1. Open the PDF containing the signature, do one of the followings:
- Choose Protect > Validate.
- Right-click the signature with the Hand command, choose Validate Signature from context menu.
- Select the Hand command on the toolbar and click the signature.
- Click the Digital Signatures panel, right-click the signature and choose Validate Signature.
2. Pop-up a Signature Validation Status message box which describes the validity of signature.