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Thank you for the reply. I imported the book(s) via 'Add books from directories', then changed the meta-data (Author and Author_Sort) and saved the changes: Calibre wrote a separate Metadata file in the EPUB book's folder (as expected). Upon export to my mobile (I use FBReader Premium) I suppose that it updated the 'Aut' ID in the EPUB embedded metadata (the ID was already there).
However, the original EPUB also has an 'Author' ID which obviously doesn't get removed by Calibre (why would it :-), nor updated. Unfortunately FBReader detects and uses it. Even worse: it remembers it... updating the EPUB file on the mobile isn't enough, even clearing FBReader cache isn't enough: I must clear all data (which resets the app to all default values). So I want to good way (in Caliber) to remove all 'Author' ID's before I move them to my mobile... The only way I found until know is a multiple book convert from EPUB to EPUB, and then manually remove the 'ORIGINAL_EPUB' files via Calibre. But we're talking many hunderds here... so I'd prefer a batch that removes the 'Author' ID from all my EPUB books without creating a copy.
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