Data processing system and method to produce softcopy book reade

Details Data processing system and method to produce softcopy book reade Data processing system and method to produce softcopy book reade

1992-02-04

1993-05-25

Barron, Jr., Gilberto

Cryptography

Cryptanalysis

380 3, 380 23, 380 28, 364419, H04L 928, G06F 1538

Patent

active

052146960

ABSTRACT:
A data processing system method and program are disclosed for limiting a book reading program for softcopy books, to be capable of reading only softcopy books published by a selected publisher. The method includes the step of generating with a data processor, a customized polynomial expression to be associated with a selected softcopy book publisher. The method continues by merging with a data processor, the customized polynomial expression with a first shell program, forming a stamping tool program for stamping a key value onto a softcopy book published by the selected publisher. The key value results from the polynomial, using the product of an integer times a hash value of the publisher's identity, as the value of the independent variable. Then the method continues by generating with a data processor, a customized inverse polynomial expression to the customized polynomial expression, to be associated with the selected softcopy book publisher. Finally, the method merges with a data processor, the customized inverse polynomial expression with a second shell program, forming a book validation program for validating the key value on the softcopy book published by the selected publisher and enabling a softcopy book reading program to read the softcopy book.

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