EP0704785A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Data copyright management system
Assignee: Mitsubishi Corp
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Filing: 1995-09-25
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Granted: —
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Expires: 2015-09-25
Abstract
Abstract A data copyright management system comprises a database for storing original data, a key control center for managing crypt keys, copyright management center for managing data copyrights, and a communication network for connecting these sections each other; data supplied from the database to users is encrypted and distributed, and the users decrypting the encrypted data by crypt keys obtained from the key control center or copyright management center to use the data. To supply data to users, there are the following two methods: one for one-way supplying encrypted data to users by means of broadcasting or the like, and the other for two-way supplying encrypted data to users corresponding to users' requests. A crypt key system used for encrypting data uses a secret-key cryptosystem, a public-key cryptosystem or a cryptosystem combining a secret-key and a public-key and moreover, uses a copyright management program for managing data copyrights. When a user stores, copies, or transfers data, the data is encrypted by a crypt key different from a crypt key used for supplying the data. The former crypt key is supplied from the key control center or from the copyright management center, or generated by the copyright management program. Moreover, the present invention can be applied to a data copyright management system for using not only signal data but also a plurality of data supplied from a single database or a plurality of data supplied from a plurality of databases. Furthermore, an apparatus to be used by the user to perform data copyright management is also proposed.
Inventors
- 👤 Makoto Saito
- 👤 Shunichi Momiki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 08:21
CPC Classifications
G; G06; G06Q; G06Q20/00; G06F; G06F21/00; G06F21/10; G06F21/16; G06Q20/02; G06Q20/08; G06Q20/12; G06Q20/123; G06Q20/1235; G06Q20/38; G06Q20/382; G06Q20/3823; G06Q20/3829; G07; G07F; G07F7/00; G07F7/08; G07F7/10; G07F7/1016; H; H04; H04L; H04L63/00; H04L63/04; H04L63/0428; H04L63/0442; H04L63/0464; H04L63/06; H04L63/062; H04L63/10; H04L63/104; H04L63/12; H04L63/126; H04L9/00; H04L9/08; H04L9/0816; H04L9/0819; H04L9/083; H04L9/088; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/235; H04N21/2351; H04N21/25; H04N21/254; H04N21/2541; H04N21/266; H04N21/26613; H04N21/40; H04N21/43; H04N21/44; H04N21/4405; H04N21/4408; H04N21/45; H04N21/462; H04N21/4627; H04N21/80; H04N21/83; H04N21/835; H04N7/00; H04N7/16; H04N7/167; H04N7/1675; G06F2211/00; G06F2211/007; H04L2209/00; H04L2209/56; H04L2209/60; H04L2209/603; H04L2209/605; H04L2463/00; H04L2463/101
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
91 words
Data copyright management system for managing the copyright of encrypted data supplied from a database to a user, said data copyright management system having the database 1 and a key control center 9; wherein a key for decrypting said encrypted data is supplied from said key control center 9 to said user; said user uses said key for decrypting when said user displays or editssaid data to decrypt said encrypted data; and said data is re-encrypted when said user stores, copies or transfers said data or data which has been edited.
Claim 2
Dependent Claim
22 words
Data copyright management system according to claim 1 wherein said key used in said reencryption is different from said key for decryption.
Claim 3
Dependent Claim
25 words
Data copyright management system according to claim 1 or 2 wherein a copyright management program is further used for managing the copyright of said data.
Claim 4
Dependent Claim
49 words
Data copyright management system according to one of the preceding claims, wherein a data copyright management program is stored in a memory, selected from a ROM of a device which said user uses and a system area controlled by an operating system of the device which said user uses.
Claim 5
Dependent Claim
28 words
Data copyright management system according to one of the preceding claims, wherein further a copyright information which is not encrypted with respect to said data copyright is used.
Claim 6
Dependent Claim
48 words
Data copyright management system according to any of the preceding claims, wherein said non-encrypted copyright information is added to said encrypted data as a copyright information label, said copyright information label being stored, copied or transmitted together with said data if said data is stored, copied or transmitted.
Claim 7
Dependent Claim
19 words
Data copyright management system according to claim 6 wherein a digital signature is added to said copyright information label.
