Method and apparatus for preventing illegal copy or illegal installation of information of optical recording medium

• US 5,881,038 A
• Filed: 04/18/1995
• Issued: 03/09/1999
• Est. Priority Date: 04/18/1994
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Oshima, Mitsuaki, Gotoh, Yoshiho
• Primary Examiner(s): Edun, Muhammad N.
• Application Number:
  US08/423,668
• Time in Patent Office: 1,421 Days
• Field of Search: 369/84, 369/83, 369/85, 369/97, 369/58, 369/47, 369/48, 369/49, 369/50, 369/54, 369/59, 369/32, 369/60, 369/124, 360/48, 360/53, 360/39
• US Class Current: 369/47.12
• CPC Class Codes: G06F 2003/0697 device management, e.g. handlers, drivers, I/O schedulers
• CPC Class Codes: G06F 21/80 in storage media based on magnetic or optical technology, e.g. disks with sectors preventing unauthorised reproduction or copying of disc-type recordable media G11B20/00
• CPC Class Codes: G06F 3/0601 Interfaces specially adapted for storage systems
• CPC Class Codes: G06F 3/0623 in relation to content
• CPC Class Codes: G06F 3/0653 Monitoring storage devices or systems
• CPC Class Codes: G06F 3/0677 Optical disk device, e.g. CD-ROM, DVD
• CPC Class Codes: G11B 11/10556 with provision for moving or switching or masking the transducers in or out of their operative position
• CPC Class Codes: G11B 11/10595 Control of operating function
• CPC Class Codes: G11B 13/04 magnetically or by magnetisation and optically or by radiation, for changing or sensing optical properties
• CPC Class Codes: G11B 13/045 combined recording by magnetic and optic means
• CPC Class Codes: G11B 19/02 Control of operating function, e.g. switching from recording to reproducing
• CPC Class Codes: G11B 19/04 Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
• CPC Class Codes: G11B 19/12 by sensing distinguishing features of or on records, e.g. diameter end mark
• CPC Class Codes: G11B 19/122 involving the detection of an identification or authentication mark record carriers indicating unauthorised or prior use G11B23/28
• CPC Class Codes: 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
• CPC Class Codes: G11B 20/00094 involving measures which result in a restriction to authorised record carriers
• CPC Class Codes: 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
• CPC Class Codes: G11B 20/00166 involving measures which result in a restriction to authorised contents recorded on or reproduced from a record carrier, e.g. music or software
• CPC Class Codes: G11B 20/00188 involving measures which result in a restriction to authorised devices recording or reproducing contents to/from a record carrier
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00224 : wherein the key is obtained from a remote server
• CPC Class Codes: G11B 20/00253 : wherein the key is stored on the record carrier
• CPC Class Codes: G11B 20/00318 : the key being stored in the TOC
• CPC Class Codes: G11B 20/00557 : wherein further management data is encrypted, e.g. sector headers, TOC or the lead-in or lead-out areas
• CPC Class Codes: G11B 20/00586 : said format change concerning the physical format of the recording medium
• CPC Class Codes: G11B 20/00594 : wherein the shape of recording marks is altered, e.g. the depth, width, or length of pits
• CPC Class Codes: G11B 20/00601 : wherein properties of tracks are altered, e.g., by changing the wobble pattern or the track pitch, or by adding interruptions or eccentricity
• CPC Class Codes: G11B 20/0071 : involving a purchase action
• CPC Class Codes: G11B 20/00876 : wherein physical copy protection means are attached to the medium, e.g. holograms, sensors, or additional semiconductor circuitry
• CPC Class Codes: G11B 20/1217 : on discs
