nostr:npub19mptcg4nywj8x2ew0g457r0y7d95pqh5y263ctgjf04wj2yhhahqfuzsye 
> So a book is a product but an ebook isn’t? How does that work?

Think about the fundamental differences between the 2;

* A book is produced. An e-book is copied

* A book is sold to you, with an irrevocable license to *that copy* of its contents, to do with as you please, including loaning or giving it to someone else.  An e-book is licensed to you, and if you