The only way to secure an ebook is through Digital Rights Management. A costly process. Work with a distributor that will encode your books in a secure fashion, or give up on restricting access. You might sell more books than you thing.
First let me thank you for your reply. I started into my eBook software search on PC products and found they offered good security where you can have some pages open for viewing and encrypting the others until the purchase is made. They can also limit the eBook to opening on one computer and have up to 1000 passwords. Then I'm reading a software review and found out only eBooks in PDF format can be read on all computers and realized that for me trumps everything else.
Using the above as a backdrop I was very surprised to find that PDF software included little to none of these features and am concerned my book could be easily pirated. Do I understand from your reply that I may be overly concerned from the security standpoint?
With "one password only" doesn't that mean one person can purchase an eBook and send it to all his buds along with the password giving all full access? I don't know Michael, it scares me to think I can't better protect something I've worked on for so long. Is there not something between "a costly process" and protection beyond one password?