When I submitted my software product for approval, I was told that I must remove the trial version from my site. I'm sure it's written somewhere in the policy, but I couldn't find where. I see here: http://www.clickbank.com/recurring_billing_faq.html that I can offer a trial period. What's the difference between offering a trial period an a trial version? Also, if I sell an eBook, am I or not allowed to offer a free sample chapter?