• CPC Class Codes: G11B 20/1252 : for discontinuous data, e.g. digital information signals, computer programme data
• CPC Class Codes: G11B 2007/0013 : for carriers having multiple discrete layers
• CPC Class Codes: G11B 2020/1259 : with ROM/RAM areas
• CPC Class Codes: G11B 2220/20 : Disc-shaped record carriers
• CPC Class Codes: G11B 2220/211 : Discs having both read-only and rewritable or recordable areas containing application data; Partial ROM media
• CPC Class Codes: G11B 2220/213 : Read-only discs
• CPC Class Codes: G11B 2220/237 : having exactly two recording layers
• CPC Class Codes: G11B 2220/2525 : Magneto-optical [MO] discs
• CPC Class Codes: G11B 2220/2529 : Mini-discs
• CPC Class Codes: G11B 2220/2545 : CDs
• CPC Class Codes: G11B 2220/2587 : Laser Discs; Optical disc using analog recording
• CPC Class Codes: G11B 2220/65 : wherein solid state memory is used for storing indexing information or metadata
• CPC Class Codes: G11B 2220/655 : Memory in cassette [MIC]
• CPC Class Codes: G11B 2220/90 : Tape-like record carriers
• CPC Class Codes: G11B 23/281 : by changing the physical properties of the record carrier
• CPC Class Codes: G11B 23/282 : Limited play
• CPC Class Codes: G11B 23/284 : on the record carrier
• CPC Class Codes: G11B 23/40 : Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph
• CPC Class Codes: G11B 27/034 : on discs G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 27/105 : of operating discs
• CPC Class Codes: G11B 27/107 : of operating tapes
• CPC Class Codes: G11B 27/11 : by using information not detectable on the record carrier
• CPC Class Codes: G11B 27/24 : by sensing features on the record carrier other than the transducing track ; sensing signals or marks recorded by another method than the main recording
• CPC Class Codes: G11B 27/3027 : used signal is digitally coded
• CPC Class Codes: G11B 27/3063 : Subcodes
• CPC Class Codes: G11B 27/329 : on a disc [VTOC]
• CPC Class Codes: G11B 27/34 : Indicating arrangements indicating means incorporated in magazine or cassette G11B23/046 and G11B23/0875; indicating measured values in general G01D
• CPC Class Codes: G11B 27/36 : Monitoring, i.e. supervising the progress of recording or reproducing for digital recording G11B20/00 and s.gr.; for monitoring, testing or measuring of TV recorders of the type covered by H04N5/76 and subgroups, see H04N17/06
• CPC Class Codes: G11B 5/012 : Recording on, or reproducing or erasing from, magnetic disks G11B17/00, G11B19/00 take precedence
• CPC Class Codes: G11B 5/1278 : specially adapted for magnetisations perpendicular to the surface of the record carrier
• CPC Class Codes: G11B 5/17 : Construction or disposition of windings
• CPC Class Codes: G11B 5/86 : Re-recording, i.e. transcribing information from one magnetisable record carrier on to one or more similar or dissimilar record carriers by varying the order of the information G11B27/029, G11B27/036
• CPC Class Codes: G11B 7/0037 : with discs
• CPC Class Codes: G11B 7/005 : Reproducing G11B7/0065 takes precedence
• CPC Class Codes: G11B 7/0053 : Reproducing non-user data, e.g. wobbled address, prepits, BCA
• CPC Class Codes: G11B 7/00736 : Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information sector headers or adresses in prepits G11B7/00745; address data in track wobble G11B7/24082
• CPC Class Codes: G11B 7/24 : Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the arrangement of information on the carrier G11B7/007
• CPC Class Codes: G11B 7/24038 : Multiple laminated recording layers
• CPC Class Codes: G11B 7/26 : Apparatus or processes specially adapted for the manufacture of record carriers
• CPC Class Codes: G11B 7/28 : Re-recording, i.e. transcribing information from one optical record carrier on to one or more similar or dissimilar record carriers

