15.22. The registrar may on his own initiative suspend or revoke key pairs and related certificates where
(1) more than 6 months have elapsed since the holder last used the certificates;
(2) there is reason to believe that a certificate has been altered;
(3) there is reason to believe that the security of the key pairs or certificates has been compromised;
(4) the holder is no longer authorized to transmit documents electronically on others’ behalf to the registry office, provided that the registrar has been notified; or
(5) the holder fails to fulfil his obligations.
The registrar shall suspend the key pairs and certificates before revoking them and, except in the situation described in subparagraph 4 of the first paragraph, notify the holder, by any manner providing proof of delivery, that his certificate has been suspended and that he intends to revoke it. Any comments by the holder shall be submitted within 15 days from the date the notice was given.
Following the suspension, the certificates shall be either reactivated or revoked. The revocation shall take effect when the certificate serial numbers are entered on the list of withdrawn or revoked certificates, which shall be at the latest one working day following the revocation.