Thus, a DOI can be assigned to every e-book based on its ISBN
and to every part (chapter, section, or page) of every e-book.
This flexibility could support Pay Per View models (such as
Questia's or Fathom's), POD (Print On Demand), and academic
"course packs", which comprise material from many textbooks,
whether on digital media or downloadable. The DOI, in other
words, can underlie D-CMS (Digital Content Management Systems)
and Electronic Catalogue ID Management Systems.
Moreover, the DOI is a paradigm shift (though, conceptually,
it was preceded by the likes of the UPC code and the ISO's
HyTime multimedia standard). It blurs the borders between
types of digital content. Imagine an e-novel with the video
version of the novel, the sound track, still photographs, a
tourist guide, an audio book, and other digital content
embedded in it. Each content type and each segment of each
content type can be identified and tagged separately and,
thus, sold separately - yet all under the umbrella of the same
DOI! The nightmare of DRM (digital rights management) may be
finally over.
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