How are they doing it, a code printed inside the book? How do they keep someone from simply copying the info? It would make sense, just wondering ass to how it's handled.
I dunno, but this was a topic of conversation at a "Future of the Book" seminar my literary agent held a few months ago. Australian publishers are already investigating/experimenting with print book packages that include eBook and audiobook versions. There are also ongoing discussions with publishers as to how eBooks might be lent out by public libraries, and how eBooks might make use of online interactivity.