There's an ebook I've been advertising that I found out is being sold by 3rd parties on eBay AND on shopify type websites (they charge people slightly cheaper for the ebook and they get it through the payment processor on the website). My question: 1. How are they getting away with this? One of the sites is a year old and has been selling for that long. 2. Is this legal? 3. Should I get in on it?