The DPSECURITYDESC structure is defined as :-

struct DPSECURITYDESC {
DWORD dwSize;
DWORD dwFlags;
union {
LPWSTR lpszSSPIProvider;
LPSTR lpszSSPIProviderA;
};
union {
LPWSTR lpszCAPIProvider;
LPSTR lpszCAPIProviderA;
};
DWORD dwCAPIProviderType;
DWORD dwEncryptionAlgorithm;
};