Hi fabian;Your post is a little vague on what you're actually trying to do. I appears that your web site entices your customers to purchase your eBook directly from your site. After clicking a ClickBank link these customers would be directed to your download eBook file.
If that is the case, I would suggest (if you can) set up an .htaccess file for your download folder that only allows access for you and from the ClickBank web site.
When the customer pays for your eBook, ClickBank directs them to your "Thank You" web page. The "Thank You" page could be placed in your download folder and it would contain the link to your eBook file(in the same folder). This .htaccess restriction would prevent anyone from downloading your eBook unless they pay for it.
If you can't directly set .htaccess perhaps you could get your service provider to do it for you. If that doesn't work I'd suggest looking at a new provider such as "iPowerWeb.com" that provides great website protection and download bandwidth for $7.95 per month.
as a last resort you could try using JavaScript to control access. This isn't as good but better than nothing.
