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The paper presents the design of the security layer for a distributed system located in the multizone hierarchical computer network. Depending on the zone from which a client's request comes to the system and the type of the request, it will be either authorized or rejected. There is one common layer for the access to all the business services and interactions between them. Unlike the commonly used RBAC model, this system enforces a multilayer authentication and authorization. Actor's privileges are the result of the user's and the system's roles conjunction with the network zone. Unlike common systems, the privileges are given to a digital identity, not to particular accounts, so that it does not matter which account was used by the user - he will get the same privileges. Such a combination of many smaller ideas and methods results in a new and modern approach to the security aspects of the distributed service oriented systems.