The best way to sell an ebook on my site

I want to sell an ebook I wrote on its own WP site. I am making a sales/squeeze page for it and I want a big shiny "BUY NOW" button at the bottom, not like a product display page for an eCommerce site. Simple, right?

Well the problem is if I use Paypal to do that then they are redirected to a download page to get their book. Then what happens if someone shares a link to the download page to social media or email? Not good.

So I am kind of stuck. Any ideas?

Thanks!