Hope you have to remember some points.
May be you want to restrict print button for restricting print preview to hard copy.
->if they use pdf! at command prompt , what will happens, print preview will be convert to the soft copy.they can save in desktop and make it as hard copy, Have you imagined in this case.
->In my system there is no printer attached, so, when ever i press the print button one spool is generated. then i am go to sp01 and , i can download the soft copy, then i will make hard copy.
hope you understood. above points you have to consider.