Category F (VIP)
This is the category for Publishers of Books and Journals. Getting an ISBN for a published content is good but adding a DOI to the content explodes the visibility and reach of that content. ISBNs are used to identify each unique publication whether in the form of a physical book or related materials such as eBooks, software, mixed media etc. while The DOI® System offers a persistent actionable identifier for use on digital networks. In this category.
Publishing bodies will pay a yearly membership fee of $500, and $1 per DOI.