Cryptography – Cryptanalysis
Patent
1995-09-28
1997-06-03
Cain, David C.
Cryptography
Cryptanalysis
380 21, 380 25, H04L 900
Patent
active
056362773
ABSTRACT:
A system for licensing to use software products which are encrypted and packed in a single storage medium, whereby the encrypted software products can be sold on a piece-by-piece basis and it is possible to perform accounting operations and collection of sales records with accuracy in a stepwise manner for each shop related thereto. A plurality of software products are encrypted and stored in a product-medium and delivered to an end-user. At the same time, sales-medium creating means creates a sales-medium which contains product information and shop information and distributes it to wholesalers and then to retailers. Upon reception of an order and its payment from the end-user, key generating means extracts keys from the sales-medium and provides the end-user with the keys or complex keys derived therefrom, thereby allowing the end-user to decrypt the software products and make them executable. Accounting means updates the sales records by each sales transaction, and calculates the sales track records at every month-end based on the sales-media in the retailers and wholesalers in a stepwise manner.
REFERENCES:
patent: 5490216 (1996-02-01), Richardson
patent: 5509070 (1996-04-01), Schull
patent: 5548645 (1996-08-01), Ananda
patent: 5586186 (1996-12-01), Yuval et al.
Cain David C.
Fujitsu Limited
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