Source: http://www.google.com/patents/US5867579?dq=6,272,646
Timestamp: 2016-10-01 18:04:19
Document Index: 238042251

Matched Legal Cases: ['Application No. 64889', 'Application No. 237673', 'Application No. 237673', 'Application No. 237673', 'Application No. 237673', 'Application No. 237673', 'Application No. 237673', 'Application No. 237673', 'Application No. 237673', 'Application No. 237673', 'Application No. 237673', 'Application No. 64889', 'Application No. 237673', 'Application No. 237673', 'Application No. 237673', 'Application No. 237673']

Patent US5867579 - Apparatus for data copyright management system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA data copyright management apparatus for handling data copyrights, and data of digital cash and video conference system is provided. The data copyright management apparatus comprises a CPU, ROM, EEPROM, and RAM. The ROM, EEPROM, and RAM are connected to the CPU bus, and a system bus of a device which...http://www.google.com/patents/US5867579?utm_source=gb-gplus-sharePatent US5867579 - Apparatus for data copyright management systemAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS5867579 APublication typeGrantApplication numberUS 08/779,751Publication dateFeb 2, 1999Filing dateJan 10, 1997Priority dateOct 27, 1994Fee statusPaidAlso published asDE69532434D1, DE69532434T2, EP0715241A2, EP0715241A3, EP0715241B1, US6128605, US6408390, US6438694, US7986785, US8407782, US9245260, US20010013021, US20020112173, US20070079145, US20070088960, US20130061062Publication number08779751, 779751, US 5867579 A, US 5867579A, US-A-5867579, US5867579 A, US5867579AInventorsMakoto SaitoOriginal AssigneeMitsubishi CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (7), Referenced by (168), Classifications (89), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetApparatus for data copyright management system
US 5867579 AAbstract
A data copyright management apparatus for handling data copyrights, and data of digital cash and video conference system is provided. The data copyright management apparatus comprises a CPU, ROM, EEPROM, and RAM. The ROM, EEPROM, 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 first public-key, a first private-key, a second public-key, a second private-key, a first secret-key, a second secret-key, and copyright information are stored in the EEPROM. The data copyright management apparatus may be configured in the form of a monolithic or hybrid IC, a thin IC card, PC card, insertion board, and further, may be 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.
1. 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 read-only memory, and read/write memory; wherein: said central processing unit, said read-only semiconductor memory, said electrically erasable programmable read-only 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, a cryptography program based on a crypt algorithm, and user information are stored in said read-only semiconductor memory; and a first public-key, a first private-key, a second public-key a second private-key,, a first secret-key, a second secret-key, and copyright information are stored in said electrically erasable programmable read-only memory. 2. The data copyright management apparatus according to claim 1, which is configured in the form of an IC.
This is a divisional of application Ser. No. 08/549,270, filed Oct. 27, 1995, now abandoned.
By digitizing the picture signal, it is possible to handle a picture signal, e.g., a television signal, by a computer. The technology of a "multimedia system" is an emerging technology of the future capable of simultaneously handling the data handled by computers and digitized picture data.
Although data from "software with advertisement" or "free software" is generally available free of charge, it is copyrighted and its use may be restricted by the copyright depending on the way it is used.
The inventors of the present invention proposed a system for copyright management, wherein a permit key is obtained from a key control center via a public telephone line in Japanese Patent Laid-Open No. 46419/1994 and Japanese Patent Laid-Open No. 141004/1994. Japanese Patent Laid-Open No. 132916/1994 by the same inventors also discusses an apparatus for copyright management. Furthermore, the same inventors proposed a system for managing a copyright of digital data in Japanese Patent Application No. 64889/1994 (U.S. patent application Ser. No. 08/416,037) and Japanese Patent Application No. 237673/1994 (U.S. patent application Ser. No. 08/536,747).
In these systems and apparatus, one who wants to view and listen to encrypted programs requests viewing from a control center via a communications line by using a communication device. The control center sends a permit key to the requester, performs charging and collects a fee.
