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            A
            
             
              string
             
            
            value
that represents the type of signature used to sign a PDF document.
The
            
             PDFSignatureType
            
            data type is a member of
            
             
              PDFSignatureField
             
            
            and
            
             
              Signature Type
             
            
            data types.
            
           
            These string values are valid:
            
           
            - 
             AUTHORSIG:
            
 
            - 
             The signature field is an author signature field.
            
 
            
             
            - 
             RECIPIENTSIG:
            
 
            - 
             The signature field is another type of signature field.
            
 
            
             
            - 
             XMLSIG:
            
 
            - 
             The signature field is an XML signature field.
            
 
            
             
            - 
             NOSIG:
            
 
            - 
             No signature field exists on the PDF document.
            
 
            
             
            
           
           
          
          
           
          
          
          
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