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Sign a PDF document in Python

To sign an existing approval signature field in a PDF Document:

# Open an existing PDF
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.

linkAbout Adding An Approval Signature to a PDF Document

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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