[jimcon]

Shane
Thanks for your thoughts
What I am trying to protect is a set of four books in PDF format.
Right now, I think that Multimedia Protectorbis my best bet
It converts the PDF file so that only a special viewer can view or print the content
I plan to offer the books with a five day time out that is ties to the user's
'computer. Until the product is bought, they will not be able to print it
After they they buy it, they can print only one copy

Since these books are sold over a large geographical area, there is no way that I could be aware of a buyer making copies. So watermark types of protect will offer very little protection.

I have one of these PDF documents in a public folder at Dropbox, if you want to take a look
I have no experience with Photoshop, so I would be very interested in finding out if your approach would work.
If you want to try the Photoshop that you mentioned, send me a PM and I will send you the address.