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I have just opened issue #1118 at Apprentice Harper's github which attaches a log of my attempt to add Kurt Vonnegut's 2 B R 0 2 B, a public domain e-book from Amazon US, to Calibre. The results were similar to what I posted above. I suspect Apprentice Sakuya's pull request is in fact getting the .kinf2018 file and deriving the key, but the algorithm the plugin uses for the actual decryption does not deal properly with the new format. My mediocre abilities with Python and cryptography generally are unsurprisingly exhausted at this point. We can only wait until someone with the appropriate skills has the time and inclination to take matters further. Thanks to Apprentice Sakuya for getting us this far.
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