Probing different aspects of the validity of a signature

The PdfSignatureStatus objects returned by validate_pdf_signature() and other validation API functions provide a fairly granular account of the validity of the signature.

You can print a human-readable validity report by calling pretty_print_details(), and if all you’re interested in is a yes/no judgment, use the the bottom_line property.

Should you ever need to know more, a PdfSignatureStatus object also includes information on things like

• the certificates making up the chain of trust,

• the validity of the embedded timestamp token (if present),

• the invasiveness of incremental updates applied after signing,

• seed value constraint compliance.

For more information, take a look at PdfSignatureStatus in the API reference.