what I have in my site:
## DISABLE HOTLINKING
RewriteEngine on
# Options +FollowSymlinks
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?aaaaa.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://(www\.)?bbbbbbb.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://(www\.)?cccccccc.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://(www\.)?ddddddd.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://(www\.)?eeeeee.net/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://(www\.)?fffffff.com/.*$ [NC]
RewriteRule \.(gif|jpg|jpeg|png|js|css)$ - [F]
a,b,c,d,e,anf are exceptions
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