## PdfDigitalSignatureD() {#default} Initializes an instance of this class. ```python def __init__(self): ... ``` ## PdfDigitalSignatureD(certificate_holder, reason, location, Signature_date) {#cer......older, reason, location, signature_date) {#certificateholder_str_str_datetime}...reason: str, location: str, signature_date: datetime.datetime):...