Revisiting an unsolved problem.
I have Runtime solution with a pdf in a container field. To stop users copying the pdf the safest route appears to be using FM in Kiosk mode where a script issues a pw to the pdf. The FMS will initially be for Mac/PC so I'm assuming there will a need so 'Send event' and either Applescript or cmd.exe.
Perhaps the biggest problem is getting the cursor into the password dialogue box in order to issue the password. Don't forget I'd like to keep the pdf within FM, not open it in a pdf viewer (less secure I think). If any extra app is required, it needs to be a pluggin integral to the FM solution, otherwise users won't cope.