Vista will be infested with DRM, this was everywhere today. Another news is that Intel based Macs will have TPM chips…
DRM is any technology which protects interests of big companies against little people like you and me, by treating us as thieves. The best part (of course for the big companies; DRM has virtually no benefit for the user) is that we pay any additional price and we are inconvenienced.
TCP is another technology which makes DRM implementation more possible by taking away users privacy (pretending that this is for the users security).
(Disclaimer: the above are my personal definitions. Read more about TCP here).