The answer might be to use the IPN (instant payment notification) system on PayPal. It's free and not too complicated. After someone buys something, PayPal returns the customer to a "hidden" page of your site where the customer can download the book (as opposed to returning them to a standard thank you page). Also, to go a bit further, I added code on that page that hides the actual download link, which prevents the paying customer from forwarding the link to all and sundry.
I'm a website designer so have done lots of different systems, but I found the IPN method very simple for those who want a free service. I don't use it on my own site because I only sell signed paperbacks, but I've done it for a customer who was selling mp3 tracks.
You can check it out in PayPal under Profile > More Options > My Selling Tools (look for "Instant payment notifications").
There are always those who refuse to use PayPal, and that's their choice. Probably the same number of people refuse to use credit cards online. That's also their choice. The best thing is to offer a few options -- PayPal, Google Checkout, Amazon links, maybe even a "manual" option via email for those who want to write you a check or stop by your house with cash!
Of course, you can never stop people from emailing their downloaded book to all and sundry, but that's the danger of selling PDFs and so on. For that reason I never sell PDFs.
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