Method and apparatus for controling access to storage media
First Claim
1. A method for dissuading the illicit copying of data stored on an optical disk in an optical data structure representing a series of bits, said method comprising the steps of:
- (a) reading the optical disk at a locus to obtain data true to the series of bits represented by the optical data structure at such locus;
(b) re-reading the optical disk at the locus to determine if the data obtained varies by one or more bits in the series of bits represented by the optical data structure at such locus; and
(c) dissuading copying of the optical disk if the data obtained in step (b) differs from the data in step (a).
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Accused Products
Abstract
A method and apparatus for preventing copying of data from optical disks. A locus on optical disk is initially read to produce a signal and is then re-read by a reader to produce a second signal. The signal detected upon re-reading is different from the signal that is detected upon initial sampling. A method and apparatus for controlling access to an optical disk, such as an optically readable disk. Light sensitive or other materials that are adapted to change state and affect reading of an optical disk are used to control access to data that may be stored on optical disk and/or to control use of the optical disk.
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Citations
46 Claims
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1. A method for dissuading the illicit copying of data stored on an optical disk in an optical data structure representing a series of bits, said method comprising the steps of:
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(a) reading the optical disk at a locus to obtain data true to the series of bits represented by the optical data structure at such locus;
(b) re-reading the optical disk at the locus to determine if the data obtained varies by one or more bits in the series of bits represented by the optical data structure at such locus; and
(c) dissuading copying of the optical disk if the data obtained in step (b) differs from the data in step (a). - View Dependent Claims (3)
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- 2. An article of manufacturing comprising a computer usable optical disk having computer readable program code embodied in an optical data structure, said article of manufacture including one or more sites of optical disuniformity therein that are not embodied in said optical data structure, said sites of optical disuniformity hampering the normal copying function of a computer, and wherein said computer readable program code comprises computer readable program code for causing said computer to read said optical data structure, or portion thereof, only when said sites of optical disunformity are present in said computer usable medium.
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11. An optical disk comprising:
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a substrate;
a data track disposed on the substrate, the data track including a first set of usable data; and
a light-sensitive compound disposed on at least a portion of the disk and cooperating with at least a portion of the data track, the light-sensitive compound being excitable with a suitable stimulus to produce a second set of usable data that is different from the first set of usable data regardless of the first set of usable data in the data track. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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- 34. The disk of 11 wherein activated light-sensitive compound is disposed under at least a portion of the locus.
Specification