Hi,
I do have already one desktop application, where customer needs to put his email id, if his email address is approved by Admin , then user can view the pdf file in a application..
No download of pdf, no screen shot, not with any screen shot capture software, user can copy any page..
And user can view that pdf on only one system, same user cant assess the pdf in other system, as we are capturing MAC address as well.
Regards,
Rajnish