How to protect media directory with .htaccess?

Question

# Only allow access to this directory if they are coming from your domain; excluding you, your server, Google and any other IPs
RewriteEngine On
RewriteCond %{REMOTE_ADDR} !^(xxx\.xxx\.xxx\.xxx|xxx\.xxx\xxx\.xxx|66\.249\.)
RewriteCond %{HTTP_HOST} !^(127\.0\.0\.0|localhost) [NC]
RewriteCond %{HTTP_REFERER} !^https?://(.+\.)?yourdomain\.com/ [NC]
RewriteRule .* http://yourdomain.com/ [L]

That should help, I think