FIG. 1 shows a structure of the data copyright management system disclosed in the Japanese Patent Application No. 237673/1994, (U.S. patent application Ser. No. 08/536,747) in which the apparatus for data copyright management system of the present invention can be used.
In FIG. 1, a path shown by a broken line represents a path for encrypted data. A path shown by a solid line represents a path of requests from each user terminal. A path shown by a one-dot chain line represents a path through which a crypt key and authorization information corresponding to a utilization request for data are transferred. A path shown by a two-dot chain line represents a path through which copyright information is transferred from the database or from one data element to a next-order data element within the copyright management center.
Each user who uses this system has previously been entered in the database system and has been provided with database utilization software. The database utilization software includes a program for decrypting an encrypted copyright management program in addition to normal communication software such as data communications protocols.
The primary user receiving the encrypted original data Cm0ks1, two encrypted secret-keys Cks1kb1 and Cks2kb2, and encrypted copyright management program Cpks2 from the database 1 decrypts the encrypted first secret-key Cks1kb1 with the database utilization software using the first private-key Kv1 corresponding to the first public-key Kb1:
M =D(Ks2, Cmks2).
The secondary user, receiving two encrypted secret-keys, Cks2kb3 and Cks3kb4, and the encrypted copyright management program Cpks3 from the secondary copyright data 8, and using the database utilization software decrypts the encrypted second secret-key Cks2kb3 by the third private-key Kv3, and decrypts the encrypted third secret-key Cks3kb4 by the fourth private-key Kv4 corresponding to the fourth public-key Kb4:
Then, the encrypted data Cmks2 is decrypted for use by the decrypted second secret-key Ks2 using decrypted c opyright management program P:
Each user who uses the above-mentioned system must have previously been entered in the database system, and when entered in the system is provided with database software.
Because the software includes not only normal communication software, such as a data communication protocols but also a program for decrypting a copyright management program by a first crypt-key, protection is necessary.
A hard disk drive is also subject to loss or alteration of data, though it is more stable than the flexible disk.
The data copyright management apparatus proposed by the present inventors in the Japanese Patent Application No. 237673/1994 (U.S. patent application Ser. No. 08/536,747) is described in FIG. 2.
In the present application, apparatus for a data copyright management system, resulting from the further implementation of the apparatus used with the user terminal proposed in the Japanese Patent Application No. 237673/1994, (U.S. patent application Ser. No. 08/536,747) is proposed.
The central processing unit, read only semiconductor memory, electrically erasable programmable read-only memory, and read/write memory are connected to the central processing unit bus. Also, the system bus of a unit which utilizes the data can be connected to it. A data copyright management system program, a crypt algorithm, and user information are stored in the read only semiconductor memory. A second private-key, permit key, second secret-key, and copyright information are stored in the electrically erasable programmable read-only memory. The first public-key, first private-key, second public-key, and first secret-key are transferred to the read/write memory during operation of the unit. If the copyright management program is provided from the outside, it is stored in the EEPROM. Otherwise, it is stored in ROM.
In the data copyright management system described above as a Japanese Patent Application, while the obtained encrypted data is decrypted for displaying/editing, the obtained or edited data is re-encrypted to store/copy/transfer, so that no unauthorized use of the data is allowed.
Accordingly, in the apparatus used in the data copyright management system of the present invention, re-encryption of data, as well as decryption of data should be performed concurrently. However, the data copyright management apparatus described in the Japanese Patent Application can perform only one process of either data decryption or data re-encryption at the same time.
For this purpose, data which was encrypted and provided is decrypted and re-encrypted by adding at least one microprocessor, and preferably two microprocessors which are a microprocessor of the user terminal and added one, in addition to the microprocessor that controls the entire user terminal therein. When one microprocessor is added, one of the two microprocessors which include the microprocessor of the user and the added one, will decrypt data and the other will re-encrypt data.
