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License management system

A resume and file technology, applied in the field of license management system, can solve problems such as improper repeated input

Inactive Publication Date: 2008-10-01
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, the IC card has no means of confirming that the history file received from the receiver is the correct history file corresponding to the permission of the input object. This topic has been improperly double-entered

Method used

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Embodiment Construction

[0092] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0093] In the present embodiment, the history file for recording the history of input processing of permission performed by the IC card is composed of a plurality of history files. Each history file records the input history of different licenses. Furthermore, the history file and the tamper verification information corresponding to the history file are managed in a tree structure, and this tree structure is called a history management tree.

[0094] Here, the tamper verification information refers to information used to calculate a tamper verification value. The tamper verification value is a value calculated by a one-way function, more specifically, a hash (hash) value or the like, but other values ​​may be used as long as tamper verification is possible.

[0095] The history management tree and history files are stored by the receiver 110 shown in FIG. 1 described ...

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PUM

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Abstract

An IC card can check whether a history file received from a receiver is a correct history file so as to prevent an overlapped input of a license. A server (100) for transmitting a license containing a content use condition includes: a classification key generation unit (101) for generating a classification key containing history file identifiers for uniquely identifying each of history files containing a license input history at the receiver side which is recorded in a distributed way; a license issuing unit (103) for issuing a license containing the content use condition while correlating it with the classification key generated by the classification key generation unit (101); and a server communication unit (104) for transmitting the classification key and the license correlated with the classification key.

Description

technical field [0001] The present invention relates to a license management system in a content distribution system that restricts use of encrypted content based on license usage conditions specified for each content, and the license management system includes a server, a receiver, and an IC card that manage license input history. Background technique [0002] A content distribution service that distributes content in real time or on demand using broadcasting or communication is widely practiced. Especially in Japan, a content distribution service called server-type broadcasting is being planned. [0003] In server-type broadcasting, a server sends encrypted content and encrypted licenses to receivers, and receivers receive and store encrypted content and encrypted licenses from the server. Before reproducing the encrypted content, the receiver sends an encrypted license to an IC (Integrated Circuit: Integrated Circuit) card, and the IC card receives and decrypts the encry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/24G06Q30/00G06Q50/00G06F21/60G06F21/62G06F21/64G06Q10/00
CPCG06F21/10G06F2221/0711G06Q10/06G06Q10/10G06F21/1014
Inventor 佐佐木崇光庭野智平本琢士
Owner PANASONIC CORP
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