How to use secure link module with IP

Hello all,

I searched all forums but could not find a good result.
I am streaming some MP4 files and i am using ngx_http_mp4_module for this.
I also implemented secure_link module too. But I could not find a way to implement IP based secure link.
I am creating secured links with PHP.
Could someone point me to a tutorial or show me how to config an IP based secure linked mp4 streaming server ?

Best Regards