Actually, the most amusing thing about the DMCA is that you are still entitled to make a single backup copy of any software, movies, etc. that you legally own. But the DMCA forbids you to circumvent the copy protection, so any legal backup you make will be entirely useless. Basically they're saying, "oh yes, you're allowed to make a backup copy. You just aren't allowed to make, distribute, or use any tools that make backups."