Quote:
Originally Posted by kovidgoyal
ids in epub are required as the package identifier. You cannot remove it, but you can change it using the edit book tool, simply edit the metadata.opf file and where you see it, change it to a random string.
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Oh, I see. But I used a site before that was able to permanently delete it completely (and all the other metadata) -->
https://products.groupdocs.app/metadata/clean/epub
This site only just stopped working all of a sudden and won't load any EPUB, let alone delete the metadata so I thought maybe Calibre would have a viable solution to erasing this ID maybe ahah.
I also don't quite know how to edit the content.opf file since it won't open in Sigil or Calibre E-book Editor...