I was reading about Muslix64 and there is a very interesting and informative forum with more than 50 pages, too much to read. I only was able to reach the 20th page, maybe some day I'll continue.
Some people believe him, other think that he/she is a hoax. Some have technical  knowledge, other do not and some even haven't technical knowledge have an excellent logic.
If you have time and patience is something worth to be read.
People that says that he is a hoax base on the fact that he published a program that without a key is unable to decrypt anything and he has not posted any key and he got it, only told that it was very easy to get the key.
For me this was just his/her master play.
What would be the use on publishing the key? beside legal problems and the risk of all the forum be closed what you can do with a key?, to watch one movie???? and what you do with the other movies?, from where you get the required  keys?
He/she neither told from which player he/she has extracted the key, he only told that he picked the easiest one for the extraction. This was wise.
If he had mentioned the player, the player after the flaw would be retired or upgraded, as nobody knows which player was the player can be continued to be used for extracting the keys.
He/she has only proved that it can be done, once proved that is possible many people will do the same, some will fail and other will have success.

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The amazing thing that I found reading all is the revocation process and the revocation process is a can full of worms that will explode in RIAA, AACS, Holywwod and DRM ass.
By the revocation process any HDDVD player can the blacklisted and so its license canceled and unable to play anymore.
Any HDDVD media will contain a blacklist, so inserting a media into the player if the player is in the blacklist the player will be disabled forever or until updated (kill himself, will do it???).
Ok, in theory it looks excellent against piracy, you remove unsecure players, but....when a player will be backlisted?
There are two possibilities, or the license of the fabricant is cancelled or the player was cracked and here is the problem!
Soon or later any player or version will be cracked, a cracked player will not respond to the suicide command so it will continue to playing as nothing happened. This is only a little problem, the biggest problem is with not cracked player.
You have a legal player without any crack and you are a legal user , someone cracked this player model and so it was blacklisted. You put a legal HDDVD into your player and suddenly you are not more able to watch any movie on it. The only way to continue watching all moviesthat you have  is to purchase a new player!!!!!
As any player will be cracked the new player will have a very short life and soon you will need to purchase a new one.
Multiply this by hundreds of thousands or million legal users, you know the result and the result can only be:

• The blacklist will never be used, or
• Nobody will buy HDDVD anymore.

Stupidity also evolves!