With PDF Profit Lock You Can:

  Include your newsletter subscription form.
  Promote a sales page, an upsells or special Offer.
  Redirect readers to your affiliate links.
  Give readers access to help files or important information.
  Create updatable / related tips or news pages.
  Offer 'Reader Only' discounts or exclusive special offers.

But Wait A Second . . . Maybe you also write and publish your own special reports and ebooks? 

If so then the added security features included in PDF Profit Lock will be just what you've been looking for too . . . 

You can password protect your files, add expiry dates to them and send users to the web page of your choice once the times up - it's a great way to offer trial versions or review copies of your work.