: Can I use a different ISBN when publishing a co-authored book in two different countries? I have what seems to be a rather complicated situation and need some advice. I have co-authored a book

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No, you cannot. It is illegal.

The ISBN codifies (among other things) the publisher. If you steal that ISBN, then you state that your book was published by your co-author's publisher. But you published that book. You are responsible for it, not the publisher of your co-author.

You are pretending that a different publisher published your book. Which is just not true. A correct imprint does not make it better, only more confusing.

You are scraping the bar code of a milk carton and glue it to your carton, because the milk comes originally from you and you are selling it also in cartons of your own. Does that make sense? I hope not.

BTW, I hope your co-author mentions to her publisher, that the book was published in the meantime by someone else. Otherwise she could get in trouble.

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Since your question specifically addressed ISBNs, I will limit my response to only that.

First of all, every country has a different organizing body that is responsible for distributing and managing ISBNs. Even if you had used the same publisher abroad and in the US, you still would have been required to obtain separate ISBNs. In fact, if you decide to republish your own book here in the US using a different paper size, that also would require a different ISBN.

Now, let's assume that you decide that you want to self-publish as an e-book. Each different format (mobi for Kindle, ePub for Nook, etc.) would require its own ISBN. One exception to that would be if you were using a service like Smashwords. They will create multiple formats for distributing to various retailers, but they will only need one ISBN because they are publishing them all at the same time. (Technically, you could do the same if you generate all the formats using the same source file.)

Also, if you decided to republish your print version using a service like CreateSpace or LightningSource, that would also require a separate ISBN. Basically, any time your book is published in a different format or in a different manner, it is usually going to require a different ISBN. There are a number of other factors, but these basic guidelines should be enough to cover most general scenarios.

There are probably a number of other problems you might have to deal with that will be much more problematic than the ISBN issue. Without knowing what terms you may have had with the original publisher, it's really hard to say, but you should probably seek legal advice just the same. (As mentioned in one of the initial comments.)

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