Title:
デジタルデータ不正使用防止システム及び再生装置
Document Type and Number:
Japanese Patent JP3556891
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a digital data unauthorized use preventive system which eases restrictions on private copying. SOLUTION: The registration device 101 is provided with a means 102 which receives a personal ID of a user and a device ID that specifies a reproducing device or media, encrypts the personal ID with the device ID, and transmitting an encrypted personal ID to the reproducing device. A distribution device 103 has a means 105 that encrypts digital data with a data key and transmits encrypted data to the reproducing unit, and a means 104 that receives the personal ID of the user, encrypts the data key with the personal ID, and transmits an encrypted data key to the reproducing unit. The reproducing unit 106 is provided with a means 110 for decoding the encrypted personal ID with the device ID to produce the personal ID, a means 111 for decoding the encrypted data key with the personal ID to produce the data key, and a means 112 for decoding the encrypted data with the data key to produce the digital data.
Inventors:
Haruhiko Fujii
Hideaki Takei
Nobuhisa Miyake
Eiji Kuwana
Hideaki Takei
Nobuhisa Miyake
Eiji Kuwana
Application Number:
JP2000290087A
Publication Date:
August 25, 2004
Filing Date:
September 25, 2000
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G06K19/07; G06F12/14; G06F15/00; G06F21/10; G06F21/31; G06F21/60; G06F21/62; G06K19/00; H04L9/08; H04L9/32; (IPC1-7): G06F15/00; G06K19/00; G06K19/07; H04L9/08; H04L9/32
Domestic Patent References:
| JP2000242604A | ||||
| JP895777A | ||||
| JP2000209169A | ||||
| JP11289325A | ||||
| JP383132A | ||||
| JP11328850A | ||||
| JP9297798A |
Other References:
青野正宏,渡辺尚,水野忠則,柔軟な流通を目指したコンテンツ保護システム,マルチメディア,分散,協調とモバイル(DICOMO2000)シンポジウム論文集,2000年 6月28日,第2000巻,第7号,p.535-p.540
庵祥子,玉井誠,三宅延久,曽根岡昭直,不正コピー防止を考慮した情報販売方式,情報処理学会研究報告,1999年 1月22日,第99巻,第4号,p.139-p.144
庵祥子,玉井誠,三宅延久,曽根岡昭直,不正コピー防止を考慮した情報販売方式,情報処理学会研究報告,1999年 1月22日,第99巻,第4号,p.139-p.144
Attorney, Agent or Firm:
Makoto Suzuki