electronic file sales question

Do you have a question? Post it now! No Registration Necessary.  Now with pictures!

I want to sell some e-books via a download page after customer has paid
using Paypal.
How can I secure the transaction so that they cannot just forward the url
for download to others thus avoiding payment ?
I've seen some sites which give a login with a limited time for download and
some with password protected files which only work once.
Perhaps someone can point me in the right direction.

Posted via a free Usenet account from http://www.teranews.com

Site Timeline