coolnoddle

Hello, I am trying to put powerpoint on my server. When user who download this powerpoint into their computer, only that user can view it from that computer. If that user give the .ppt file to his/her friends, his/her friends cannot open this file in their computer. I am thinking maybe I can have third party program to activate that .ppt file in particular computer. So people cannot copy this powerpoint file to each other. Is anyone can help me with this? Thanks coolnoddle