05790489 is referenced by 54 patents and cites 13 patents.

A compact disk includes a processor and a transmission element under control of the processor. A laser in a compact disk read head illuminates a photosensitive array disposed on the compact disk to generate a current in a charging array. The current generated in charging array is supplied to a storage element. The storage element supplies the processor with power. The processor controls a transmission element electrically coupled to the processor and optically coupled to the compact disk reader to impart an informational signal to the compact disk reader such as a cryptographic key to control utilization of the contents of the CD. The CD can be written to by the CD controller by having the CD read circuit control the light provided to the photosensitive array to impart an information signal to the photosensitive sensitive array. A circuit is coupled to the light sensitive array to time the on and off state of the current supplied to the light sensitive array and to thereby detect the informational signal from the compact disk reader circuit.

Title
Smart compact disk including a processor and a transmission element
Application Number
8/784570
Publication Number
5790489
Application Date
January 21, 1997
Publication Date
August 4, 1998
Inventor
Clint H O Connor
Austin
TX, US
Agent
Skjerven Morrill MacPherson Franklin & Friel
Assignee
Dell USA
TX, US
IPC
G11B 7/00
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