## PdfDigitalSignatureD() {#default} Initializes an instance of this class. ```python def __init__(self): ... ``` ## PdfDigitalSignatureD(certificate_holder, reason, location, signature_date) {#cer...... ```python doc = aw.Document() builder = aw.DocumentBuilder(doc=doc)...signed PDF.') certificate_holder = aw.digitalsignatures.CertificateHolder...