The current rule is that each separately orderable format has to have a different ISBN. Different ebook formats only need different ISBNs if buying one doesn't buy you the others. i.e. all the current DRM formats!
It is a bit of a mess, but I haven't worked out how to answer the survey yet. Mapping my thoughts onto their questions and answers is tricky.
Quote:
Originally Posted by Nate the great
An ISBN is a 10 (or 13) digit number that's basically a serial number for books. If a book came out in multiple formats (paperback, hardback, etc), each format had its own ISBN. This applies to ebooks as well; an ebook has a different ISBN for each format sold (LIT, Epub, Mobi, etc). The ISBN Agency has decided to reconsider this decision.
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