Windows Vista contains protection mechanisms for “premium content” (HD DVD’s, Super Audio CD’s, etc.) that render such content inaccessible in their HD forms.
Don’t get me wrong: I like Vista. Not so much that I am going to actually acquire it, but I’ve used it and it has some nice UI enhancements.
The Premium Content Protection in Vista may be a strategic mistake on Microsoft’s part. There is an excellent paper on this, here: