If someone discovers the URL of your media files directory (e.g. http://yoursite.com/videos/video.mpg) then he can go to the browser point to that URL and download the file.
So... how can i make those files private?. I don't want people to download it.
what i am trying to do is a site where registered (paying for it) people can see particular videos. and i don't want people to see those videos for free.