Claim 8
Dependent Claim
192 words
Data copyright management system for using data encrypted and supplied from a database to a user, comprising the database 1, a key control center 9 and a copyright management center 10; wherein said data copyright management system uses secret-key, user information and copyright management program; said database 1 encrypts the data with a first secret-key to distribute the data to a first user 4 via communication network 8, communication and broadcasting satellite 2 and record medium 3; said first user 4 provides the first user information to said key control center 9 to request the use; said key control center 9 transfers said first user information to said copyright management center 10; said key control center 9 transfers the copyright management program together with said first secret-key and second secret-key to said first user 4 via said communication network 8; said first user 4 uses said first secret-key with said copyright management program to decrypt said encrypted data for use; and said data decrypted is re-encrypted if said decrypted data is stored, copied or transmitted with said copyright management program by using said second secret-key, and uncrypted first user information is added.
Claim 9
Dependent Claim
64 words
Data copyright management system according to claim 8 wherein said first secret-key and said second secret-key are disused with said copyright management program, when said decrypted data is copied or transmitted; and said first user 4 requests for the retransfer of said second secret-key for the reuse of said reencrypted data to said copyright management center 10 so that said second secret-key is retransmitted.
Claim 10
Dependent Claim
33 words
Data copyright management system according to claim 9 wherein the copy or transmit of said encrypted data is registered in said copyright management center 10 according to the retransfer of said second secret-key.
Claim 11
Dependent Claim
107 words
Data copyright management system according to claim 9 or 10 wherein second user 5 presents said first user information to request the use to said copyright management center 10; said copyright management center 10 transfers said second secret-key and third secret-key, and said copyright management program to said second user 5 after confirming the retransfer of said second secret-key to said first user 4; said second user 5 decrypts said encrypted data with said copyright management program by using said second secret-key; and said data is reencrypted and redecrypted with said copyright managementprogram by using said third secret-key when said decrypted data is stored, copied or transmitted.
Claim 12
Dependent Claim
47 words
Data copyright management system according to claim 8, 9, 10 or 11 wherein said second secret-key is generated on the basis of any one or more of said first secret-key, said user information, and the usage frequency of said copyright management program with said copyright management program.
Claim 13
Dependent Claim
200 words
Data copyright management system for using data encrypted and supplied from a database to a user, said data copyright management system comprising a database 1, a key control center 9 and a copyright management center 10; wherein said data copyright management system uses secret-key, user information and copyright management program; first user 4 presents the first user information to the database 1 to request the use of the data; said database 1 encrypts said requested data by using first secret-key and transfers it to said first user 4 via said communication network 8 together with said first secret-key, second secret-key and said copyright management program; said key control center 9 transfers said first user information to said copyright management center 10; said key control center 9 transfers the copyright management program together with said first and second secret-keys to said first user 4 via said communication network 8; said first user 4 decrypts and uses said encrypted data with said copyright management program by using said first secret-key; and said decrypted data is re-encrypted when said decrypted data is stored, copied or transmitted with said copyright management program by using said second secret-key, and uncrypted first user information is added.
Claim 14
Dependent Claim
57 words
Data copyright management system according to claim 13 wherein said first and second secret-keys are disused with said copyright management program when said decrypted data is copied or transmitted; said first user 4 requests retransfer of said second secret-key for thereuse of the reencrypted data to said copyright management center 10; and said second secret-key is retransferred.
Claim 15
Dependent Claim
33 words
Data copyright management system according to claim 14 wherein the copy or transmit of said encrypted data is registered in said copyright management center 10 according to the retransfer of said second secret-key.
Claim 16
Dependent Claim
110 words
Data copyright management system according to claim 14 or 15 wherein second user 5 presents said first user information to request the use to said copyright management center 10; said copyright management center 10 transfers said second secret-key, third secret-key and said copyright management program to said second user 5 after confirming the retransfer of said second secret-key to the first user 4; said second user 5 decrypts said encrypted data with said copyright management program by using said second secret-key; and said data is reencrypted and redecrypted with said copyright management program by using said third secret-key in the case where said decrypted data is stored, copied or transmitted.
Claim 17
Dependent Claim
47 words
Data copyright management system according to claim 13, 14, 15 or 16 wherein said second secret-key is generated on the basis of any one or more of said first secret-key, said user information, and the usage frequency of said copyright management program with said copyright management program.
Claim 18
Dependent Claim
187 words
Data copyright management system for using data encrypted and supplied from a database to a user, comprising a database 1, a key control center 9 and a copyright management center 10; said data copyright management system uses secret-key, public-key and private-key; first user 4 presents first public-key, second public-key and first user information to request the use of the desired data to said key contrl center 9; said database which receives the request for use encrypts said data by using first secret-key, encrypts said first secret-key by using said first public-key, and encrypts second secret-key by using said second public-key; said encrypted data, said encrypted first secret-key, said encrypted second secret-key and said copyright management program are transmitted to said first user; said first user decrypts said encrypted first secret-key by using first private-key, decrypts said encrypted data by using said decrypted first secret-key, and decrypts said encrypted second secret-key by using second private-key, with said copyright management program; said data is encrypted and decrypted with said copyright management program by using the second secret-key in the case where said decrypted data is stored, copied or transmitted.
