Patent Document ID: 8218188
Application ID: 11153418

Base Claim:
1. An electronic document storage apparatus for storing an electronic document, comprising: an electronic document storage unit for storing a registered electronic document for a specified period of time; an electronic document management unit for storing at least a status, a date of registration and an access history of the registered electronic document; a transfer process unit for transferring to an archive media an electronic document registered prior to a defined date from among electronic documents stored in the electronic document storage unit by referring to information stored in the electronic document management unit; and a key management unit decodes reference history information encoded by an electronic document reference apparatus and stored in the archive media, by using a write key paired with a read key used for encoding the reference history information, where the reference history information indicates reference to the electronic document, and wherein the transfer process unit calculates a hash value of the electronic document, and after encoding the calculated hash value using the write key used when the key management unit encodes the electronic document, stores the encoded hash value in the archive media, the electronic document reference apparatus calculates a hash value of the electronic document stored in the archive media, and decodes the electronic document stored in the archive media using the read key stored in a for-reference management information emigration media when the calculated hash value matches a hash value obtained by decoding the hash value stored in the archive media using the read key stored in the for-reference management information emigration media, the write key and the read key are configured to be changed at a specified timing, and the electronic document reference apparatus decodes the electronic document stored in the archive media by using the read key paired with the write key used when the electronic document was transferred by the transfer process unit.

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Claim 2:
2. The electronic document storage apparatus according to claim 1 , further comprising a temporary restoration process unit for reading said electronic document transferred by said transfer process unit out of said archive media into an electronic document temporary restoration unit; and an electronic document temporary restoration unit for storing an electronic document read out of the archive media by the temporary restoration process unit.