# US 5,703,858 A · System for encoding a glass master to enable detection of a counterfeit optical CD-ROM > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,703,858 A - Document ID: US5703858A - Status: Granted - Kind: A - Application number: 08/735,377 - Filed: 1996-10-21 - Granted: 1997-12-30 - Earliest claimed: 1995-01-23 - Assignees: Sony Corporation; Digital Audio Disc Corporation - Inventors: Michael L. Mitchell; Barry Alan Fite; Akiya Saito; Anthony C. New - Web page: https://patentgrep.com/patent/US5703858A ## CPC - G11B 20/00927: {wherein said defects or errors are generated on purpose, e.g. intended scratches} - G11B 7/0045: Recording (G11B7/006, G11B7/0065 take precedence) - G11B 7/263: {Preparing and using a stamper, e.g. pressing or injection molding substrates (production of optical record carriers, e.g. optical discs B29D17/005)} - G11B 19/04: Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions - G11B 20/00086: {Circuits for prevention of unauthorised reproduction or copying, e.g. piracy (indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00)} - G11B 20/00123: {the record carrier being identified by recognising some of its unique characteristics, e.g. a unique defect pattern serving as a physical signature of the record carrier} - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract A device for enabling detection of a counterfeit optical CD-ROM is disclosed for use in a conventional mastering system. The device includes a signal source for providing a first signal for forming a predetermined defect in a glass master. The device also includes a switch for connecting a recorder of the mastering system to the signal source. In addition, the device includes a decoder for decoding encoded data and address information provided from an input source of the mastering system. Furthermore, the device includes a central processor unit which serves to detect whether a selected address from the decoded data is present. Upon detection of the selected address, the CPU controls the switch to connect the signal source to the recorder to enable the recorder to receive the first signal and form the predetermined defect at the selected address. When a CD-ROM manufactured from the glass master is played back, a desired error signal is generated at the predetermined address indicating that the CD-ROM is not counterfeit. Further, when a counterfeit CD-ROM is played back, the desired error signal is not generated at the predetermined address, thus enabling detection of the counterfeit CD-ROM. In addition, the defect is not visible to the unaided eye when the CD-ROM is viewed. ## Claims ### Claim 1 A device for forming a glass master to inhibit manufacture of a counterfeit optical CD-ROM, wherein said device is used in conjunction with a mastering system having an input source for providing data to be recorded on said glass master and a recorder for forming said glass master in accordance with a received signal, comprising: a signal source for providing a random high frequency signal for forming a first defect in said glass master; a switch for electrically connecting said recorder to said signal source; and a central processor unit (CPU) for controlling said switch to electrically connect said signal source to said recorder to form said first defect at a selected address of said glass master wherein said first defect causes generation of a predetermined error signal in a CD-ROM manufactured from said glass master. ### Claim 2 (depends on 1) The device according to claim 1 further including terminal means for selecting said selected address. ### Claim 3 (depends on 1) The device according to claim 1 wherein said encoded data is EFM encoded data. ### Claim 4 (depends on 1) The device according to claim 1, wherein said selected address is a sector address. ### Claim 5 A device for forming a glass master to inhibit manufacture of a counterfeit optical CD-ROM, wherein said device is used in conjunction with a mastering system having an input source for providing EFM encoded data which includes sector address information and a recorder for forming said glass master in accordance with a received signal, comprising: a signal source for providing a random high frequency signal for forming a first defect in said glass master; a switch for connecting said recorder to either said input source or said signal source; a decoder for decoding said EFM encoded data and said sector address information to provide decoded data; a central processor unit (CPU) coupled to said decoder for detecting whether or not a selected address from said decoded data is present, wherein when said selected sector address is detected, said CPU controls said switch to connect said signal source to said recorder to enable said random high frequency signal to form said first defect at said selected address wherein said first defect is not visible to an unaided eye in a CD-ROM manufactured from said glass master, and when said CD-ROM is played back a predetermined error signal is generated indicating said CD-ROM is not counterfeit and when duplicating equipment is used to duplicate said CD-ROM to form a counterfeit glass master, said first defect is not accurately duplicated wherein when a counterfeit CD-ROM formed from said counterfeit glass master is played back, said predetermined error signal is not generated thus indicating a counterfeit CD-ROM; and selecting means for selecting said sector address from said encoded data. ### Claim 6 (depends on 5) The device according to claim 5 wherein said selecting means is a computer terminal. ### Claim 7 (depends on 5) The device according to claim 5 wherein said encoded data is EFM encoded data. ### Claim 8 (depends on 5) The device according to claim 5, wherein said selected address is a sector address. ### Claim 9 A mastering system for forming a glass master having a defect at a predetermined address to inhibit manufacture of a counterfeit CD-ROM, comprising: an input source for providing an input signal having encoded data which includes address information; a signal source for providing a random high frequency signal for forming a first defect; a recorder for forming said glass master in accordance with a received signal; a switch for connecting said recorder to either said input source or said signal source; a decoder for decoding said encoded data and said address information to provide decoded data; and a central processor unit (CPU) coupled to said decoder for detecting whether or not a selected address from said decoded dam is present, wherein when said selected address is not detected, said CPU controls said switch to connect said recorder to said input source to enable formation of said glass master, and wherein when said selected address is detected, said CPU controls said switch to connect said signal source to said recorder to enable said random high frequency signal to form said first defect at said selected address wherein said first defect is not visible to an unaided eye in a CD-ROM manufactured from said glass master, and when said CD-ROM is played back a predetermined error signal is generated indicating said CD-ROM is not counterfeit and when duplicating is used to duplicate said CD-ROM to form a counterfeit glass master, said first defect is not accurately duplicated wherein when a counterfeit CD-ROM formed from said counterfeit glass master is played back, said predetermined error signal is not generated thus indicating a counterfeit CD-ROM. ### Claim 10 (depends on 9) The device according to claim 9 further including terminal means for selecting said selected address. ### Claim 11 (depends on 9) The device according to claim 9 wherein said encoded data is EFM encoded data. ### Claim 12 (depends on 9) The device according to claim 9, wherein said selected address is a sector address. ### Claim 13 A method for forming a glass master having a defect, comprising the steps of: (a) providing an input signal to a recorder for forming said glass master; (b) generating a a random high frequency signal for forming a first defect; (c) selecting a predetermined address at which to form said first defect; (d) providing said signal to said recorder to form said first defect at said predetermined address wherein said first defect causes generation of a predetermined error signal in a CD-ROM manufactured from said glass master for inhibiting manufacture of counterfeit CD-ROMs. ### Claim 14 (depends on 13) The method according to claim 13, wherein said input signal includes encoded address information and further including the step of decoding said encoded address information. ### Claim 15 (depends on 13) The method according to claim 13 further including .terminal means for selecting said selected address. ### Claim 16 (depends on 13) The device according to claim 13 wherein said input signal includes EFM encoded data. ### Claim 17 A CD-ROM adapted for inhibiting unauthorized copying of said CD-ROM, comprising: a disk shaped element having a signal surface for storing digitally encoded data, said data being represented by pits and lands formed on said signal surface, wherein a portion of said signal surface is formed for providing data for producing an error signal when said CD-ROM is played back, said portion being formed by a random high frequency signal and not being visible to an unaided eye and said error signal indicating that said CD-ROM is not counterfeit, wherein if said error signal is not generated a counterfeit CD-ROM is indicated. ### Claim 18 (depends on 17) The CD-ROM according to claim 17, wherein said data includes sectors and said portion includes at least one sector. ### Claim 19 (depends on 17) The CD-ROM according to claim 17, wherein the location of said portion is predetermined.