Quote:
Originally Posted by DNSB
As a crosscheck, I opened the epub in calibre's editor and the dc:identifier line had disappeared when I opened the content.opf file. Nastily, even if I opened the book and closed the calibre processes from Task Manager, the change in content.opf was still saved.
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The calibre editor has an option in the "Integration with calibre" tab: Update metadata embedded in the book when opening.
I make sure to turn that off to prevent unintended changes to edited files.