DATA PROTECTING DEVICE AND METHOD, DATA REPRODUCING DEVICE, AND DATA RESTORING DEVICE

摘要

PROBLEM TO BE SOLVED: To protect digital contents without losing the convenience of a user.

SOLUTION: An incomplete data generating part 508 extracts fragmental bits from the plurality of parts of original data to generate incomplete data. A key data generating part 506 collects the extracted fragmental bits to generate key data. The incomplete data generating part 508 refers to a list to decide positions where the fragmental bits should be extracted from the original data to extract the fragmental bits from the plurality of parts of the original data.

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