コンテンツ配信・再生方法、コンテンツ配信・再生システム、その管理装置及び再生装置 - Nippon Telegraph and Telephone Corporation

Title:

コンテンツ配信・再生方法、コンテンツ配信・再生システム、その管理装置及び再生装置

Document Type and Number:

Japanese Patent JP4663242

Kind Code:

B2

Abstract:

To share one content between terminals of the same attribute and to provide one terminal with a plurality of attributes.

A management device holds identification information of a reproducing device and attribute information of the reproducing device by every piece of identification information as one group and the reproducing device holds encrypted attribute information in which the attribute information of the reproducing device is encrypted by the identification information. At the time of content distribution, when the management device receives the attribute information and a content ID from the reproducing device, the management device transmits an encrypted content in which a content is encrypted by an encryption key and an encrypted encryption key in which the encryption key is encrypted by the attribute information to the reproducing device, at the time of content reproduction, the reproducing device acquires the attribute information from the identification information and the encrypted attribute information, acquires the encryption key from the attribute information and the encrypted encryption key, acquires the content from the encryption key and the encrypted content and reproduces it.

Inventors:

Haruhiko Fujii
Youichi Kihara
Shionoiri

Application Number:

JP2004003568A

Publication Date:

April 06, 2011

Filing Date:

January 09, 2004

Export Citation:

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Assignee:

Nippon Telegraph and Telephone Corporation

International Classes:

G06F12/14; H04L9/08; G06F15/00; G06F21/00; G06F21/10; G06F21/33; G06F21/60; G06F21/62

Domestic Patent References:

JP2002099514A
JP2003188868A
JP2003264539A
JP2003249926A
JP2001067270A
JP2003281096A
JP2003284031A
JP2003101525A

Foreign References:

WO2003105002A1

Other References:

藤井治彦 Haruhiko FUJII,自由度の高い私的コピーを実現する著作権保護方式 A New Method of Copyright Protection Enabling Less Restricted Personal Copy,情報処理学会研究報告 Vol.2001 No.17 IPSJ SIG Notes,日本,社団法人情報処理学会 Information Processing Society of Japan,2001年 2月24日,第2001巻第17号,p.39~46
庵祥子 Shoko Ihori,デジタルコンテンツの階層的な情報利用制御方法,第61回(平成12年後期)全国大会講演論文集(3) データベースとメディアネットワーク,社団法人情報処理学会,2000年10月 3日,3-45~3-46
藤井治彦,コンテンツの私的コピーを考慮した著作権保護方式,第61回(平成12年後期)全国大会講演論文集(4),社団法人情報処理学会,2000年10月 3日,p.4-271~4-272

Attorney, Agent or Firm:

Makoto Suzuki

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