Patent ID: 8983074
Filing Date: 2015-03-17
Classification: H04L

Abstract:
1. An input content data managing system, comprising: a first electronic storing apparatus that stores original encoded content data generated by encoding original content data using a cryptographic key; a second electronic storing apparatus that stores the cryptographic key with digest-value data of the original encoded content data and with user identification data for identifying a user who inputs the original content data, the second storing apparatus being controlled separately from the first storing apparatus, the digest-value data having been previously generated from the original encoded content data using a predetermined digest-value-generation-expression, a matching unit that matches the first-storing-apparatus-stored encoded content data and the second-storing-apparatus-stored cryptographic key to determine a matched cryptographic key by using the predetermined digest-value-generation-expression to generate new digest data of the first-storing-apparatus-stored encoded content data, and matching the new digest-value data to the second-storing-apparatus-stored digest-value data to determine the matched second-storing-apparatus-stored cryptographic key, the matched second-storing-apparatus-stored cryptographic key usable to decode the first-storing-apparatus-stored encoded content data to obtain the content data, wherein the system is operative to determine whether a user identified by the user identification data is qualified according to user list data and, when the user identified by the user identification data is determined to be qualified, to send the second-storing-apparatus-stored digest-value data and the corresponding second-storing-apparatus-stored cryptographic key to the matching unit.