Cd-prom
AssigneeElonex I.P. Holdings, Ltd.
InventorDan Kikinis
Life of this patent
Estimating the term…
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.
Claims12
A method for providing security for stored data on a compact disk read-only memory (CD-ROM), comprising steps of:
- (a) providing the stored data in an encrypted form in formatted sectors of a recording region on the CD-ROM, decrypting of the encrypted data requiring a keyword;
- and
- (b) programming the keyword into a programming region on the CD-ROM by damaging the physical structure of the recording track in selected sectors in the programming region, the selected sectors spanning a region of the CD-ROM having a digital storage capacity of up to 500 megabytes.
A method for providing access control to only selected files of multiple files stored on a compact disk read-only memory (CD-ROM), comprising steps of:
- (a) recording the files in an encrypted form in formatted sectors of a recording region on the CD-ROM;
- and
- (b) programming digital keywords for decrypting only the selected files into a programming region of the CD-ROM by damaging the physical structure of the recording track in selected sectors in the programming region, the selected sectors spanning a region of the CD-ROM having a digital storage capacity of up to 500 megabytes.
An encrypted compact disk read-only memory (CD-ROM), comprising:
- a recording region wherein information is recorded in an encrypted fashion responsive to a decryption algorithm based on a unique keyword;
- and
- a programming region having formatted sectors along a data track wherein one or more decryption keywords are programmed by damaging the data track in selected sectors;
- wherein the damaged sectors forming a keyword span a region of the CD-ROM having a digital storage capacity of up to 500 megabytes.
Dependencies are inferred from the claim text.