Rick;There are many different eBook compilers and it's difficult to get past the online hype, but sometimes you need to move beyond the obvious and look a little deeper. Activ E-Book has one feature that no other eBook compiler has. It's called Activ Script, a built in scripting language.
Why is this important? Activ Script gives eBook authors the ability to directly interact with a customers computer such as reading and writing files. For example you could keep track of test scores, or other customer choices made right in your eBook. With scripting "know how" you can even create standalone "exe" computer programs not just eBooks.
Of more importance to many Activ E-Book authors though, is the ability to use my HYPrLock Security software (requires Activ E-Book). HYPrLock has an Automatic Payment System that allows you to instantly issue a password after a customer purchase (without sending e-mails). The HYPrLock distribution system has a built-in ordering system for PayPal and ClickBank and the ability to sell your product with "BuyNow" buttons or "eBay" and automatically issue a password after your product is downloaded. HYPrLock can also instantly lock the eBook if a customer asks for a refund.
If you want to distribute PDF documents in your eBook, HYPrLock has a proprietary PDF security system called HYPrPDF that uses invisible PDF passwords. HYPrLock is the only security system that can prevent PDF hacking.
The HYPrLock Security system doesn't use an online database, tracking system or charge a hefty monthly fee. It's modest one time purchase allows you to provide exceptional security for an unlimited number of eBooks.
Ron