public CKR C_EX_GetLicense(NativeULong session,
            NativeULong licenseNum, byte[] license, ref NativeULong licenseLen)
        {
            if (_disposed)
                throw new ObjectDisposedException(GetType().FullName);

            NativeULong rv = _rutokenDelegates.C_EX_GetLicense(session, licenseNum, license, ref licenseLen);

            return (CKR)rv;
        }