How to create a no-authentication zone?

[Maestro_Ba]

Hi. I have installed mod_auth_shadow and I am very happy with it.
I have this configuration:

<Directory "/var/www/html">
        AuthName redes.telecom.pt
        AuthShadow on
        AuthType Basic
        require group dec dop
</Directory>

<Directory "/var/www/cgi-bin">
        AuthName redes.telecom.pt
        AuthShadow on
        AuthType Basic
        require group dec dop
</Directory>

As I understood, all the sub-directories beneath "/var/www/html" will enherit the same authentication. But I want to create just an area "/var/www/html/config" that doesn't require authentication.

This doesn't work:

<Directory "/var/www/html/config">
        AuthShadow off
        AuthType Basic
</Directory>

It it possible to do this? How can I do it?
Thanks in advance.