Posting here since Trac is acting all wonky on me (Warning: <acct_mgr.web_ui.MessageWrapper object at 0x4e6ec90> )
Just a suggestion, eventually, might it be possible to use the ePUB file's md5 hash (or similar) as identifier? I know there's a request for detecting file duplication based on signature/hash. Once that's implemented, I think it would be a reasonably unique way to identify ebooks.
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