Nginx Configuration for Video Streaming With Secure Link

here is nginx configuration i used for a video site that have secure link.

    server {
        listen   188.40.131.92:80;
        server_name s1.video.bizhat.com;
        access_log /var/log/nginx/s1.video.bizhat.com.log;
        error_log /var/log/nginx/s1.video.bizhat.com.error_log;
        location ~ ^/media/(?[\w\-=]+,\d+)(?/.*\.flv)$ {
            secure_link $secure;
            secure_link_md5 $secure_link_expires.$file.hjAGhAJKAKAHJ89AHJ00AM;
            if ($secure_link = "") { return 403; }
            if ($secure_link = "0") { return 410; }
            alias  /home/s1.video.bizhat.com/private/$file;
            flv;
        }
        location ~ ^/media/(?[\w\-=]+,\d+)(?/.*\.mp4)$ {
            secure_link $secure;
            secure_link_md5 $secure_link_expires.$file.hjAGhAJKAKAHJ89AHJ00AM;
            if ($secure_link = "") { return 403; }
            if ($secure_link = "0") { return 410; }
            alias  /home/s1.video.bizhat.com/private/$file;
        }
    }

This video server is a storage server in vShare Youtube Clone script.