Consider a system in which "co

Set up a dynamic protection structure that changes the set of resources available with respect to the time allotted to the three categories of users.As time changes,so does the domain of users eligible to play the computer games.When the time comes that a user's eligibility is over,a revocation process must occur.Revocation could be immediate,selective (since the computer staff may access it at any hour),total,and temporary (since rights to access will be given back later in the day).