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Hi,
In case it matters. "drmion", based on a simple Google search, is one variation of a Permutation Cipher that permutes the positions of bytes/characters in each set of K characters to simply protect the data (not really encrypt it). To decipher it you either need the key (or its key length and a piece of known plaintext). It is not a strong cipher.
Of course, the "DRMION" and "ProtectedData" shown in the picture in an earlier post may have nothing whatsoever to do with the drmion permutation cipher (there was an AES/CBC string there as well according to the picture as well) but if someone had access to the full .kfx file and got the same version of the .azw3 or mobi file) you may be able to figure out if they are simply using a permutation cipher to confuse the issue.
My 2 cents ...
KevinH
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