How to prevent hotlnik images from your site

This is an example of how to protect the site direct links to your images from another site. For example a web master can set the site with high traffic and loads directly from your server.

Can lead to high load on your server. The result is more costs and greater bandwidth occupation on your server.
It can be prevented with a little code. in htaccess

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www.)?mydomain.com/.*$ [NC]
RewriteRule .(gif|jpg)$ -- [F]

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