Recently I had one site (which I sold recently) was being copied and duplicated by bollywoodsargam.com.

Hence I decided to provide anti-leach technique to images as well as files.

Using:

RewriteEngine on

RewriteCond %{HTTP_REFERER} !^$

RewriteCond %{HTTP_REFERER} !^http://(www\.)?mydomain.com/.*$ [NC]

RewriteRule \.(jpg|gif|js|css)$ - [F]

This resulted in my images which were indexed by search engines been shown 403 forbiddin that was really a bad idea, I had to say no no to it

So I decided to modify the above code to fit exactly in only blocking CSS Files and nothing else.

Using:

RewriteEngine on

RewriteCond %{HTTP_REFERER} !^$

RewriteCond %{HTTP_REFERER} !^http://(www\.)?mydomain.com/.*$ [NC]

RewriteRule \.(js|css)$ - [F]

This really helped, get the images back on Index and stop CSS stealing and it looks like the CSS Stealers page is completly broken.

Replace Mydomain.com with your domain name.