javascript - Implementing protection for source images -


while browsing came across link

as can see image protected, if browse cars-database.com take source image , same message.

this first time see , wonder how has been implemented? know?

screenshot of protected source image:

enter image description here

here's simple example on how implement similar in nginx: 

location ~ \.(jpe?g|png|gif)$ {      valid_referers none blocked mysite.com *.mysite.com;      if ($invalid_referer) {         rewrite ^ http://mysite.com/lowres$request_uri permanent;     } }

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