Below is from an article found at Tom's Hardware...It compairs Blu-Ray vs. HD-DVD
“...In April 2005, it was announced that HD-DVD would use Advanced Access Content System (AACS), an advanced version of the CSS system that worked so wonderfully on DVD. The License Administrator is a consortium of vendors that includes Intel, IBM, Matsu****a Electric Industrial, Microsoft, Toshiba and (go figure) Sony. Warner Brothers is also a member, as is Blu-ray backer Walt Disney Co.
Dan Ramer of DVD File ran a report on a paper from a group called Independent Security Evaluators (ISE) that really sounded disturbing. ISE looked at AACS and a second form of protection for HD-DVD called Self Protecting Digital Content (SPDC), which ISE recommended be used on top of AACS.
AACS gives playback devices a set of 128-bit Device Keys when manufactured. The set of Device Keys may be unique per device or shared among multiple devices. The Media Key Block (MKB) is a set of keys created by the AACS License Association that allows each device to unlock and play back the content. If a set of Device Keys is compromised, a new MKB can be created that revokes the compromised set of Device Keys, so they can't be played back.
This idea has people hopping mad, because it means that if the key to your player is compromised and yanked, your DVD deck becomes a doorstop unless there's a ROM/firmware upgrade. There is network connectivity built into the AACS standard, implying CRM or content rights management operations. Yes, an Internet connection may be required after all.
SPDC provides the mechanism to revoke a player's ability to play all DVD titles, and can create traceable content, since HD-DVD players include recording capabilities. So if a movie is cracked using a particular deck that you buy, that deck is going to be a doorstop. Even more Orwellian is the fact that the players get revocation information from each new disc played. So each new disc acts as a snitch for the old ones that are compromised. This information is stored in non-volatile RAM, and can modify your player's firmware.
Given how Divx's intrusive nature was one of the big strikes against it, this might tilt DVD supporters against HD-DVD. I've yet to hear such criticism of Blu-ray's AES method, so this could prove to be the sleeper issue differentiating the two formats...”
If this is true, I'm supporting Blu-Ray.
For the full article, visit:
www.tomshardware.com/business/20050616/index.html