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Yup, Wannabe: 'Fraid I'm one to disagree.
Early on, each ebook edition required a separate ISBN, but that was a money-spinning ploy by the ISBN agencies (don't forget they're commercial). It would cost even a small indie like my own with 120 titles in paperback and three ebook editions at any given time a bundle. We'd be going through ISBNs, which we buy in batches of 100, like a ferret through a rabit hutch.
It was soon dropped and a single ISBN serves for all digital editions now.
Thing is that the ISBN is merely a search facility. Once an ebook is identified, the buyer is presented with format options.
Separate ISBNs are assigned to hardback and paperback editions of a title to avoid confusion. No such confusion exists when a third ISBN is applied to all ebook formats.
Cheers. Neil
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