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diff --git a/OldMdePkg/Include/Ppi/Security.h b/OldMdePkg/Include/Ppi/Security.h
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+/** @file
+  This file declares Security Architectural PPI.
+
+  Copyright (c) 2006, Intel Corporation                                                         
+  All rights reserved. This program and the accompanying materials                          
+  are licensed and made available under the terms and conditions of the BSD License         
+  which accompanies this distribution.  The full text of the license may be found at        
+  http://opensource.org/licenses/bsd-license.php                                            
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             
+
+  Module Name:  Security.h
+
+  @par Revision Reference:
+  This PPI is defined in PEI CIS.
+  Version 0.91.
+
+**/
+
+#ifndef __SECURITY_PPI_H__
+#define __SECURITY_PPI_H__
+
+#define EFI_PEI_SECURITY_PPI_GUID \
+  { \
+    0x1388066e, 0x3a57, 0x4efa, {0x98, 0xf3, 0xc1, 0x2f, 0x3a, 0x95, 0x8a, 0x29 } \
+  }
+
+typedef struct _EFI_PEI_SECURITY_PPI  EFI_PEI_SECURITY_PPI;
+
+/**
+  Allows the platform builder to implement a security policy in response 
+  to varying file authentication states.
+
+  @param  PeiServices    Pointer to the PEI Services Table.
+  @param  This           Interface pointer that implements the particular EFI_PEI_SECURITY_PPI instance.
+  @param  AuthenticationStatus 
+                         Status returned by the verification service as part of section extraction.
+  @param  FfsFileHeader  Pointer to the file under review.
+  @param  DeferExecution Pointer to a variable that alerts the PEI Foundation to defer execution of a PEIM.
+
+  @retval EFI_SUCCESS           The service performed its action successfully.
+  @retval EFI_SECURITY_VIOLATION The object cannot be trusted
+
+**/
+typedef
+EFI_STATUS
+(EFIAPI *EFI_PEI_SECURITY_AUTHENTICATION_STATE) (
+  IN EFI_PEI_SERVICES             **PeiServices,
+  IN EFI_PEI_SECURITY_PPI         *This,
+  IN UINT32                       AuthenticationStatus,
+  IN EFI_FFS_FILE_HEADER          *FfsFileHeader,
+  IN OUT BOOLEAN                  *StartCrisisRecovery
+  );
+
+/**
+  @par Ppi Description:
+  This PPI is installed by some platform PEIM that abstracts the security 
+  policy to the PEI Foundation, namely the case of a PEIM's authentication 
+  state being returned during the PEI section extraction process. 
+
+  @param AuthenticationState
+  Allows the platform builder to implement a security policy in response 
+  to varying file authentication states.
+
+**/
+struct _EFI_PEI_SECURITY_PPI {
+  EFI_PEI_SECURITY_AUTHENTICATION_STATE  AuthenticationState;
+};
+
+extern EFI_GUID gEfiPeiSecurityPpiGuid;
+
+#endif