Claim 19
Dependent Claim
65 words
Data copyright management system according to claim 18 wherein said first and second secret-keys are disused with said copyright management program when said decrypted data is copied or transmitted; said first user 4 who reuses said encrypted data requests for the retransfer of said second secret-key for the reuse of said reencrypted data to said copyright management center 10; and said second secret-key is retransferred.
Claim 20
Dependent Claim
25 words
Data copyright management system according to claim 19 wherein the copy or transmit of said encrypted data is registered in said copyright management center 10.
Claim 21
Dependent Claim
110 words
Data copyright management system according to claim 19 or 20 wherein second user 5 presents said first user information to request the use to said copyright management center 10; said copyright management center 10 transfers said second secret-key, third secret-key, and said copyright management program to said second user 5 after confirming the retransfer of said second secret-key to said first user 4; said second user decrypts said encrypted data with said copyright management program by using said second secret-key; and said data decrypted is reencrypted and redecrypted with said copyright management program by using said third secret-key in the case where said decrypted data is stored, copied or transmitted.
Claim 22
Dependent Claim
40 words
Data copyright management system according to claim 18 - 22 wherein said second secret-key is generated on the basis of any one or more of said first secret-key, said user information, and the usage frequency of said copyright management program.
Claim 23
Dependent Claim
206 words
Data copyright management system for using a plurality of data encrypted each by different secret-keys and supplied from database to a user, said system using a sycret-key, user information and a copyright management program, comprising: first user 4 obtaining from a copyright management center 10 a plurality of copyright management programs unique to original said plurality of data anda plurality of first secret-keys to decrypt said plurality of original data with a plurality of said first secret-keys; one or a plurality of second secret-keys being generated with a plurality of copyright management programs unique to said plurality of original data; wherein said plurality of original data which are used or edited are encrypted with said one or a plurality of second secret-keys with said plurality of copyright management programs unique to said plurality of original data to be stored, copied or transmitted together with the edition process data; and said plurality of original data or said plurality of edited data encrypted with said one or plurality of second secret-keys are decrypted with said one or plurality of second secret-keys and said plurality of copyright management programs obtained from said copyright management center 10 for second user 5 to use and edit by using said edition process.
Claim 24
Dependent Claim
35 words
Data copyright management system according to claim 23 wherein said second secret-key is generated with said copyright management program on the basis of any one or more of said first secret-keys and said user information.
Claim 25
Dependent Claim
119 words
Data copyright management system for using data encrypted and supplied from a database 1 to a user, using a crypt key, user information and a copyright management program, comprising: said user presenting user information to said database 1; said database 1 supplying said data encrypted with first crypt key to first user; said first user generating a second crypt key based on said first crypt key with said copyright management program; said encrypted data being decrypted by using said first crypt key in the case where said first user uses said encrypted data; and said decrypted data being reencrypted by using said second crypt key in the case where said first user stores, copies or transmits said decrypted data.
Claim 26
Dependent Claim
26 words
Data copyright management system according to claim 25 wherein said crypt key is selected from the group comprising a secret-key and a public-key and a private-key.
Claim 27
Dependent Claim
92 words
A digital cash management system for using digital cash encrypted and supplied from a financial organization to first user, comprising: said financial orginization supplying a key for decrypting said encrypted digital cash data to said first user; Decrypting of said digital cash data by using said decrypting key in the case where said first user confirms said digital cash data; and Reencrypting said data if said first user stores said decrypted digital cash data, if changed digital cash data is stored, or if digital cash data is transmitted to said second user.
Claim 28
Dependent Claim
27 words
A digital cash management system according to claim 27 wherein the key used in said reencryption is a crypt key which is different from said decrypting key.
Claim 29
Dependent Claim
25 words
A digital cash management system according to claim 27 or 28 wherein further a digital cash management program is used for managing said digital cash.
Claim 30
Dependent Claim
22 words
A digital cash management system according to claim 27, 28 or 29 wherein further a not encrypted first user information is used.
