Ed Felten on a new Microsoft white paper describing the “output content protection” in Windows Vista:
The document reveals that movie studios will have explicit veto
power over what is included in some parts of Vista. For
example, pages 22-24 describe the “High Bandwidth Cipher” which
will be used to encrypt video data is it passes across the PC’s
internal PCIe bus. Hollywood will allow the use of the AES
cipher, but many PCs won’t be able to run AES fast enough,
leading to stutter in the video.