wana broadcast a movie once to my client and he shouldn't be able to save it, how?

Hi

My problem is that I have a movie and I wana show it to one of my client just once, after he sees it, I wana delete it and he shouldn't be able to save it. The only solution that comes to my stupid mind is that I use a authentication system with PHP, this way I can make sure that only the client whom I want can see the movie. Then after showing the movie I refresh the page with a sort of special value in the query string, this way PHP can find out that the movie was played once and it deletes it. But the problem is he still can save the movie on his computer, he can even have it in his temp directory! Is there anyway I can do it?

I should say that it's so urgent (as the question appears to be!) and I need a fast answer, pleaseeeeeeeeeeeee!

why can't you just stream it from your server....