A communications system, a communication management system and method are disclosed. Distribution information is distributed to communication terminal devices to which communication lines are connected. And a privilege is assigned to a user of the communication terminal device to which the distribution information is distributed.

 
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< Computer-readable medium with microprocessor to control reading and computer arranged to communicate with such a medium

< Key compression

> Data receiving method and data receiving unit therefor

> Systems and methods for using cryptography to protect secure computing environments
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