Delete Digital signatures from documents Leave feedback

GroupDocs.Signature provides DigitalSignature class to manipulate digital signatures and delete them from the documents over Delete method.
Please be aware that Delete method modifies the same document that was passed to constructor of Signature class.

Important information. Please be aware that digitally signed documents with valid certificates (pfx files) are secured and verified. Changing digitally signed document makes them untrusted from the digital verification perspective. At this moment only Pdf documents support deletion of the specific digital signatures in case of many ones were added. Most documents support deletion of all digital signatures at once without separate certificates removal. It’s strongly recommened to use deletion of electronic digital signatures by signature type Digital. See example [Delete Signatures of the certain type]

Here are the steps to delete Digital signature from the document with GroupDocs.Signature:

• Create new instance of Signature class and pass source document path as a constructor parameter;
• Instantiate DigitalSearchOptions object with desired properties;
• Call Search method to obtain list of DigitalSignature;
• Select from list DigitalSignature object(s) that should be removed from the document;
• Call Signature object Delete method and pass one or several signatures to it.

This example shows how to delete Digital signature that was found using Search method.

import groupdocs.signature as signature
from groupdocs.signature.options import DigitalSearchOptions

# Initialize signature
with signature.Signature("signed.pdf") as sign:
    # Create search options
    options = DigitalSearchOptions()
    
    # Search for digital signatures in the document
    signatures = sign.search(options)
    
    if len(signatures) > 0:
        digital_signature = signatures[0]
        result = sign.delete(digital_signature)
        
        if result:
            print(
                f"Digital signature with certificate subject {digital_signature.certificate.subject} "
                f"was deleted from document ['{fileName}']."
            )
        else:
            print(
                f"Signature was not deleted from the document! "
                f"Digital signature with certificate subject {digital_signature.certificate.subject} "
                f"was not found!"
            )

You may easily run the code above and see the feature in action in our GitHub examples:

• GroupDocs.Signature for Python via .NET examples, plugins, and showcase

Along with the full-featured Python library, we provide simple but powerful free online apps.

To sign PDF, Word, Excel, PowerPoint, and other documents you can use the online apps from the GroupDocs.Signature App Product Family.