SCRAMBLE BROADCAST SYSTEM, SCRAMBLE BROADCAST METHOD, SCRAMBLER AND DESCRAMBLER

摘要

PURPOSE: To inhibit program viewing for each reception terminal equipment by setting a group to a reception terminal equipment. CONSTITUTION: Individual information sent from a broadcast source is decoded based on an individual key specific to a reception terminal equipment at a 1st decoder 23 of the reception terminal equipment and a group number and a work key are extracted. A broadcast program sent from the broadcast source is fed to a descrambler 21, program information attended with the broadcast program is decoded based on the work key at a 2nd decoder 22 and a scramble key and group designation information are extracted. When the group number designated by the group designation information and a group number included in the individual information fed from the broadcast source are coincident, the scramble key is not fed to the descrambler 21 and the broadcast program is not descrambled.