ACCESS CONTROL SYSTEM

摘要

An access control system includes a server (11), an access management database storage device (12), first and second client devices (13 and 15), and data storage devices (14 and 16). The first and second client devices (13 and 15) forms a peer-to-peer file exchange system, and can access the server (11). The access management database storage device (12) stores an access management list. When receiving a request for data from the second client device (15), the first client device (13) inquires the server (11) about whether the requested data can be accessed. The server (11) determines whether the data can be accessed by using the access management list.