1995-12-20
1996-10-08
Cain, David C.
Cryptography
Cryptanalysis
380 25, 380 49, H04L 900
Patent
active
055639470
ABSTRACT:
Encrypted data on a CD-PROM disk is managed by selectively encoding binary digital decryption keys onto the same disk in a separate data area. A decryption key or keys may be programmed onto the disk after manufacture, such as at the point of sale, by selectively obliterating the readability of bits in addressable sectors. A binary digital key is then later recognized as the result of a string of addressable sectors, with one or the other of readable or unreadable sectors being recognized as a logical 1 and the other as a logical 0. In an embodiment, a manufacturer may place several or all versions and features of a large program on a single CD-ROM, encrypted, and later provide keys to enable only selected ones of the features and versions for retrieval.
REFERENCES:
patent: 4577289 (1986-03-01), Comerford et al.
patent: 4584641 (1986-04-01), Guglielmino
patent: 4644493 (1987-02-01), Chandra et al.
patent: 4695993 (1987-09-01), Takagi et al.
patent: 5027396 (1991-06-01), Platteter et al.
Boys Donald R.
Cain David C.
Elonex IP Holdings Ltd.
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