The best you can do is hand them those things in a form that's jumbled up, in the hope that it will be tricky to extract them all.
Of course, there are people who see that as a fun challenge. And there are more of them than there are people working for media companies. And a lot of the time, they're smarter.
A prime example of this can be seen here, where one of the original hackers behind Netscape Navigator is having fun with YouTube's latest attempts at stopping people downloading their videos. Take a look through the comments to see that within days there are multiple projects all working at breaking it, sharing their discoveries with each other.
It's doomed. It really is. And while we're stuck with it it makes life harder for paying customers (or people who would be paying, if you would sell them video files that weren't encrusted with awfulness and would thus play on whatever device they wanted it to).
Original post on Dreamwidth - there are comments there.