I understand your point about the hashes and absolutely agree. But if I export the book 10x with Calibre (desktop), I get the same file (same hash A) each time. And if I download it 10 times via Calibre (server), I also get the slightly different file 10 times identically (same hash B). Hence my assumption that something is different after all.
(Regarding KOReader, I could use not the binary based hash but filename based hash. But then the hassle starts to get them equal, and I can't configure the calibre-server "offered" filename at all.)
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