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I don't use pdfs much, I kind of hate the Acrobat software. Hopefully someone else can jump in and tell you how to do that, or if its possible.
Do you have any IT/programming skills? You could package your ebook as a .net application, which would let you put any type of protection you want in. That sounds far fetched and like too much work, but Microsoft put out a shareware starter kit that does payment verification, and license copy protection. So using all that to make a viewer for custom encrypted data wouldn't take that much work, and give you the ultimate level of protection. I'm not really sure how people go about applying DRM to mostly text content?
I spent most of the day in West Seattle, walked a friend's dog along Alki, but I live in Queen Anne near Kerry Park.
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