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• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  5.7.2.2 Parameters
  securityPolicyUri is None, the Server shall ignore the ApplicationInstanceCertificate . If the SecurityMode is not None, a Client shall prove possession by using the private key to create a Signature using ... Nonce provided by the Server in the response. If the SecurityMode is not None, the Server shall verify that this ApplicationInstanceCertificate is the same as the one it used