Why can't I remove the ISBN from my Trade book?

If you're making a Trade book (8x10, 5x8, 6x9), you may have noticed that we automatically apply an ISBN to the back cover. It is not possible to remove the ISBN for Trade books made with BookWright, InDesign, or our PDF uploader. The ISBN is mandatory for these books because our print shop uses the ISBN to internally track and match the different parts of the book during production.

An ISBN is optional for all other book formats made in BookWright and InDesign.  

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