Method and apparatus for enabling trial period use of software p

Details Method and apparatus for enabling trial period use of software p Method and apparatus for enabling trial period use of software p

1996-08-02

1998-04-07

Gregory, Bernarr E.

Cryptography

Cryptanalysis

380 9, 380 23, 380 25, 380 49, 380 50, 395186, 395427, 395481, 395490, 395491, H04L 900

Patent

active

057374163

ABSTRACT:
A method and apparatus is provided in a data processing system for securing access to particular files which are stored in a computer-accessible memory media. A file management program is provided as an operating system component of the data processing system. At least one encrypted file and at least one unencrypted file are stored in the computer-accessible memory media. An unencrypted security stub is associated with each of the encrypted files. The security stub is at least partially composed of executable code. The file management program is utilized to monitor data processing calls for a called file stored in the computer-accessible memory media. The file management program determines what the called file has an associated unencrypted security stub. The called file is processed in a particular manner dependent upon whether or not the called file has an associated unencrypted security stub.

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patent: 5155847 (1992-10-01), Kirouac et al.
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"Data Masking Algorithm" (IBM Technical Disclosure Bulletin, vol. 32, No. 6B, Nov. 1989).
"Information Distribution via Rom Disks" (IBM Technical Disclosure Bulletin, vol. 33 No. 12, May 1991).

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