| 5410598 |
Database usage metering and protection system and method |
| Apr-25-1995 |
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... |
| 5394469 |
Method and apparatus for retrieving secure information from mass storage media |
| Feb-28-1995 |
A personal computer or "host computer" and a Mass storage device are arranged on an SCSI bus. A "decryption controller", in a separate enclosure outside of the host computer, is also arranged on the SCSI... |
| 5392353 |
Interactive satellite broadcast network |
| Feb-21-1995 |
Encrypted communications ensure privacy of communications point-to-point in a network of interactive video stations interconnected by a broadcast network. The encryption as a function of personal identity... |
| 5351293 |
System method and apparatus for authenticating an encrypted signal |
| Sep-27-1994 |
A cryptographic communications system includes a method and apparatus for exchanging messages between a user terminal, containing a secret key, and an operations center wherein each party authenticates... |
| 5247575 |
Information distribution system |
| Sep-21-1993 |
An information distribution system provides information to a user, when the information corresponds to criteria individually selected by the user, and then charges the user only for the selected information... |
| 5191611 |
Method and apparatus for protecting material on storage media and for transferring material on storage media to various recipients |
| Mar-2-1993 |
A method and apparatus for granting privileges for securely and selectively retrieving material such as data and databases, messages and other textual information, graphics, tables, analogs such as maps,... |
| 5103392 |
System for storing history of use of programs including user credit data and having access by the proprietor |
| Apr-7-1992 |
A system for storing data on the history of use of programs consisting of a data processing apparatus and a program storage unit, such as a magnetic tape, which stores program-specific data. The data processing... |
| 5073925 |
Method and apparatus for the protection of signal copy |
| Dec-17-1991 |
An apparatus for the protection of signal copy for preventing unauthorized copying of music software such as records, compact discs and music tape by recording is arranged such that when recording audio... |
| 5050213 |
Database usage metering and protection system and method |
| Sep-17-1991 |
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... |
| 5010571 |
Metering retrieval of encrypted data stored in customer data retrieval terminal |
| Apr-23-1991 |
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... |
| 4999806 |
Software distribution system |
| Mar-12-1991 |
A central station distributes software by telephone. The central station accepts credit card information, transmits an acceptance code to a caller and then terminates the call. After verifying the credit... |
| 4977594 |
Database usage metering and protection system and method |
| Dec-11-1990 |
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... |
| 4827508 |
Database usage metering and protection system and method |
| May-2-1989 |
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... |
| 4789863 |
Pay per view entertainment system |
| Dec-6-1988 |
In a pay per view entertainment system, prerecorded entertainment such as musical works are distributed to subscribers over a cable network. The subscribers are able to listen to edited versions or previews... |
| 4323921 |
System for transmitting information provided with means for controlling access to the information transmitted |
| Apr-6-1982 |
A system for transmitting information between an emitting center and receiving stations, comprising: a subscription administration center generating a plurality of subscriber's keys C.sub.i changing randomly... |
