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

1994-04-25

1998-05-26

Gregory, Bernarr E.

Cryptography

Cryptanalysis

380 21, 380 23, 380 25, 380 49, H04L 900, H04L 932

Patent

active

057579075

ABSTRACT:
A method and apparatus is provided for distributing a software object from a source to a user. A software object is encrypted with an encryption operation utilizing a long-lived encryption key. It is directed from the source to the user. It is loaded onto a user-controlled data processing system having a particular configuration. A numerical machine identification is derived based at least in part upon the particular data processing system configuration of the user-controlled data processing system. A temporary key is derived which is based at least in part upon the numerical machine identification and the long-lived encryption key. The long-lived key generator is provided for receiving the temporary key and producing the long-lived encryption key. The user is allowed to utilize the temporary key for a prescribed interval to generate the long-lived encryption key to access the software object.

REFERENCES:
patent: 4888798 (1989-12-01), Earnest
patent: 5021997 (1991-06-01), Archie et al.
patent: 5109413 (1992-04-01), Comerford et al.
patent: 5155847 (1992-10-01), Kirouac et al.
patent: 5166886 (1992-11-01), Molnar et al.
patent: 5293422 (1994-03-01), Loiacono
patent: 5337357 (1994-08-01), Chou et al.
"Information Distribution via Rom Disks" (IBM Technical Disclosure Bulletin, vol. 33, No. 12, May 1991).
"Data Masking Algorithm" (IBM Technical Disclosure Bulletin, vol. 32, No. 6B, Nov. 1989).

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