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This paper addresses the problem of access control in the context of unified distributed architectures, in which a local authorization policy is not able to recognize all the terms applicable to the authorization decision requests. The approach is based on semantic interoperability between the different services of the architecture. More specifically, we present the ontologybased interoperation service (OBIS), which calculates the matching of security concepts extracted from access requests and local authorization policies. This service is then validated in an employability use case scenario.