EP0715241A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Apparatus for data copyright management system

Assignee: Mitsubishi Corp

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Filing: 1995-10-21

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Granted: —

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Expires: 2015-10-21

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Abstract

Abstract A data copyright management apparatus is used with a user terminal and comprises a CPU, a CPU bus, ROM, EEPROM, and RAM. The CPU, ROM, EPROM, and RAM are connected to the CPU bus, and a system bus of a device which utilizes the data can be connected to the CPU bus. A data copyright management system program, crypt algorithm, and user information are stored in the ROM, and a second private-key, a permit key, a second secret-key, and copyright information are stored in the EEPROM. A first public-key, a first private-key, a second public-key, and a first secret-key are transmitted to the RAM during the operation. The data copyright management apparatus may be configured in the form of a monolithic or hybrid IC, a thin IC card, PC card, and insertion board which have a unique terminal. If a copyright management program is supplied from the external, the it is stored in the EEPROM, otherwise it is stored in the ROM. In addition to a microprocessor of user terminal which decrypts encrypted data for displaying and processing and re-encrypts the decrypted data for storing, copying, or transferring, at least one microprocessor, desirably two microprocessors, are added for decrypting and re-encrypting data which is encrypted and supplied. The microprocessors to be added may be connected to a system bus of the microprocessor of the user terminal, it is desirable that a multiprocessor configuration is implemented by using a SCSI bus, PCI bus, or SCI bus. Apparatus for decryption and re-encryption may be configured separately or as a unit. Device which is used to input and output encrypted data may be connected directly to the apparatus for decryption and re-encryption. The data copyright management apparatus may be implemented in the form of a monolithic IC, a hybrid IC, or a built-in subboard, and the apparatus in these forms is incorporated in a computer, television set, set-top box, digital video tape recorder, digital video disk recorder, digital audio tape apparatus, or personal digital assistants, and the like.

Inventors

👤 Makoto Saito
👤 Shunichi Momiki

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-02 02:33

CPC Classifications

G; G06; G06Q; G06Q20/00; G06F; G06F21/00; G06F21/10; G06F21/109; G06Q20/02; G06Q20/04; G06Q20/06; G06Q20/08; G06Q20/12; G06Q20/123; G06Q20/1235; G06Q20/30; G06Q20/36; G06Q20/363; G06Q20/38; G06Q20/382; G06Q20/3823; G06Q20/3829; G06T; G06T1/00; G06T1/0021; G07; G07F; G07F7/00; G07F7/08; G07F7/0866; G07F7/10; G07F7/1016; H; H04; H04L; H04L63/00; H04L63/04; H04L63/0428; H04L63/0442; H04L63/0464; H04L63/06; H04L63/062; H04L63/12; H04L63/126; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/234; H04N21/2347; H04N21/25; H04N21/254; H04N21/2541; H04N21/40; H04N21/41; H04N21/418; H04N21/4181; H04N21/426; H04N21/43; H04N21/433; H04N21/4334; H04N21/44; H04N21/4405; H04N21/4408; H04N21/45; H04N21/462; H04N21/4623; H04N21/4627; H04N21/80; H04N21/83; H04N21/835; H04N7/00; H04N7/16; H04N7/167; H04N7/1675; G06F2211/00; G06F2211/007; G06F2211/008; G06F2221/00; G06F2221/21; G06F2221/2107

Claims Analysis

Total Claims: 8

Claim 1

Independent Claim 149 words

A data copyright management apparatus used with a user terminal for utilizing digital data, said digital copyright management apparatus comprising a central processing unit, a central processing unit bus, read-only semiconductor memory, electrically erasable programmable memory, and read/write memory; wherein, said central processing unit, said read-only semiconductor memory, said electrically erasable programmable memory, and read/write memory are connected to said central processing unit bus, and a system bus of said user terminal is able to be connected to said central processing unit bus; a data copyright management system program, a copyright management program, and user information are stored in said read-only semiconductor memory; a second private-key, a permit key, a second secret-key, a copyright management program, and copyright information are stored in said electrically erasable programmable memory; and a first public-key, a first private-key, a second public-key, and a first crypt-key are transmitted to said read/write memory during operation.

Claim 2

Dependent Claim 148 words

A data copyright management apparatus used with a user terminal for utilizing digital data, said data copyright management apparatus comprising a central processing unit, a central processing unit bus, read-only semiconductor memory, electrically erasable programmable memory, and read/write memory; wherein, said central processing unit, said read-only semiconductor memory, said electrically erasable programmable memory, and said read/write memory are connected to said central processing unit bus, and a system bus of said user terminal is able to be connected to said central processing unit bus; a data copyright management system program, a copyright management program, crypt algorithm, and user information are stored in said read-only semiconductor memory; a second private-key, a permit key, a second secret-key, and copyright information are stored in said electrically erasable programmable memory; and a first public-key, a first private-key, a second public-key, and a first crypt-key are transmitted to said read/write memory during operation.

Claim 3

Dependent Claim 20 words

The data copyright management apparatus according to Claim 1 or 2, which is configured in the form of air IC.

Claim 4

Dependent Claim 21 words

The data copyright management apparatus according to Claim 1 or 2, which is configured in the form of an IC card.

Claim 5

Dependent Claim 21 words

The data copyright management apparatus according to Claim 1 or 2, which is configured in the form of a PC card.

Claim 6

Dependent Claim 21 words

The data copyright management apparatus according to Claim 1 or 2, which is configured in the form of an insertion board.

Claim 7

Dependent Claim 83 words

A data copyright management apparatus used in a user terminal for decrypting encrypted data to display or edit said data and for re-encrypting decrypted data to store, copy, or transfer said data; wherein, a computer comprising a microprocessor, a local bus connected to said microprocessor, read-only semiconductor memory and read/write memory connected to said local bus is configured; whereby, one of the microprocessor of said user terminal and the microprocessor of said data copyright management apparatus performs decryption and the other performs re-encryption.

Claim 8

Dependent Claim 118 words

A data copyright management apparatus used in a user terminal for decrypting encrypted data to display or edit said data and for re-encrypting decrypted data to store, copy, or transfer said data; said data copyright management apparatus comprising a first microprocessor and a second microprocessor; wherein, a first computer comprising a first local bus connected to said first microprocessor, and first read-only semiconductor memory arid first read/write memory connected to said first local bus; and, a second computer comprising a second local bus connected to said second microprocessor, and second read-only semiconductor memory and second read/write memory connected said second local bus are configured; whereby, said first microprocessor decrypts encrypted data, and said second microprocessor re-encrypts decrypted data.

References Cited (Backward Citations)

JPH0646419A Cited

JPH06132916A Cited

JPH06141004A Cited

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