It never ceases to amaze me that people think Microsoft is trying to take over the world with Palladium. Sure, being able to charge you 25 cents every time you make a copy of your own files would be great for our bottom line. But that's just additional marginal income to us.
The real reason is to prevent leaks of internal documents, memos, and motivational videos, like this one. A parody of The Boss was probably just not a good idea, but hey, it was a better idea than Vista itself. We've got a sales force to motivate.