Thread: EPUB3: ...obfuscated fonts, but...key missing from OPF
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Old 09-19-2022, 08:14 PM   #12
jhowell
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Device: Kindles
Relevant to what is going on here in case it is not clear, Kindle formats do not contain an OPF. The one you see is constructed by either KindleUnpack or calibre using metadata from the AZW3 file. Each piece of software has its own method for doing it. There is no single correct way.

There is no direct equivalent to the EPUB identifier in AZW3. AZW3 format supports obfuscated fonts but uses a separate key stored with each font.

There really does seem to be a calibre bug in conversion of books with multiple identifiers and obfuscated fonts to EPUB 3 but is it only tangentially related to AZW3 as the source format.
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