Blu-ray and HD-DVD will both use AACS (Advanced Access Content System) copy protection. They're still working to finalise the scheme, but it will have some wonderful features like crippling the playback quality unless you go out and buy a new, digital, AACS compliant display.

Both content providers and component manufacturers have historically been concerned about leaving open a kind of technological "back door" through which consumers could use analog displays to capture and record high-definition content. Even though no high-definition analog monitor exists, or apparently ever will, an existing analog player could still conceivably be utilized as a go-between to capture a high-definition signal, and transfer it in its entirety to a high-def recorder. With no digital equipment in the analog monitor or TV to restrict the output, the recorded image could possibly attain full quality, enabling the TV to bypass AACS.
[TG Daily]

Keen to hear your take but, since there's already a thread open about this over in, please comment there.