Thread: Clear metadata more completely
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Old 03-03-2020, 01:35 PM   #7
jhowell
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Posts: 7,097
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Join Date: Nov 2011
Location: Charlottesville, VA
Device: Kindles
The mandatory metadata in EPUB varies by version. Newer versions require a modification date.

Metadata in AZW3 format is stored in an EXTH data structure. Calibre fakes the existence of an OPF for editing purposes, but some metadata fields do not translate exactly.
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