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You're right, the file format is "TEXtREAd", but it's also encrypted according to Calibre. I commented out the check in mobidedrm to ignore the header, but then I got the error message "invalid encryption type: 1" - the script is expecting the crypto_type to be 2. I tried commenting out this check, but then the script fails later on somewhere in the unpack method. To me, it looks as if a different encryption algorithm is being used.
I only purchased this book a couple of days ago; it was purchased directly from the publisher.
-Wayne
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