How to properly configure nginx with secure_link?

Question

Nginx

There is an article on Harb.
habrahabr.ru/post/120907
But I don’t finish something, how can I make a temporary link.
The link looks like this.
http://_site_/hls/live.m3u8
How do I encrypt this link correctly? Since now there is a broadcast and everyone who is not too lazy to pull themselves into VLC, they cannot go to the site, since only my site is registered in the crossdomain file.