| 摘要 |
Digital information is protected by holding it on durable hardware. In a system that uses a hardware mechanism to move digital information without permitting reproduction, a record concerning a movement of the digital information, that is, a transfer history, is stored. When recovering the digital information, by analyzing the transfer history, it can be indicated at what time alteration of hardware reproduced the identification. By using a nested structure as the data structure of the transfer history, durability against falsification of the transfer history by a misuser during distribution is also realized while the number of calculations required for transfer history check in each transfer is set to a fixed value which does not depend on the number of transfers.
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