AuthUserFile /dev/null
AuthGroupFile /dev/null
RewriteEngine On
RewriteCond %{HTTP_REFERER} !^
http://YOURDOMAIN.com/ [NC]
RewriteCond %{HTTP_REFERER} !^
http://www.YOURDOMAIN.com/ [NC]
RewriteCond %{HTTP_REFERER} !^
http://www.YOURIP/ [NC]
RewriteRule /*
http://www.YOUR_DOMAIN.com/ [R,L]