Quote:
Originally Posted by peterdanckwerts
All I'm saying is that Calibre doesn't default to good practice. It shouldn't encourage users to apply the same ISBN to different formats.
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AFAICT, calibre is neutral on this. When you add a different format you've purchased, you can tell calibre to create a new record or add it to the existing record. Calibre doesn't care. The former is what you want, the latter is what I do. Adding books with a publisher-obtained ISBN is where the concept of ISBN has meaning, if it has any at all for ebooks.
As far as creating new formats by conversion - there is no applicable ISBN that's any better than the ISBN for the source format, so the new format should have the same ISBN as the source.