15.20. Where a holder no longer wishes to use his certificates, he shall notify the registrar of the date on which he intends to cease using them and request their withdrawal. The certificates shall be withdrawn following verification of the holder’s identity.
The withdrawal shall become effective when the certificate serial numbers are entered on the list of withdrawn or revoked certificates, which shall be at the latest on the first working day following the date indicated by the holder in his request or on the first working day following the verification of his identity.