| 5065429 |
Method and apparatus for protecting material on storage media |
| Nov-12-1991 |
A method and apparatus for granting selected access to material such as data and databases, messages and other textual information, graphs, tables, maps, facsimiles (FAX) of all manner of transmitted materials,... |
| 5033084 |
Method and apparatus for protection of software in an electronic system |
| Jul-16-1991 |
A method and apparatus for protecting software used in an electronic system. An electronic key is associated with the software, which is at least partially unreadable unless modified. The electronic system... |
| 5014234 |
System with software usage timer and counter for allowing limited use but preventing continued unauthorized use of protected software |
| May-7-1991 |
A method is provided to prevent continued unauthorized use of protected software and to maintain control of sites where software is installed. The method allows unauthorized copies of the protected software... |
| 4903296 |
Implementing a shared higher level of privilege on personal computers for copy protection of software |
| Feb-20-1990 |
Method and apparatus which restricts software, distributed on magnetic media, to use on a single computing machine. The original medium is functionally uncopyable, until it is modified by the execution... |
| 4888798 |
Modular software security |
| Dec-19-1989 |
Disclosed is a computer method and apparatus that permits identical copies of encrypted computer software (including a number of software elements) to be distributed to many users while retaining central... |
| 4866769 |
Hardware assist for protecting PC software |
| Sep-12-1989 |
The copy protection of personal computer (PC) software distributed on diskettes is assisted by providing a unique identification (ID) stored in read only memory (ROM) of a personal computer in which software... |
| 4835682 |
Computer system for preventing copying of program from a storage medium by modifying the program using a unique key |
| May-30-1989 |
A computer system for preventing copying or duplication of a program which has a CPU, a ROM, a RAM, an FDD unit, a loader program executed by the CPU for loading the program from the FDD unit to the memory,... |
| 4796220 |
Method of controlling the copying of software |
| Jan-3-1989 |
An authorized user of the program is allowed to make any number of backup copies of a computer program and to execute each such backup copy on the same authorized machine, but is inhibited from executing... |
| 4757534 |
Code protection using cryptography |
| Jul-12-1988 |
A cryptographic method for discouraging the copying and sharing of purchased software programs allows an encrypted program to be run on only a designated computer or, alternatively, to be run on any computer... |
| 4685055 |
Method and system for controlling use of protected software |
| Aug-4-1987 |
A protection subroutine with a unique reference code is emplaced in a protected software package. The package also contains a validation program. The protection subroutine and validation program connect... |
| 4683968 |
System for preventing software piracy employing multi-encrypted keys and single decryption circuit modules |
| Aug-4-1987 |
A system which enables a protected program to run only a selected plurality of computers includes a respective unique key Ki for each computer of the plurality, the key being triple encrypted in the form... |
| 4658093 |
Software distribution system |
| Apr-14-1987 |
Software (programs, videogames, music, movies, etc.) can be authorized for use a given number of times by a base unit after which the base unit (computer, videogame base unit, record player, videorecorder... |
| 4652990 |
Protected software access control apparatus and method |
| Mar-24-1987 |
A software access control system is disclosed for controlling access to a protected application program. The software access control system comprises first and second processors, each having a terminal... |
| 4644493 |
Implementing a shared higher level of privilege on personal computers for copy protection of software |
| Feb-17-1987 |
Method and apparatus which restricts software, distributed on magnetic media, to use on a single computing machine. The original medium is functionally uncopyable, until it is modified by the execution... |
| 4486828 |
Data processing system providing data security through coded identification of accessing terminals |
| Dec-4-1984 |
A data processing system includes a host unit and terminal equipment connected thereto. Different terminal equipment is identified on the basis of a program provided on the side of the host unit and on... |
