Book Industry Study Group releases its policy statement assignment of ISBNs to digital products. To read the official announcement go here.
The aim of the statement was the address the critical need to reduce product identification confusion in the digital market place in order to provide the best customer experience.
Here are some relevant excerpts that you might be interested in.
- “Separate ISBNs should be assigned to all unique Digital Books for ordering, listing, delivery and sales tracking purposes. In general, there are three major factors that determine the need to assign unique ISBNs to Digital Books.
- Content: If two digital books are created, one an exact textual reproduction of a Physical Book and the other an enhanced version that includes video, audio, etc., then the two Digital Books are unique and different products, and each requires a unique ISBN.
- Format: If an EPUB format, a PDF format and a Mobi format (among others) are created, each format should be assigned a unique ISBN. This is similar to creating a hardcover and paperback edition of a Physical Book and should follow the same rules regarding ISBN assignment.
- DRM: When the application of DRM software is part of the transaction with the Consumer (as frequently happens in the US) it does not constitute the creation of a new format as the term is being used in this Policy Statement. In this case, DRM is not a format: it is a wrapper around a product. An EPUB file with DRM software applied is still an EPUB file, a PDF file with DRM applied is still a PDF file. In this case, DRM is not part of the product, it is part of the transaction. An ISBN is a product identifier, not a transaction identifier.
- Usage Rights: If a Digital Book is made available with different usage rights in different markets (e.g. adjusting the usage settings so that printing is allowed in the version going to the education market, but not in the version going to the retail market), each version should be assigned a unique ISBN.”