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            A complex data type that represents the actions that can
be performed in the PDF document without invalidating the signature.
The
            
             PDFSignaturePermissions
            
            value is a member of
the
            
             
              PDFSignatureVerificationInfo
             
            
            and
            
             
              PDFSignatureVerificationResult
             
            
            data
types.
            
           
            These string values are valid:
            
           
            - 
             All:
            
 
            - 
             All modifications to the PDF document are allowed.
            
 
            
             
            - 
             FormFields:
            
 
            - 
             Only modifications to the form fields are allowed.
            
 
            
             
            - 
             FormFieldsAndComments:
            
 
            - 
             Only modifications to the form fields and comments are allowed.
            
 
            
             
            - 
             None:
            
 
            - 
             Modifications to the PDF document are not allowed.
            
 
            
             
            
           
           
          
          
           
          
          
          
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