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To sign an existing approval signature field in a PDF Document:
doc = PDFDoc(docpath) # Retrieve the unsigned approval signature field. found_approval_field = doc.GetField(approval_field_name) approval_digsig_field = DigitalSignatureField(found_approval_field) # (OPTIONAL) Add more information to the signature dictionary. approval_digsig_field.SetLocation('Vancouver, BC') approval_digsig_field.SetReason('Document approval.') approval_digsig_field.SetContactInfo('www.pdftron.com') # (OPTIONAL) Add an appearance to the signature field. img = Image.Create(doc.GetSDFDoc(), appearance_img_path) found_approval_signature_widget = SignatureWidget(found_approval_field.GetSDFObj()) found_approval_signature_widget.CreateSignatureAppearance(img) # Prepare the signature and signature handler for signing. approval_digsig_field.SignOnNextSave(private_key_file_path, keyfile_password) # The actual approval signing will be done during the following incremental save operation. doc.Save(outpath, SDFDoc.e_incremental)
Digitally sign PDF files
Full code sample which demonstrates using the digital signature API to digitally sign and/or certify PDF documents.
The PDFTron SDK enables approval signatures in PDF documents using a Digital Certificate, in accordance with the latest PDF specification. By leveraging public key infrastructure (PKI) technology, with a certificate issued by a trusted certificate authority (CA), a signer can use a certificate-based digital ID to guarantee the authenticity of a signature. Placement of a digital signature using a certificate can also guarantee that a document was not modified since the signature was placed, ensuring the authenticity of the document.
Above is an example of a document containing a certified signature, guaranteed by a certificate generated by PDFTron.com.
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