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An object is a unit of resource distributed in a peer-to-peer (P2P) overlay network. Service supported by an object is modeled to be a set of methods. It is critical to discuss which peer can manipulate an object in which method, i.e. only a peer granted an access right (permission) can manipulate an object. First, an application has to find target peers which can manipulate a target object. In this paper, we take an acquaintance approach to finding and manipulating objects. Here, it is critical to discuss how much a peer trusts each acquaintance peer. We define the trustworthiness of each acquaintance peer in terms of how satisfiable a response from the peer is for each access request.