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1. #DIVX DECRYPTION SOFTWARE MOVIE#
2. #DIVX DECRYPTION SOFTWARE SOFTWARE#
3. #DIVX DECRYPTION SOFTWARE DOWNLOAD#

Once he has device keys, he could in principle publish them (or equivalently publish a program containing them), thereby allowing everybody to extract title keys and decrypt discs. In other words, his program will be able to do both steps of AACS decryption.

#DIVX DECRYPTION SOFTWARE SOFTWARE#

If he can do this, then he can write a software program that can do everything his player can do, including decrypting disc headers and extracting title keys from them. Eventually, the extraction might be automated, so he need only insert a disc into his player and then activate a key-extractor device (or program) that he built.Īlternatively, he might try to extract the device keys from his player device. Having extracted the title keys for a few discs, the engineer will learn how and where the keys can be found and will have a much easier time extracting keys from other discs. There are economies of scale in key extraction. An engineer who extracts a key can upload it to the online database or share it with his friends. This will probably be easier to do for software players that run on PCs, and somewhat more difficult for dedicated player boxes but in either case it will be possible.

A skilled engineer who works hard enough will be able to find and extract that stored title key. Every player device, when decrypting a disc, must recover the title key and store it somewhere in the player’s memory, so that the title key can be used to decrypt the movie’s contents. Title keys will, however, be enough to enable in-home fair use.īut where will title keys come from? Probably they’ll be captured by reverse-engineering a player.

#DIVX DECRYPTION SOFTWARE MOVIE#

Of course, the title key is useful only if you have access to a disc (or a copy of the full encrypted contents of a disc), so some kinds of infringement will be easier with movie files than with title keys.

#DIVX DECRYPTION SOFTWARE DOWNLOAD#

One difference is that a 16-byte title key is much smaller and easier to distribute than a huge movie file – even a dialup line will be able to download title keys in the blink of an eye. It’s interesting to compare this system with an alternative that distributes decrypted movies. This decryption software and database don’t exist yet, but they seem inevitable. This new decryption program will be able to decrypt any disc whose title key appears in the database. Somebody will make an online database of title keys, and will modify BackupHDDVD so it automatically consults that database and gets the title keys it needs. The BackupHDDVD program does only the second step, so it is worthless unless you can somehow get the title key of the disc you want to access.īut decryption tools will evolve. Then the player uses the title key to decrypt the movie. First, the player device uses its device keys to decrypt the disc’s header, thereby getting a title key that is unique to the disc. Recall that AACS decryption goes in two steps.

In Monday’s post I gave some background on AACS and the newly released BackupHDDVD tool. Let’s continue our discussion of AACS (the encryption scheme used on HD-DVD and Blu-Ray discs) and how it is starting to break down.