The following code is used to prevent HotLinking to jpg, jpeg, gif, png, and bmp file types.
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www.)?your-websitename.com/.*$ [NC]
RewriteRule .(jpg|jpeg|gif|png|bmp)$ - [F]
