Quote - So all software Blu-Ray and HD-DVD players will likely be 64 bit, so XP and 2000 are out.

HD-DVD players have nothing to do with 64 bits,it doesn't matter what they have inside, and you can be sure that inside a DVD player there is only a 16 bit processor or even a 8 bit, nothing of 32 bits neither 64 bits.
The DVD player is interfaced to the computer by means of a flat 40 wires cable following the EIDE electrical/software specification. You can use the same player with PC 16/32/64 bits, with Windows or Linux. With Mac hardawre and OS and even with Sony Playstation.

Quote - The data on Blu-Ray discs is similarly encrypted, only one can assume with a much stronger scheme.  They also learned their lesson with CSS and made it so that they would be able to revoke compromised keys (thus disabling the players that use them; of course there are issues with disabling people's Blu-Ray and HD-DVD players, especially if a certain compromised key is also used in a lot of legitimate players).

If you buy a DVD you want to play it with your DVD player, with your TV set, with your computer or even play it in your car. I suppose that  you are not going to purchase a special DVD that you only can play it in your computer.
The DVD data is always the same, it's a read-only-device. Your DVD, your TV and your car are not conected to the internet, so the DVD reader's decoding scheme is hardwired, always the same and the same for any DVD. There's no way to enter a license into a DVD player, you only can select the options and scenes.
It doesn't matter how the DVD data is encoded in the disk, RIAA and MPAA must give the player fabricant all the information and keys needed to decode the disk data, if not their product will be useless and the keys and information are the same for all disks and don't change through time.
Even a fabricant that haven't signed their license and so has not this data, he always can take some DVD players some other fabricants and by reverse engineering make his own DVD player product.
Also this information is not a deep state secret and so, it circulates freely around the world.

Stupidity also evolves!