Originally Posted by Ron Killian

Huh? They can get it easier with CB, than most other sites because CB requires a static download page. Many scripts used to automate the selling have timed links, like can only be downloaded only a certain number of times, in some many hours, the links expire, ect.

Best way is to use a script like I mentioned and not worry about it. All you can do. You can have all kinds of locks on your house, but if some one really wants to get in, they will.