FIG. 1 is a block diagram of the data copyright management system of Japanese Patent Application No. 237673/1994 (U.S. patent application Ser. No. 08/536,747).
FIG. 2 is a block diagram of the data copyright management apparatus of Japanese Patent Application No. 237673/1994 (U.S. patent application Ser. No. 08/536,747).
FIG. 6 is a block diagram of the data copyright management system of Japanese Patent Application No. 237673/1994 (U.S. patent application Ser. No. 08/536,747).
The data copyright management unit 30 includes electrically erasable programmable read-only memory (EEPROM) 31 in addition to the components of the data copyright management unit 15 described in Japanese Patent Application No. 237673/1994 (U.S. patent application Ser. No. 08/536,747).
The data copyright management unit 30 is a computer system having CPU 16 and local bus 17 of CPU 16, as well as ROM 18, RAM 19, and EEPROM 31 which are connected to local bus 17, wherein local bus 17 is connected to the system bus 22 of the microprocessor 21 in the user terminal 20.
Besides, either one of the first crypt-key or the second crypt-key supplied from the key control center or the copyright management center, and the data copyright management system program are stored in RAM of the user terminal unit 20.
The process of decryption and re-encryption are shared by MPU 46 of the main body of the user terminal 20 and CPU 16 of the data copyright management unit 30; one re-encrypts data and the other decrypts data, and only the processed results of the data copyright management unit 30 are transferred to the user terminal.
FIG. 6 shows an example of the data copyright management system disclosed in the Japanese Patent Application No. 237673/1994 (U.S. patent application Ser. No. 08/536,747). This system uses the secret-key system as a cryptosystem.
Reference numerals 5, 6, and 7 represent a secondary user terminal, a tertiary user terminal, and n-order user terminal respectively. Reference numerals 11, 12, and 13 represent a secondary disk, tertiary disk, and n-order disk serving as a recording medium such as a flexible disk or CD-ROM respectively. The symbol "n" represents an optional integer. When "n" is larger than four, a corresponding user terminal and a corresponding disk are arranged between the tertiary user terminal 6 and the n-order user terminal 7 and between the tertiary disk 12 and the n-order disk 13 respectively.
Original data MO of text data, binary data as a computer graphic display or computer program, digital audio data, or digital picture data stored in the database 1 or data recording medium 15 is supplied via one-way communication to the primary user terminal 4 via the communication network 2, satellite 14 or recording medium 15. In this case, the data is encrypted with a first secret-key Ks1:
This system disclosed in Japanese Patent Application No. 237673/1994 (U.S. patent application Ser. No. 08/536,747) uses the method described in the Japanese Patent Application No. 64889/1994 (U.S. patent application Ser. No. 08/416,037).
In this system, the key control center 16 processes primary utilization requests, and the copyright management center 17 processes secondary utilization requests. While the data M supplied to a primary user is encrypted by the first secret-key Ks1, the data M supplied to a secondary user is encrypted by the second secret-key Ks2. Moreover, the first secret-key Ks1 and the second secret-key Ks2 are transferred to the primary user as crypt keys from the key control center 16.
Therefore, if the tertiary user, instead of the primary user, falsely issues a request for primary utilization from the key control center 16, the first secret-key Ks1 for decryption and the second secret-key Ks2 for encryption/decryption are transferred to the tertiary user. However, it is impossible to decrypt the encrypted data Cmks3 by the first secret-key Ks1 transferred as a decryption key. Moreover, if the tertiary user, instead of the secondary user, falsely issues a request for secondary utilization to the copyright management center 17, the second secret-key Ks2 and the third secret-key Ks3 are transferred to the tertiary user as a decryption key and an encryption/decryption key respectively. However, it is impossible to decrypt the encrypted data CmKs3 by the second secret-key Ks2 transferred as a decryption key.
In the edit flow shown in 7(a), signals supplied as digital signals 61 are converted to analog signals (62). The analog signals are then edited (63) while being displayed (64), and the edited analog signals are re-digitized (65) to be stored, copied, and transferred (66).
