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This paper presents an authorization scheme for large-scale networks that involves programming models and tools represented by the Web, Java and CORBA. The authorization scheme is based on structures and concepts introduced in the Web, Java and CORBA for security. A discretionary prototype is presented here, where the solutions adopted involving a concrete scheme are discussed. This scheme was developed in order to simplify authorization policy implementation in these systems. These policies are based on well-known literature security models such as the access matrix model. These security models are adapted in order to elaborate a feasible and practical authorization scheme in which it is easy to define policies to be followed in large-scale distributed systems.