Copy-protected compact disc and method for producing same
View Patent ↗A copy-protected compact disc and a method for producing the optical disc and preventing unauthorized copying is provided. In one embodiment, the contents of at least one of the lead-in items in the optical disc are altered so that it is no longer uniform, thereby making a copied disc effectively corrupted and unplayable.
1. An optical disc having at least one session, said at least one session comprising a lead-in having a plurality of subcoding blocks, each of said plurality of subcoding blocks comprising an item in channel Q, said item comprising at least a Point (PT), address/control (Adr/Ctrl), absolute-time minutes (Pmin), absolute-time seconds (Psec) and absolute-time frames (Pframe)
wherein the Point of the item in at least one of said plurality of subcoding blocks is identical to the Point of another item in at least one other of said plurality of subcoding blocks;
wherein a value of at least one of a group including Adr/Ctrl, Pmin, Psec and Pframe of the item in said at least one of said plurality of subcoding blocks differs from a corresponding value of at least one of the corresponding group of Adr/Ctrl, Pmin, Psec and Pframe of the other item in said at least one other of said plurality of subcoding blocks;
wherein said plurality of subcoding blocks comprise a continuous repetition of table of contents (TOCs), wherein at least one item in at least one of the group including Adr/Ctrl, Pmin, Psec and Pframe of one of said repetition of table of contents (TOCs) has a different value from the corresponding item in at least one other of said repetition of table of contents (TOCs);
wherein said one of said repetition of table of contents (TOCs) comprises a misleading or invalid triplet; and
wherein said misleading or invalid triplet comprises a misleading or invalid point.
2. An optical disc having at least one session, said at least one session comprising a lead-in having a plurality of subcoding blocks, each of said plurality of subcoding blocks comprising an item in channel Q, said item comprising at least a Point (PT), address/control (Adr/Ctrl), absolute-time minutes (Pmin), absolute-time seconds (Psec) and absolute-time frames (Pframe);
wherein the Point of at least one of said plurality of subcoding blocks is identical to the Point in at least one other of said plurality of subcoding blocks;
wherein the value of at least one of a group including Adr/Ctrl, Pmin, Psec and Pframe in said at least one of said plurality of subcoding blocks differs from the value of at least one of the corresponding group of Adr/Ctrl, Pmin, Psec and Pframe in said at least one other of said plurality of subcoding blocks;
wherein said plurality of subcoding blocks comprise a continuous repetition of table of contents (TOCs), wherein at least one item in at least one of the group including Adr/Ctrl, Pmin, Psec and Pframe of one of said repetition of table of contents (TOCs) has a different value from the corresponding item in at least one other of said repetition of table of contents (TOCs); and
wherein said one of said repetition of table of contents (TOCs) comprises an interleaved pattern of alternating valid and invalid triplets.
3. The optical disc according to claim 2 , wherein said alternating valid and invalid triplets are represented by audio and data item respectively, or vice versa.
4. The optical disc according to claim 2 , wherein said pattern is randomized.
5. The optical disc according to claim 4 , wherein each track is represented by at least one audio and one data item.
6. The optical disc according to claim 4 , wherein one of the points of said one of said repetition of table of contents (TOCs) remain uniform.
7. An optical disc having at least one session, said at least one session comprising a lead-in having a plurality of subcoding blocks, each of said plurality of subcoding blocks comprising an item in channel Q, said item comprising at least a Point (PT), address/control (Adr/Ctrl), absolute-time minutes (Pmin), absolute-time seconds (Psec) and absolute-time frames (Pframe)
wherein the Point of the item in at least one of said plurality of subcoding blocks is identical to the Point of another item in at least one other of said plurality of subcoding blocks;
wherein a value of at least one of a group including Adr/Ctrl, Pmin, Psec and Pframe of the item in said at least one of said plurality of subcoding blocks differs from a corresponding value of at least one of the corresponding group of Adr/Ctrl, Pmin, Psec and Pframe of the other item in said at least one other of said plurality of subcoding blocks; and
wherein said plurality of subcoding blocks comprise a plurality of zones, wherein an alteration algorithm is applied to each of said plurality of zones.
8. The optical disc according to claim 7 , further comprising a multi-session disc having a plurality of multi-session pointers, wherein at least one of said plurality of multi-session pointers is invalid or misleading.
9. An optical disc having at least one session, said at least one session comprising a lead-in having a plurality of subcoding blocks, each of said plurality of subcoding blocks comprising an item in channel Q, said item comprising at least a Point (PT), address/control (Adr/Ctrl), absolute-time minutes (Pmin), absolute-time seconds (Psec) and absolute-time frames (Pframe);
wherein the Point of at least one of said plurality of subcoding blocks is identical to the Point in at least one other of said plurality of subcoding blocks;
wherein the value of at least one of a group including Adr/Ctrl, Pmin, Psec and Pframe in said at least one of said plurality of subcoding blocks differs from the value of at least one of the corresponding group of Adr/Ctrl, Pmin, Psec and Pframe in said at least one other of said plurality of subcoding blocks;
wherein said plurality of subcoding blocks comprise a plurality of zones, wherein an alteration algorithm is applied to each of said plurality of zones; and
wherein said plurality of zones comprise any combination of a group including a valid table of contents (TOCs), an invalid table of contents (TOCs), an interleaved pattern of alternating valid and invalid entries and one of a group including at least one data track or at least one invalid triplet, wherein said invalid table of contents (TOCs) comprises one repetition of the table of contents (TOCs), which is different from at least one other of repetition of the table of contents (TOCs).
10. An optical disc having at least one session, said at least one session comprising a lead-in having a plurality of subcoding blocks, each of said plurality of subcoding blocks comprising an item in channel Q, said item comprising at least a Point (PT), address/control (Adr/Ctrl), absolute-time minutes (Pmin), absolute-time seconds (Psec) and absolute-time frames (Pframe)
wherein the Point of the item in at least one of said plurality of subcoding blocks is identical to the Point of another item in at least one other of said plurality of subcoding blocks;
wherein a value of at least one of a group including Adr/Ctrl, Pmin, Psec and Pframe of the item in said at least one of said plurality of subcoding blocks differs from a corresponding value of at least one of the corresponding group of Adr/Ctrl, Pmin, Psec and Pframe of the other item in said at least one other of said plurality of subcoding blocks; and
a multi-session disc having a plurality of multi-session pointers, wherein at least one of said plurality of multi-session pointers is invalid or misleading.
11. A method for generating a valid lead-in containing continuous repetition of table of contents (TOCs), said method comprising the steps of: a. reading the entire Program Area; b. reading the channel Q of a frame being analyzed; c. comparing the track number (TNO) of the analyzed frame with the track number (TNO) of the previous frame; d. if the track number (TNO) of the analyzed frame is greater than the track number (TNO) of the previous frame, creating a TOC entry with the new track number and the absolute-time (ATime) of the analyzed frame.