a terminal authorization certificate table that stores the second terminal authorization certificate indicating access rights of the terminal for a network that is shared by a plurality of terminals including the terminal and the second terminal authorization certificate is used by {TAIL ~ each} of the plurality of {HEAD ~ terminals} to determine access rights to the network 
a terminal authorization certificate table that stores the second terminal authorization certificate indicating access rights of the terminal for a network that is shared by a plurality of terminals including the terminal and the second terminal authorization certificate is used by { TAIL ~ each } of the plurality of { HEAD ~ terminals } to determine access rights to the network
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