimate uses, like paying in my media center, but there are always issues.
Of course, one quick search on any torrent network, and you can find copies of it. The only people this really hurts are those who just want to legitimately watch the movie. With the prevalence of media centers and people watching movies on their computer, I just don't understand why companies think this is a good idea. It does not stop piracy, it only pisses off legitimate users.