Quote:
Originally Posted by Geremia
Why? What metadata needs to be updated?
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Short and simple answer is any metadata that was not read from the ebook during the import process.
To expand a bit, some people may be happy with the crap that passes for metadata in many downloaded ebooks. Others prefer to correct errors, add a decent cover image, etc. For many people, their workflow is download the book and import it into calibre. Then they update the metadata since the series is missing or incorrect, the book comment is blank, perhaps you want to update the cover, correct the author name since you are CERTAIN that Unknown did not write the book, they want to remove the mass of tags that many authors/publishers seem to use to "optimize" their books showing up in searches and replace them with more useful (to you) tags, etc.
This modified information is not added to the copy of the book in your calibre library unless you deliberately choose to do so (Polish, Embed Metadata, Modify Epub, whatever). When you export the book from your library by sending to your device, saving to a folder or download from the content server, prior to sending the book, a temporary copy will be created and updated with that modified metadata.
Hopefully, this helps you a bit.