I stand corrected. There is a difference.
Old titles, in their rights.xml have
Quote:
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<encryptedKey keyInfo=\"passHash\">XXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX</encryptedKey>
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New titles:
Quote:
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<encryptedKey>XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXX</encryptedKey>
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This seems to be a new change to downloaded books. The tools should fail to extract a book key, since the key is no longer encrypted using the per-user key and the padding will be incorrect.