Well, as Chrissie pointed out in his first post, this can be set when the PDF is created. The easiest solution would be to get the creator to set it, otherwise you could use something like Rick suggested.
You VIEW the .Pdf file in .NET with the code you posted. What you have been asked is how do you originally create the document as this is the point at which security can be applied.
I guess you are using the Adobe SDK. The control has onkeydown and onmousedown events you can trap.
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