SCRAMBLER AND DATA MULTIPLEXING METHOD

摘要

PROBLEM TO BE SOLVED: To allow other recipients than a regular recipient to view data where part of objects is missing by setting a scramble mode to each of multiplexed object data. SOLUTION: Data corresponding to an image object A in a scrambler 11 are not scrambled but data corresponding to only image objects B, C are scrambled and outputted. A descrambler 12 conducts inverse processing of the scrambler 11 and recovers the data. In this case, a scramble signal is analyzed by a CPU 121 and each of object data are fed to cipher decoders 123-125 via a demultiplexer 122. The scramble mode of the object data to be added are analyzed by a CPU 121, which sets the scramble mode to the decoders 123-125 and the data are descrambled by using a scramble key in the separate scramble modes.