## PdfDigitalSignatureD() {#default} Initializes an instance of this class. ```python def __init__(self): ... ``` ## PdfDigitalSignatureD(certificate_holder, reason, location, signature_date) {#cer......PdfDigitalSignatureD(certificate_holder, 'Test Signing', 'My Office', signing_time)...RIPE_MD160 self.assertEqual('Test Signing', options.digital_signature_details...