ISBN stands for “International Standard Book Number”. ISBNs are essentially 13-digit numbers used as product identifiers for publishers, booksellers, libraries, internet retailers and other supply chain participants for ordering, listing, sales records and stock control purposes. Each ISBN identifies the registrant as well as the specific book title, edition and format. The ISBN is an identifier only and does not convey any form of legal or copyright protection. Some counties require an ISBN to identify publications. Publishers should apply for ISBNs. For the purposes of the ISBN, the publisher is the group, organization, company or individual who is responsible for initiating the production of a publication. Generally, it is also the person or company that bears the publishing costs who applies for the ISBN. BookWrangler will file for your ISBN no matter which package you choose (included in Basic Package, Premier Package and Ultra Package)