Most people will interact with a digital library through use of some app, something like Steam. Reselling in this context is as simple as the app owner simply d

Most people will interact with a digital library through use of some app, something like Steam. Reselling in this context is as simple as the app owner simply deleting the book from your list of books and adding it to my list of books, removing any local copies it knows about in the process (or simply reconciling it the next time the app is open). Is this a foolproof system? Hell no. It's not even that hard to cheat. But most users aren't terribly tech-literate in the first place. And also, most people tend to want to comply with the law. I quoted elsewhere Gabe's comment about piracy--it's primarily a service problem, and the evidence has generally shown that if you deliver the services that people want, the piracy rates plummet.