+ <listitem><para><option>Trusted</option> (<option>trusted</option>)
+ is a tri-state value which defaults to APT deciding if a source
+ is considered trusted or if warnings should be raised before e.g.
+ packages are installed from this source. This option can be used
+ to override that decision. The value <literal>yes</literal> tells APT
+ always to consider this source as trusted, even if it doesn't pass
+ authentication checks. It disables parts of &apt-secure;, and should
+ therefore only be used in a local and trusted context (if at all) as
+ otherwise security is breached. The value <literal>no</literal> does
+ the opposite, causing the source to be handled as untrusted even if
+ the authentication checks passed successfully. The default value can't
+ be set explicitly.
+ </para></listitem>
+