htaccess : interdire l'accès direct aux documents d'un site

RewriteEngine On 
RewriteCond %{HTTP_REFERER} !^http://www.votresite.net.* [NC]
RewriteCond %{HTTP_REFERER} !^http://www.votresite.info.* [NC] 
RewriteRule /* http://www.votresite.info [R,L]

http://www.devblog.fr/2011/12/16/proteger-lacces-direct-a-des-fichiers-via-htacces

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RewriteEngine On
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://www.example.com [NC]
RewriteRule \.(jpg|gif|png)$ - [F]

http://www.coinduwebmaster.com/bloquer-acces-images-hotlinking/61/