What stops the blu-ray reader from just ignoring the revocation list on the disk?
Now that I think of it, I wonder if compliant Blu-ray players actually save the new revocation entries and then continue refusing to negotiate with revoked TVs even for old Blu-ray discs.
What stops them from being sold that way would probably be the licensing agreement and honest players. I'd imagine in China, there are lots of these types of devices available.
if you want your blu-ray player to be able to read blu-ray disks you sign a contract that says you will respect the revocation list
if you change your mind later: your player key will be revoked and new blu-rays won't play on your device
(it's actually more sophisticated than this... they can block specific players too)
you can obviously think whatever you want, but you'd be completely wrong
DVD supported this 20 years ago, blu-ray's system is far more sophisticated and can even block individual players
The approach of AACS provisions each individual player with a unique set of decryption keys which are used in a broadcast encryption scheme. This approach allows licensors to "revoke" individual players, or more specifically, the decryption keys associated with the player. Thus, if a given player's keys are compromised and published, the AACS LA can simply revoke those keys in future content, making the keys/player useless for decrypting new titles.
the spec also supports a persistent CRL so a new disk can also stop your old disks from working
Then every time another player's keys are published it allows anyone to use the older player to read discs using the newer player's leaked keys. And some players are cracked but the keys aren't published, instead they use them to extract the disc key for every new disc and then publish all the disc keys, which can be used in the same way without revealing which player was cracked.