Claim 31
Dependent Claim
70 words
A digital cash management system according to claim 27, 28, 29 or 30 wherein said not-encrypted first user information is added to said encrypted digital cash data as the first user information label to be stored or transmitted together with said digital cash data if said digital cash data is stored, if changed digital cash data is stored, or if said digital cash data is transmitted to the second user.
Claim 32
Dependent Claim
21 words
A digital cash management system according to claim 31 wherein a digital signature is added to said first user information label.
Claim 33
Dependent Claim
239 words
A digital cash management system for using digital cash encrypted and supplied from a financial organization to a first user, said system using a crypt key, user information and digital cash management program, comprising: said first user presenting the first user information to said financial organization; said financial organization providing said first user with said digitalcash data encrypted by the first crypt key; wherein said first user generates a second crypt key on the basis of said first crypt key with said digital cash management program; said encrypted digital cash data is decrypted by using said first crypt key in the case where said first user confirms said encrypted digital cash data; said digital cash data decrypted is reencrypted by using said second crypt key to be stored said first user; said decrypted digital cash data is reencrypted by using said second crypt key and said digital cash data reencrypted is transmitted to second user together with said first user information in the case where said decrypted digital cash data is transmitted to said second user; said first user information is presented to said financial organization from said second user; said financial organization generates said second crypt key based on said first user information and transfers said second crypt key to said second user; and said second user decrypts said reencrypted digital cash data with said digital cash management program by using said second crypt key which is transferred.
Claim 34
Dependent Claim
27 words
A digital cash management system according to claim 33 wherein said crypt key is selected from the group comprising a secret-key and a public-key and a private-key.
Claim 35
Dependent Claim
111 words
A digital cash management system for using a digital cash encrypted and supplied from a financial organization to first user, said system using a public-key and a private-key, comprising: said first user presenting first public-key to said financial organization; said financial organization encrypting digital cash data with said first public-key to supply to said first user; said first user decrypting said digital cash data by using first private-key; second user presenting second public-key to said first user; said first user encrypting said digital cash data which is decrypted with said second public-key to transfer to said second user; and said second user decrypting said digital cash data by using second private-key.
Claim 36
Dependent Claim
106 words
A video conference data management system for using video conference data encrypted and supplied from first user to second user, comprising: a key for decrypting said encrypted video conference data being supplied from said first user to said second user; said encrypted video conference data being decrypted by using said decrypting key in the case where said second user uses said video conference data; and said data being reencrypted in the case where said second user stores decrypted said video conference data, in the case where edited video conference data is stored, or in the case where said video conference data is transmitted to third user.
Claim 37
Dependent Claim
24 words
A video conference data management system according to claim 36 wherein a crypt key used for said re-encryption is different from said decrypting key.
Claim 38
Dependent Claim
29 words
A video conference data management system according to claim 36 or claim 37 wherein a video conference data management program for managing said video conference data is further used.
Claim 39
Dependent Claim
21 words
A video conference data management system according to claim 35, 36 or 37 wherein further non-encrypted first user information is used.
Claim 40
Dependent Claim
80 words
A video conference copyright management system according to claim 36, 37, 38 or 39 wherein said uncrypted first user information is added to said encrypted video conference data as the first user information label which is copied or transmitted together with said video conference data in the case where said video conference data is stored, in the case where the edited video conference data is stored, or in the case where the video conference data is transmitted to third user.
Claim 41
Dependent Claim
22 words
A video conference data management system according to claim 40 wherein a digital signature is added to said first user information label.
Claim 42
Dependent Claim
142 words
A video conference data management system for using video conference data encrypted and supplied from first user to second user, said system using a crypt key, user information, and video conference data management program: wherein said second user presents second user information to said first user; said first user supplies to said second user said video conference data encrypted with the first crypt key; said second user uses said video conference data management program to generate the second crypt key based on said first crypt key; said encrypted video conference data is decrypted by using said first crypt key in the case where said second user uses said encrypted video conference data; and said decrypted video conference data is reencrypted by using said second crypt key in the case where said second user stores, copies or transmits said decrypted video conference data.
Claim 43
Dependent Claim
28 words
A video conference data management system according to claim 42 wherein said crypt key is selected from the group concerning a secret-key and a public-key and a private-key.
Claim 44
Dependent Claim
79 words
Data copyright management apparatus connected for use to a system bus in main body of user terminal, comprising a microprocessor, a read only memory, reading and writing memory and EEPROM connected to a microprocessor bus: said read only memory storing fixed information such as database utilization software and user data or the like; and said EEPROM storing first crypt key, second crypt key and a copyright management program supplied from a key control center or a copyright management center.
References Cited (Backward Citations)
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