Choose this if you explicitly do not trust the certificate owner, e. g. because you have knowledge of him certifying without checking or without the certificate owner's consent. Certifications at this trust level are ignored when checking the validity of OpenPGP certificates.
Escolla isto se explicitamente non confía no propietario do certificado, por exemplo porque sabe que certifica sen comprobar ou sen o consentemento do propietario do certificado. As certificacións con este nivel de confianza ignóranse ao comprobar a validez dos certificados OpenPGP.