To provide data which is capable of insisting a value as an object and being protected from a copy and a change by holding digital content data, extracting a higher-order space frequency components controlling the clarity of an image from data and permitting a decoding means which is not permitted to execute decoding to store it in a data area which does not allow interpretation.
A dynamic image obtained, for example, by compressing a by name image by an MPEG system and audio information exist in an MPEG file 1. An original MPEG system stream is also stored. An encoder 2 scrables the original MPEG system stream, executes scramble MPEG processing, generates an MPEG system stream for distribution, and stores it in a distribution file 3. The encoder 2 receives the original MPEG system stream which is read from the MPEG file 1 in a stream separating part, separates it into image data and audio data and sends them.
GOTO TOMOE
YOSHIZAWA SEIJI
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