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ISBN book number ownership is perhaps the most misunderstood aspect of self-publishing your own book. The Internet is full of misinformation on the subject. Every book that is going to be sold commercially must have an ISBN book number -- period.
*NOBODY can assign, give, lend or sell you an ISBN except for the US agency, RR Bowker. So, when self publishing books, just visit http://www.bowker.com/ to find out all the information you need to obtain an ISBN.