.htaccess for Securing Videos

I am new to .htaccess and I want some help.

I have created a website for a client that wants to upload videos and visitors have to pay to view the videos. The problem that I have is the following. I am using PHP and MySql and when the visitor pays and and clicks on the link to see the videos, if he goes to view source from his explorer he can see the path of the video so he can download them without paying.

I want someone to help me with the .htaccess commands to allow the videos to play in the explorer only through a php script and not allow the videos to be downloaded or viewed directly in the explorer if anyone knows the excact path of the video.