Dynamic copy protection of optical media
View Patent ↗A method for copy protection includes receiving data in a recording module representing content to be recorded on a recording medium, the data including an indication that the content is to be protected from unauthorized copying. Responsive to the indication, the recording module signals a protection module to initiate a protection protocol in synchronization with the recording module. The protection module generates control information, so as to prevent the unauthorized copying of the content that is to be protected, and conveys the control information to the recording module, in accordance with the protocol. The recording module combines the control information with the data representing the content in the recording module, for recording on the recording medium.
1. A method for preventing copying of a compact disk (CD) by an unauthorized readout device which reads a Table of Contents (TOC) structure of the CD and performs an integrity check thereof before accessing CD content, the method comprising:
preparing a first TOC having first timing information about track numbers of an audio session to be recorded on the CD;
preparing modified and misleading second timing information about the track numbers, which
yields conflicting track information when compared with the first timing information, and
results in an error condition when the unauthorized readout device performs the integrity check, thereby preventing the CD content from being accessed;
preparing a second TOC having the modified and misleading second timing information for a data session to be recorded on the CD; and
recording the audio and the data sessions on the CD together with the first TOC and the second TOC.
2. A method according to claim 1 , wherein the first TOC indicates that one or more of the tracks are audio mode tracks, and wherein preparing the second TOC comprises indicating in the second TOC that the one or more tracks are not audio mode tracks.
3. Apparatus for preventing copying of a compact disk (CD) by an unauthorized readout device which reads a Table of Contents (TOC) structure of the CD and performs an integrity check thereof before accessing CD content, the apparatus comprising:
a protection processor, adapted to:
prepare a first TOC having first timing information about track numbers of an audio session to be recorded on the CD;
prepare modified and misleading second timing information about the track numbers, which
yields conflicting track information when compared with the first timing information, and
results in an error condition when the unauthorized readout device performs the integrity check, thereby preventing the CD content from being accessed; and
prepare a second TOC having the modified and misleading second timing information for a data session to be recorded on the CD; and
a recording device, coupled to receive the first TOC and the second TOC from the protection processor, and to record the audio and the data sessions on the CD together with the first TOC and the second TOC.
4. Apparatus according to claim 3 , wherein the first TOC indicates that the tracks are audio mode tracks, and wherein the protection processor is adapted to record an indication in the second TOC that the tracks are not audio mode tracks.
5. A computer software product for preventing copying of a compact disk (CD) by an unauthorized readout device which reads a Table of Contents (TOC) structure of the CD and performs an integrity check thereof before accessing CD content, the product comprising a computer-readable medium in which program instructions are stored, which instructions, when read by a computer, cause the computer to:
prepare a first TOC having first timing information about track numbers of an audio session to be recorded on the CD;
prepare modified and misleading second timing information about the track numbers, which
yields conflicting track information when compared with the first timing information, and
results in an error condition when the unauthorized readout device performs the integrity check, thereby preventing the CD content from being accessed;
prepare a second TOC having the modified and misleading second timing information for a data session to be recorded on the CD; and
record the audio and the data sessions on the CD together with the first TOC and the second TOC.
6. A product according to claim 5 , wherein the first TOC indicates that the tracks are audio mode tracks, and wherein the instructions cause the computer to record an indication in the second TOC that the tracks are not audio mode tracks.
7. A compact disk (CD) that is resistant to copying by an unauthorized readout device which reads a Table of Contents (TOC) structure of the CD and performs an integrity check thereof before accessing CD content, the CD comprising:
an audio session including a first TOC having first timing information about track numbers; and
a data session including a second TOC having modified and misleading second timing information about the track numbers, which
yields conflicting track information when compared with said first timing information, and
results in an error condition when the unauthorized readout device performs the integrity check, thereby preventing the CD content from being accessed.
8. A CD according to claim 7 , wherein the first TOC indicates that the track numbers refer to audio mode tracks, and wherein the second TOC indicates that the same track numbers do not refer to audio mode tracks.