METHOD FOR PREVENTING COPYING OF DIGITAL SIGNAL

摘要

PROBLEM TO BE SOLVED: To prevent the copying of information which is distributed after adapting a conditional access system regardless of the distribution spot of the information.

SOLUTION: A copying preventing means is easily mounted, and provides an excellent effect such as a "curb-high" solution. The "curb-high" solution is different from the access method by conventional technique, and provides a wide range of security levels from the minimum security level to the drastically high level security through the use of a relatively small amount of system resources.

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