M0=D (Ks1, Cm0ks1),
M0=D (Ks1, Cm0ks1)
In the data copyright management system which utilizes the data copyright management apparatus of the present invention, when data is decrypted for use when the obtained encrypted data are displayed/edited, data copyright is managed by encrypting data when obtained or edited data is stored/copied /transferred.
However, the data copyright management unit 15 of the Japanese Patent Application No. 237673/1994 (U.S. patent application Ser. No. 08/536,747) shown in FIG. 2 and the data copyright management unit 30 of the present invention described in FIG. 3 can perform only one process of decryption of encrypted data or encryption of decrypted data. When decrypted or edited data is stored/copied/transferred, therefore, it is necessary to store data in the user terminal or RAM of the data copyright management apparatus to re-encrypt the stored data afterwards. Thus, there is a possibility that decrypted or edited data might be lost due to accident or misoperation. This also limits the volume of data that can be processed.
Taking advantage of this function of the SCSI, yet another embodiment connects a data copyright management apparatus 85 to the system bus 22 of a user terminal 20 via SCSI 86 (hereinafter called the "SCSI bus," for clear understanding) instead of the PCI bus 81 in the embodiment shown in FIG. 9.
Data to be managed by the data copyright management apparatus of the present invention includes, in addition to text data, graphic data, computer programs, digital audio data, JPEG-based still picture data, and MPEG-based moving picture data.
The above-mentioned multiprocessor configuration of the data copyright management apparatus 80 of the embodiment shown in FIG. 9 and the data copyright management apparatus 85 of the embodiment shown in FIG. 10 is implemented by connecting the apparatus to the system bus 22 of the microprocessor 21 in the user terminal 20 via a PCI bus or a SCSI bus. In such a multiprocessor configuration, the MPU 21 of the user terminal 20 must also control the overall system. For relatively slow-speed and small data such as text data and graphic data, data copyright management with encryption and re-encryption can be performed by the multiprocessor configuration using the MPU 21 and CPU 16. For JPEG-still-picture-based moving picture data and MPEG1 or MPEG2-based moving picture data, however, data copyright management by such configuration is considerably difficult to perform because a large amount of data must be processed quickly.
Fixed information, such as software for utilizing databases and user data Iu, are stored in the ROM 18 of the first data copyright management apparatus 80 decrypting encrypted data. A first crypt-key Ks1 for decryption and data copyright management system program Ps supplied by a key control center or copyright management center are stored in the EEPROM 31.
In the Japanese Patent Application No. 237673/1994 (U.S. patent application Ser. No. 08/536,747) shown in FIG. 2 and in the embodiment of the present invention described with reference to FIG. 3, the communications device (COMM) 23, to which encrypted data is supplied, and the CD-ROM drive (CDRD) 24 are connected to the system bus of the user terminal 20. To decrypt encrypted data, therefore, the encrypted data must be transmitted by way of the system bus of the user terminal 20 and the local bus of the data copyright management apparatus, and consequently, the processing speed can be slowed. This is true for a configuration in which those attached devices are connected to a PCI bus or SCSI bus.
Copyright information Ic is stored in the EEPROM 31. If the copyright management program and cryptography program are supplied externally, such as from databases, those programs are stored in the EEPROM 31, rather than in the ROM 18.
A crypt-key Ks1 for decryption and a data copyright management system program Ps supplied from a key control center or copyright management center are store d in the EEPROM 31.
In the Japanese Patent Application No. 237673/1994 (U.S. patent application Ser. No. 08/536,747) shown in FIG. 2 and the embodiment described with reference to FIG. 3, the storage medium, such as HDD 26, for storing re-encrypted data, are connected to the system bus 22 of the user terminal 20. To store re-encrypted data, therefore, the encrypted data must be transmitted by way of the system bus 22 of the user terminal 20 and the local bus 17 of the data copyright management unit 15 or data copyright management unit 30, and consequently, processing speed can be slowed. This is true for a configuration in which those attached devices are connected to a PCI bus or SCSI bus.
