In the near future, people will be able to access information and resources on the public open network environment. However, few current network environments seem to have unified method for protection of information and resource. This paper proposes a unified resource protection scheme on the basis of fusion of two multi-agent systems called Kodama and VPC. Kodama has the power of constructing flexible hierarchical logical spaces, and VPC has the ability to dynamically change its behavior according to the circumstance of user. As a protection scheme, two kinds of policies called public policy and private policy are introduced into the fused multi-agent system. Combination of these policies makes it possible to realize an open and secure information sharing system. We show practical sample applications using the scheme.