최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0310938 (1989-02-16) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 827 인용 특허 : 52 |
A “return on investment”digital database usage metering, billing, and security system includes a hardware device which is plugged into a computer system bus (or into a serial or other functionally adequate connector) and a software program system resident in the hardware device. One or more database
A “return on investment”digital database usage metering, billing, and security system includes a hardware device which is plugged into a computer system bus (or into a serial or other functionally adequate connector) and a software program system resident in the hardware device. One or more databases are encrypted and stored on a non-volatile mass storage device (e.g., an optical disk). A tamper-proof decrypting device and associated controller decrypts selected portions of the stored database and measures the quantity of information which is decrypted. This measured quantity information is communicated to a remote centralized billing facility and used to charge the user a fee based on database usage. A system may include a “self-destruct”feature which disables system operation upon occurrence of a predetermined event unless the user implements an “antidote”-instructions for implementing the antidote being given to him by the database owner only if the user pays his bills. Absolute database security and billing based on database usage are thus provided in a system environment wherein all database access tasks are performed at the user\s site. Moreover, a free market competitive environment is supported because literary property royalties can be calculated based on actual data use.
A secure data base access system comprising: at least one storage medium storing at least one textual database in encrypted form, said at least one database including at least one collection of textual information, said at least one storage medium also storing index information, said index informati
A secure data base access system comprising: at least one storage medium storing at least one textual database in encrypted form, said at least one database including at least one collection of textual information, said at least one storage medium also storing index information, said index information correlating portions of said at least one encrypted database with search information; at least one host signal processor, operatively connected to said at least one storage medium, said at least one processor preprogrammed so as to: (a) accept search criteria in response to user input thereto, (b) search said index information, (c) identify, in accordance with said search of index information, the portions of said at least one encrypted database which satisfy said search criteria, and (d) read at least one of said identified encrypted database portions from said at least one storage medium; means for decrypting at least one read portion of said encrypted at least one database to produce corresponding decrypted information; and decoder control logic means, coupled to said host at least one processor, and said decrypting means, for measuring the percentage of at least one information collection decrypted by said decrypting means, said decoder control logic means including means for preventing decryption of more than at least one predetermined percentage of said at least one information collection.
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