Video without possibility of download it

I'm developing a platform to upload videos but anyone could download thems on anytime with some knowledge of html/scripting. Then I need a script where I can upload a video without any possibility of download it. Something like this, below: <a href="[login to view URL]">Watch me!</a> The "href" tag should be some script that allow watch the video but without possibility of download it. The language should be PHP (server side).