digital rights management, it protects high quality and subscription DVDs and video streams.
its insane. if a content owner (such as Universal Studios, or Disney etc, etc) wants to they can have Vista turn off your display adapter to prevent someone from emulating a hardware device and recording the DVD or stream
they can also limit the HDDVD or Blu-Ray DVD resolution by going through a resolution downgrader followed by an upgrader so that HD DVD or Blu-Ray DVD or a HD stream will appear fuzzy and will not be the high def content you paid for.
MS has turned into the best friend of the RIAA.
http://www.microsoft.com/whdc/device...t_protect.mspx
http://www.twit.tv/sn75
http://www.cs.auckland.ac.nz/~pgut00...ista_cost.html