What is ISBN?

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ISBN full form is International Standard Book Number. An ISBN is a unique number given to every book around the world. An ISBN is essentially a product identifier used by publishers, booksellers, libraries, internet retailers and other supply chain participants for ordering, listing, sales records and stock control purposes. The ISBN identifies the registrant as well as the specific title, edition and format.

A separate ISBN is assigned to each edition and variation (except reprintings) of a publication. For example, an ebook, audiobook, paperback, and hardcover edition of the same book will each have a different ISBN assigned to it.

The ISBN is an identifier and does not convey any form of legal or copyright protection. However, in some countries the use of ISBN to identify publications has been made into a legal requirement.

An ISBN is an International Standard Book Number. ISBNs were 10 digits in length up to the end of December 2006, but since 1 January 2007 they now always consist of 13 digits. ISBNs are calculated using a specific mathematical formula and include a check digit to validate the number.

Each ISBN consists of 5 elements with each section being separated by spaces or hyphens. Three of the five elements may be of varying length:

Prefix Element – Currently this can only be either 978 or 979. It is always 3 digits in length.

Registration Group Element – This identifies the particular country, geographical region, or language area participating in the ISBN system. This element may be between 1 and 5 digits in length.

Registrant Element – This identifies the particular publisher or imprint. This may be up to 7 digits in length.

Publication Element – This identifies the particular edition and format of a specific title. This may be up to 6 digits in length.

Check Digit – This is always the final single digit that mathematically validates the rest of the number. It is calculated using a Modulus 10 system with alternate weights of 1 and 3.

It is always the publisher of the book who should apply for the ISBN. For the purposes of ISBN, the publisher is the group, organisation, company or individual who is responsible for initiating the production of a publication. Normally, it is also the person or body who bears the cost and financial risk in making a product available. It is not normally the printer, but it can be the author of the book if the author has chosen to publish their book themselves.

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