The comic xkcd makes the point that when you “buy” DRM’d software, music or movies that you’re really at the mercy of the company who controls the DRM and they can effectively revoke your access for any reason just as Walmart threatened to do recently. Of course, once the company locks you out of the content you paid for you either have to pay for it again or break the law by bypassing the DRM. Hence, you’re probably better off pirating the software, music or movie in the first place- if you’re going to break the law there really isn’t any point paying for it in the first place since laws like the DMCA don’t care if you paid for it or not.