Title:
データ著作権管理システム
Document Type and Number:
Japanese Patent JP4101263
Kind Code:
B2
Abstract:
A system is provided which manages the copyright of a plurality of data in a database. A data copyright management system is provided in which a pritnary user edits data which he or she obtains and supplies edited data to a secondary user. In a case where new data is produced by editing a plurality of encrypted data obtained from the database, and is encrypted for distribution to another person, crypt keys for a plurality of data as raw material and an edition program which is an editing process with a digital signature are used as a use permit key. When a user who receives the edited and encrypted data requests use of the data by presenting the digital signature to a copyright management center, the copyright management center identifies the editor by the digital signature, and provides the user requiring use of data with the crypt key for use only when the editor is identified to be the valid user of the edited data. The system comprises a database and a key control center, and uses a primary copyright label, a first use permit key including a first crypt key, a second use permit key, a third crypt key, and a copyright management program. The primary user uses primary copyrighted data encrypted by using the first crypt key and supplied, by decrypting it with the first use permit key obtained from the key control center. The data is encrypted again by using the first use permit key when it is stored. The primary user edits the primary copyrighted data by obtaining a second use permit key from the key control center for editing the primary copyrighted data. The data being edited is encrypted and stored by using the second use permit key. At the completion of the editing, the primary user receives the third crypt key for secondary copyright as secondary exploitation right, encrypts the edited data with the third crypt key, and distributes it to a secondary user. The secondary user obtains the third crypt key and uses the edited data. In another system, in a case where a new data is produced by editing a plurality of data obtained from the database, and encrypted for distribution to another person, crypt keys for a plurality of data as raw material and an edition program which is as an editing process with a digital signature are used as a use permit key. When a user who receives the edited and encrypted data requests use of the data by presenting the digital signature to a copyright management center, the copyright management center identifies the editor by the digital signature, and provides the user requiring data use with a crypt key for use only when the editor is identified to be the valid user of the edited data.
Inventors:
Makoto Saito
Hayaki Hayashi
Hayaki Hayashi
Application Number:
JP2005298846A
Publication Date:
June 18, 2008
Filing Date:
October 13, 2005
Export Citation:
Assignee:
Intersia Software LLC
International Classes:
G06F1/00; G06F15/00; G06F21/00; G06F21/10; G06F21/62; G09C1/00; H04L9/08; H04L9/30; H04L9/32; H04L29/06; H04N1/44; H04N5/913; H04N7/16
Domestic Patent References:
| JP8329011A | ||||
| JP7302244A | ||||
| JP4181282A | ||||
| JP8292976A | ||||
| JP10512074A |
Other References:
関一則、榊原裕之、岡田謙一、松下温,暗号を利用した新しいソフトウェア流通形態の提案,情報処理学会研究報告(93-IS-45-3),1993年 7月20日,第93巻,第64号,p.19-p.28
大瀧保広、森亮一,超流通における暗号化の手法について,電子情報通信学会技術研究報告(ISEC90-49),1991年 3月 8日,第90巻,第460号,p.33-p.42
大瀧保広、森亮一,超流通における暗号化の手法について,電子情報通信学会技術研究報告(ISEC90-49),1991年 3月 8日,第90巻,第460号,p.33-p.42
Attorney, Agent or Firm:
Yasuo Ishikawa