Bruce Schneier has written an informative article
for Forbes titled "Why Vista's DRM Is Bad For You". It begins thusly:
Windows Vista includes an array of "features" that you don't want. These features will make your computer less reliable and less secure. They'll make your computer less stable and run slower. They will cause technical support problems. They may even require you to upgrade some of your peripheral hardware and existing software. And these features won't do anything useful. In fact, they're working against you. They're digital rights management (DRM) features built into Vista at the behest of the entertainment industry.
Definitely worth a read if you're thinking about "upgrading" to Vista. The article is also available on his website
Oh yeh, and the word on the street
is that the processing keys for Blu-Ray and HD-DVD have been found, which seems to indicate the copy protection on these formats has been smashed.