Give or sell 2nd hand non-physical goods

We all have bought books, games, apps or music materialized or dematerialized - when you have a real book you can resell or lend it to someone - this is not the case with dematerialized assets.

Why ?

Let’s build a project around this - so anyone who buys an ebook links it to a token showing he is the buyer - then he can sell the book to someone else who becomes the new owner of the good.

What do you think ?