초록 ▼

A system for controlling and accounting for retrieval of data from a CD-ROM memory containing encrypted data files from which retrieval must be authorized. The system includes an authorization and key distribution terminal and a plurality of customer data retrieval terminals having such memories loa

A system for controlling and accounting for retrieval of data from a CD-ROM memory containing encrypted data files from which retrieval must be authorized. The system includes an authorization and key distribution terminal and a plurality of customer data retrieval terminals having such memories loaded therein. The authorization terminal authorizes retrieval of data by authorized customer terminals by providing to the authorized customer terminals an encryption key for enabling retrieval of the data and a authenticated credit signal for use in limiting the amount of data to be retrieved from the files. The encryption key is encrypted for communication to the customer terminals in unique unit keys that are stored in the respective customer terminals. The customer terminal limits the amount of data retrieved from the files in accordance with the credit signal; records the amount of data retrieved from the files; and provides to the authorization termimal an authenticated report of the recorded amount of data retrieved from said files. The memory includes data files of different data vendors; and the customer terminal separately records the retrieval of data from the files of the different vendors.

대표청구항 ▼

A method of controlling and accounting for retrieval of data from a memory, comprising the steps of (a) providing a memory containing an encrypted data file from which retrieval must be authorized; (b) authorizing said retrieval by providing an encryption key for enabling retrieval of said data and

A method of controlling and accounting for retrieval of data from a memory, comprising the steps of (a) providing a memory containing an encrypted data file from which retrieval must be authorized; (b) authorizing said retrieval by providing an encryption key for enabling retrieval of said data and a credit signal for use in limiting the amount of data to be retrieved from said file; (c) limiting the amount of data retrieved from said file in accordance with said credit signal; (d) recording the amount of data retrieved from said file; (e) reporting the recorded amount of data retrieved from said file; and (f) authenticating said report.