The data copyright management apparatus shown in FIG. 2 which is configured as an expansion board, IC card, or PC card and described in the Japanese Patent Application No. 237673/1994 (U.S. patent application Ser. No. 08/536,747) or the data copyright management apparatus shown in FIG. 3 may be used by attaching it to a user terminal which is a computer, receiver, set-top box, digital recording medium, or PDA. However, it is desirable that a data copyright management apparatus is factory-installed in the user terminal to eliminate labor and possible failure arising from the attachment of the apparatus.
Trades in which such terminals are used as an electronic cash-box for a digital cash can be actualized by replacing, in the configuration of the data copyright management system, the database with a customer's bank, a first user terminal with a customer, the secondary user terminal with a retailer, the copyright control center with a retailer's bank, and a tertiary user terminal with a wholesaler or a maker.
Further, while the customer's bank 112, the retail shop's bank 114, and the maker's bank 116 are explained as separate entities, these can be considered as a financial system as a whole.
The customer's bank 112 which receives the customer's request for drawing out from the account selects or generates the first secret-key Ks1 so that the digital cash data MO of the amount is encrypted by the first secret-key Ks1:
and then payment is made by transmitting the encrypted digital cash data Cm1ks2 to the user terminal as a cash-box of retail shop 113 via communication network 2. At this time, the customer information Ic is also transmitted to the user terminal of retail shop 113.
In this digital cash system, the digital cash is handled through banks. As information such as the processed amount of the digital cash, date, and the secret-key demanding party information with respect to the handling of the digital cash is stored in the customer's bank, the residual amount of digital cash and usage history, can be grasped.
and supplies the generated second secret-key Ks2 to the non-participant of the video conference 123.
Cmks3=E(Ks3 , M).
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H04N21/835, H04N21/4627, H04N21/254, G07F7/08, G07F7/10, G06F1/00, G07F17/16, G06T1/00, H04L29/06Cooperative ClassificationH04N21/835, H04N21/4627, H04N21/4623, H04N21/4408, H04N21/4405, H04N21/426, H04N21/4181, H04N21/2541, H04N21/2347, H04N7/1675, H04L63/126, H04L63/062, H04L63/0464, H04L63/0442, G07F7/1016, G07F7/0866, G06T1/0021, G06Q20/3829, G06Q20/3823, G06Q20/363, G06Q20/1235, G06Q20/06, G06Q20/02, G06Q20/00, G06F2221/2107, G06F2221/0797, G06F2211/008, G06F2211/007, G06F21/10, H04N21/4334European ClassificationH04N21/4627, H04N21/2347, H04N21/433R, H04N21/4405, H04N21/4623, H04N21/835, H04N21/254R, G06Q20/02, G06F21/10, G06Q20/1235, G06T1/00W, H04L63/04B2, G06Q20/3829, H04N21/418C, G06Q20/06, H04L63/06B, H04N21/4408, H04L63/12B, H04N21/426, G06Q20/3823, H04L63/04B8, G06Q20/363, G06Q20/00, H04N7/167D, G07F7/10E, G07F7/08CLegal EventsDateCodeEventDescriptionJul 11, 2002FPAYFee paymentYear of fee payment: 4Jun 22, 2006FPAYFee paymentYear of fee payment: 8Aug 21, 2006ASAssignmentOwner name: MITSUBISHI CORPORATION, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SAITO, MAKOTO;REEL/FRAME:018148/0086Effective date: 19950929Owner name: INTARSIA SOFTWARE LLC, NEVADAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MITSUBISHI CORPORATION;REEL/FRAME:018148/0063Effective date: 20050208Jul 2, 2010FPAYFee paymentYear of fee payment: 12Oct 2, 2015ASAssignmentOwner name: XYLON LLC, NEVADAFree format text: MERGER;ASSIGNOR:INTARSIA SOFTWARE LLC;REEL/FRAME:036743/0455Effective date: 20150813RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services