No, unfortunately it's assigned to them (that's why your publisher is listed as 'bookbaby'). You can't take that ISBN, just like people who use createspace's ISBNs can't use them elsewhere either. But like you say, it might be a non issue if you're having a good experience with them, and they don't show any signs of closing shop anytime soon.To my understanding, the ISBN is mine now, assigned to the book, not connected to them. There really don't seem to be many strings at all to keep me from doing later books with someone else (though I probably won't want to.) Thanks, though!