Copy-protected optical media and method of manufacture thereof
First Claim
Patent Images
1. An optical medium comprising:
- a first substrate layer having a first major surface and a second major surface, said first major surface of said first substrate layer having light-changeable material thereon;
a second substrate layer having a first major surface and a second major surface, said first major surface of said second substrate layer having information pits thereon, and said second major surface being disposed along said first major surface of said first substrate layer;
a metal reflector layer, said metal reflector layer being disposed along said first major surface of said second substrate layer;
a first overcoat layer being disposed along said metal reflector layer; and
optionally a second overcoat layer being disposed along said second major surface of said first substrate layer;
wherein said light-changeable material is a material capable of existing in at least a first optical state and a second optical state, the first optical state being convertible to the second optical state upon exposure to an input signal, and the second optical state being spontaneously convertible after a period of time to the first optical state.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for fabricating read-only copy protected optical medium comprising a light-sensitive material at positions capable of altering the data read during copying of the optical medium but permitting read of the underlying data in the reading of the optical medium.
-
Citations
82 Claims
-
1. An optical medium comprising:
-
a first substrate layer having a first major surface and a second major surface, said first major surface of said first substrate layer having light-changeable material thereon;
a second substrate layer having a first major surface and a second major surface, said first major surface of said second substrate layer having information pits thereon, and said second major surface being disposed along said first major surface of said first substrate layer;
a metal reflector layer, said metal reflector layer being disposed along said first major surface of said second substrate layer;
a first overcoat layer being disposed along said metal reflector layer; and
optionally a second overcoat layer being disposed along said second major surface of said first substrate layer;
wherein said light-changeable material is a material capable of existing in at least a first optical state and a second optical state, the first optical state being convertible to the second optical state upon exposure to an input signal, and the second optical state being spontaneously convertible after a period of time to the first optical state. - View Dependent Claims (4, 5, 6, 7, 8)
-
-
2. A multi-layer optical medium comprising:
-
a substrate having a first major surface and a second major surface, said first major surface having information pits and lands thereon;
a polymeric film positioned over said first major surface, said polymeric film comprising light-changeable material positioned over one or more of said information pits and lands;
wherein said light-changeable material is a material capable of existing in at least a first optical state and a second optical state, the first optical state being convertible to the second optical state upon exposure to an input signal, and the second optical state being spontaneously convertible after a period of time to the first optical state. - View Dependent Claims (3)
-
-
9. A method for fabricating an optical medium readable by an optical reader, said method comprising the steps of:
-
obtaining a substrate so as to have a first major surface with optical data structure thereon and a second major surface that is relatively planar;
placing light-changeable material on or within said second major surface over a portion, but not all, of said optical data structure;
sealing said second major surface having said light-changeable material with a protective material;
wherein said light-changeable material is a material capable of existing in at least a first optical state and a second optical state, the first optical state being convertible to the second optical state upon exposure to an input signal, and the second optical state being spontaneously convertible after a period of time to the first optical state. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 74, 75)
metalizing said first major surface;
sealing said metalized first major surface so as to protect said metal from the ambient environment.
-
-
74. The method of claim 9 wherein said light-changeable material is positioned with respect to the optical data structure such that when the light-changeable material is in its first optical state, the bit read of said optical medium by said optical reader is true to the optical data structure, while when said light-changeable material is its second optical state, the data bit read varies by one or more bits from that true to the optical data structure.
-
75. The method of claim 9 wherein said light-changeable material of said first major surface of said first substrate layer is positioned with respect to the optical data structure of said first major surface of said second substrate layer such that when the light-changeable material is in its first optical state, the bit read of said first major surface of said second substrate layer is true to the optical data structure, while when said light-changeable material is its second optical state, the data bit read of said first major surface of said second substrate layer varies by one or more bits from that true to the optical data structure.
