Re: Blu-ray encryption brute-forced

Unruh wrote:
fabrice.gautier@xxxxxxxxx writes:
If you read AACS specs, you'll see that they have different rules for
Software and Hardware players. They expected all along that software
player would be broken. So software player keys are revoked every year
no matter what happens...

Wow. That will make them really really popular with customers. I bought
this player and software and now you tell me that it will only work for a
year and then I have to buy them again? You are going to keep soaking me
every year to pay for your stupidity?

Because the software player needs an update every year (for the new keys) does not mean that the user has to pay for it. Just that the upgrade has to take place. It is up to the software maker to decide whether to ask the customer to pay for the new version (and risk the ire you are expressing above) or not.


For example: the main money makers are new releases, they make the
most money in the first few weeks of a release. If they can use their
revocation system so that it would take more than a week to break new
releases then they are probably fine with that...

???? a) the dvd must be independent. The user is NOT going to phone in for
a new key every week. It must already be contained in the dvd player. Thus a break is most likely to be a universal break, just as Decss is now.

No. Every player has a set of keys (the device keys), which allow, or not, the decryption of a media-specific key. A more recent DVD can be designed so that older version of a given software cannot decrypt it, whereas new versions (with new keys) can.

Therefore, the example from Fabrice remains correct: each new DVD release can be made to not play on compromised platforms (including, possibly, recent or even current software platforms), but play fine on, a priori, uncompromised platforms. Of course, when the currently not compromised platforms are eventually compromised, the new DVD in question will be decrypted and pirated. The hope (from the producer's point of view) is that it happens after the main sales are done.
--
Bertrand
.

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