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• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  6.3 SecureChannel Service Set
  Services are unlike other Services because they are typically not implemented by the OPC UA Application directly. Instead, they are provided by the communication stack that the OPC UA Application ... incoming Messages have been signed and/or encrypted according to the security policy. A UA application is expected to ignore any Message that does not conform to the security policy