-
28. A method for fabricating an optical medium, said method comprising the steps of:
-
obtaining a first substrate having a first major surface and a second major surface;
placing light-changeable material on or within one or both major surfaces of said first substrate;
obtaining a second substrate having a first and a second major surface, said first major surface having information pits thereon;
affixing said first substrate having said light-changeable material to said first or second major surface of said second substrate;
wherein said light-changeable material is a material capable of existing in at least a first optical state and a second optical state, the first optical state being convertible to the second optical state upon exposure to an input signal, and the second optical state being spontaneously convertible after a period of time to the first optical state. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
-
-
44. A method for fabricating an optical medium, said method comprising:
-
obtaining a substrate having a first major surface and a second major surface, said first major surface having information pits and lands thereon;
placing a light-changeable material in or on one or more, but less than all, of said information pits or lands;
metalizing said first major surface of said substrate having information pit thereon;
disposing an overcoat layer along said metalized surface;
wherein said light-changeable material is a material capable of existing in at least a first optical state and a second optical state, the first optical state being convertible to the second optical state upon exposure to an input signal, and the second optical state being spontaneously convertible after a period of time to the first optical state. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
-
-
61. A method for fabricating an optical medium, said method comprising the steps of:
-
obtaining a first substrate having a first major surface and a second major surface, said first or second major surface, or both, having a detectable registration mark;
imprinting in select areas said first major surface of said first substrate layer with light-changeable material;
obtaining a second substrate having a first major surface and a second major surface, said first major surface of said second substrate layer having information pits thereon and either of said first or second major surface, or both, having a detectable registration mark;
affixing said second major surface of said second substrate along said first major surface of said first substrate so as said detectable registration marks overlap each other;
metalizing said first major surface of said second substrate layer having said information pits;
disposing a first overcoat layer along said metalized surface; and
optionally disposing a second overcoat layer along said second major surface of said first substrate layer;
wherein said light-changeable material is a material capable of existing in at least a first optical state and a second optical state, the first optical state being convertible to the second optical state upon exposure to an input signal, and the second optical state being spontaneously convertible after a period of time to the first optical state. - View Dependent Claims (62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73)
-
-
76. A method for authenticating an optical storage medium having a light-changeable material comprising a material capable of existing in at least a first optical state and a second optical state, the first optical state being convertible to the second optical state upon exposure to an input signal, and the second optical state being spontaneously convertible after a period of time to the first optical state, said optical storage medium having an optical data structure representative of a series of bits, the method comprising:
-
(a) reading the optical storage medium at a locus to obtain data true to the series of bits represented by the optical data structure at such locus, said optical data structure at said locus conforming to applicable specifications for the optical storage medium;
(b) re-reading the optical storage medium 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) authenticating the optical storage medium if the data obtained in step (b) differs from the data obtained in step (a).
-
-
77. A method for authenticating an optical storage medium having a light-changeable material comprising a material capable of existing in at least a first optical state and a second optical state, the first optical state being convertible to the second optical state upon exposure to an input signal, and the second optical state being spontaneously convertible after a period of time to the first optical state, said optical storage medium having an optical data structure representative of a series of bits, the method comprising:
-
(a) reading the optical storage medium at a locus to obtain unambiguous data true to the series of bits represented by the optical data structure at such locus;
(b) re-reading the optical storage medium 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) authenticating the optical storage medium if the data obtained in step (b) differs from the data obtained in step (a).
-
-
78. A method for dissuading the illicit copying of data stored on an optical data storage medium in an optical data structure, said method comprising the steps of:
-
introducing into or on said optical data storage medium a material capable of altering the data read of said optical data structure between a first data state represented by said optical data structure and a second data state not true to said optical data structure;
incorporating into the data stored on said optical data storage medium a program instruction set for detecting said first data state and said second data state and for effectuating read of said data stored on said optical data storage medium when said optical data storage medium displays said first data state and said second data state upon data read of said optical data storage medium. - View Dependent Claims (79)
-
-
80. A method for dissuading the illicit copying of data stored on an optical data storage medium comprising a series of optical deformations representative of data, said method comprising the steps of:
-
introducing one or more physical changes into or on said optical data storage medium at selected positions on or within said optical data storage medium, wherein selected positions are mapped with respect to said optical deformations, and wherein said physical changes do not alter the physical structure of said optical deformations;
incorporating into the data stored on said optical data storage medium a program instruction set for detecting said physical changes in said optical data storage medium at said mapped positions and for effectuating read of said data stored on said optical data storage medium when said physical changes are determined to be present at said select positions on or within said optical data storage medium.
-
-
81. The method of clainm 80 wherein said physical change comprises a light-sensitive compound placed on or in said optical data storage medium.
-
82. A data storage medium readable with a reader, the data storage medium comprising:
-
a substrate;
optical data structure on the substrate, the optical data structure representative of a plurality of data bits; and
a material capable of existing in at least a first optical state and a second optical state, the first optical state being convertible to the second optical state upon exposure to an input signal, and the second optical state being spontaneously convertible after a period of time to the first optical state;
wherein the material is positioned at one or more discrete loci along the data storage medium in respect of the optical structure, such that when the data storage medium is first read at a locus, and the material is in its first optical state, the bit data read is true to the optical data structure at such locus, while when the data storage medium is re-read at the locus, and the material is in its second optical state, the data bit read varies by one or more bits from that true to the optical data structure at the locus.
-
Specification