The GetSecurity method is used to retrieve the security descriptor associated with the responder.

 HRESULT GetSecurity(
   [out, ref] CERTTRANSBLOB* pctbSD
 );

pctbSD: This is a pointer to a CERTTRANSBLOB structure that contains the marshaled Security Descriptor. Information on Security Descriptors is documented in [MS-DTYP] section 2.4.6.<21>