1
Akhileshwari N Chandra, Liam D Comerford, Steve R White: Implementing a shared higher level of privilege on personal computers for copy protection of software. International Business Machines Corporation, Jack M Arnold, February 17, 1987: US04644493 (188 worldwide citation)

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 of a program stored in a tamper proof co-processor which forms a part of the computing machine. Th ...


2
Akhileshwari N Chandra, Liam D Comerford, Steve R White: Remote access terminal security. International Business Machines, Pollock Vande Sande & Priddy, April 10, 1990: US04916738 (146 worldwide citation)

The invention provides a method of securing remote terminal access to a central computer. The method uses the services of a physically secure coprocessor which is, or will be, coupled to the remote terminal for the purposes of effecting remote access to the central computer. The method comprises tra ...


3
Akhileshwari N Chandra, Liam D Comerford, Steve R White: Implementing a shared higher level of privilege on personal computers for copy protection of software. International Business Machines Corporation, Jack M Arnold, February 20, 1990: US04903296 (103 worldwide citation)

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 of a program stored in a tamper proof co-processor which forms a part of the computing machine. Th ...