User-agent: *
Disallow: /llave.asc
Disallow: /imagenes
Disallow: /forms
Disallow: /blog/rate_cgi.php
Disallow: /blog/trackback.php

#Unknown robot (identified by empty user agent string)
RewriteCond %{REQUEST_METHOD} !^HEAD$
RewriteCond %{REQUEST_URI} !^.*robots\.txt$
RewriteCond %{REQUEST_URI} !/favicon\.ico$
RewriteCond %{HTTP_REFERER} ^$ [NC]
RewriteCond %{HTTP_USER_AGENT} ^$ [NC]
RewriteCond %{HTTP_REFERER} ^-?$ [NC]
RewriteCond %{HTTP_USER_AGENT} ^-?$ [NC]
RewriteRule .* - [F]