When I give talks about content monetization, someone usually asks about piracy protection.

There is no way to protect against piracy.

My suggestion is always monetize piracy. How exactly you do this depends on your product.

P2P content provision can be used in many ways to boost marketing traction.

Big difference between free publicity + MVP testing.

And, I suggest you use Meetup. I tend to do all my MVP testing giving free Meetup talks to live audiences.

The questions you get will help you refine your pitch/copy + maybe your product/service/info design.

You might clarify your question a bit, based on where you are in your book's lifecycle + also your book title + topic.

Likely other people will have great suggestions based on your specifics.