The first step of accessing computer systems is typing in a user ID and a password. The user management system of the computer system then authenticates the user. Only after authentication is the user allowed to access the computer system. In addition to authentication, authorization is also performed by user management systems. For Internet TV systems, authorization is extremely important because Internet TV channels and videos should only be accessed by authorized users. Furthermore, user

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... gement systems record who accessed which TV channels and videos when and how long. This information is used by the billing system. Therefore, we develop a user management system for Internet TV systems. Our user management system controls accessing resources based on the roles of the user.