Abstract

A recording and reproducing system for performing the reproduction using an optical recording medium. A physical feature of a ROM type disk is extracted and enciphered before being recorded in an optical disk. The cipher reproduced and converted into a plain text physical feature, which in turn, is compared with the physical feature information detected from the ROM disk. When both are coincident with each other, the operation of the system stops, thereby preventing the use of an illegally duplicated disk. The physical feature information, recorded on a magnetic recording layer 4 of the optical recording medium 2, is reproduced by an optical head 8 and compared with the information measured by a physical feature information detector, thereby detecting a duplicated medium.

Claims

1. An information reproducing system comprising means (17) for rotationally driving a disc-like optical recording medium (2) wherein information is recorded in a recording layer in the form of pits, an optical head (6) for reading out the recorded information from said optical recording medium, head-moving means (23) for making said optical head movable radially on said optical recording medium, and signal processing means for processing the information read out through said optical head, which system is characterized by including:

first physical information detecting means (743, 38,

     665) for detecting, on the basis of information read out through one of said optical head and a magnetic head, first physical feature information (532) which is representative of at least one of information of a two-dimensional physical arrangement of a pit or low-reflection section and a configuration of said pit or low-reflection section of said recording layer on said optical recording medium and which is enciphered and recorded at manufacture of said optical recording medium;

decryption means (534) for decoding the first physical feature information into a plain text using disclosed key cipher system cipher function (695b, 698B, 735h);

means (17a, 6, 38, 703a) for measuring a physical feature of said optical recording medium to detect second physical feature information indicative of at least one of information of a physical arrangement of said pit or low-reflection section and a configuration of said pit or low-reflection section;

check means (535) for checking said second physical feature information with said first physical feature information already decoded into a plain text to make a decision as to whether or not both are in a specific relation to each other; and

control means (717,

     665) for, when the check means decides that said second physical feature information is not in the specific relation to said first physical feature information, stopping one of an operation of a specific program read out from said optical recording medium, a subsequent reading-out of information from said optical recording medium, and a given process of information, read out from the optical recording medium, the given process being practiced by said signal processing means.

2. A system as defined in claim 1, characterized in that reproducing means detects, on the basis of an internal pressure of pits, a first low-reflection section (740) in which a reflected light quantity is small and a high-reflection section (741) in which a reflectance is higher than that of said first reflection section due to a portion with no pit, and in an apparatus for reproducing a first optical recording signal, second low-reflection section detecting means (586) detects a second low-reflection section (584) provided in an optical recording signal area (742) and having a reflectance lower than that of said first low-reflection section and providing a reflected light quantity smaller than that of said first low-reflection section, and said second physical feature information detecting means obtains said second physical feature information on the basis of a detection signal of said second low-reflection section detecting means.

3. A system as defined in claim 2, characterized in that said second low-reflection section detecting means detects said second low-reflection section by slicing said first optical recording signal at a first slice level of a first level slicer (386) of level slicers having two or more slice levels and by slicing a reproduced signal at a second slice level of a second level slicer (586) which corresponds to a light quantity smaller than a light quantity for said first slice level.

4. A system as defined in claim 3, characterized by further comprising second low-reflection section position detecting means (696) for detecting at least one of a position, circumferential length and circumferential interval of said second low-reflection section on the basis of a second low-reflection section detection signal of said second low-reflection section detecting means (586) and a first optical reproduced signal detected by reproducing means (590).

5. A system as defined in claim 4, characterized in that a time correction section (607) measures a time interval between a reference mark detection signal detected by a mark signal detecting means (593) and a reference second reflective section detection signal detected by said second low-reflection section detecting means (586) to obtain a reference correction time, and further said time correction section (607) corrects a time interval between a specific mark signal detection signal and a second reflective section detection signal on the basis of said reference correction time, before said second low-reflection section position detecting means (596) detects a position of said second reflective section detection signal.

6. A system as defined in claim 4, characterized in that, when a mark signal detecting section (593) detects a specific mark signal of said first optical reproduced signal, said second low-reflection section position detecting means (596) detects one of said position, said circumferential length and said circumferential interval of said second low-reflection section on the basis of a mark detection signal of said mark signal detecting section.

7. A system as defined in claim 6, characterized in that said mark signal detecting section (593) detects an address signal as said mark signal.

8. A system as defined in claim 7, characterized in that said second low-reflection section position detecting means (596) detects one of said position, said circumferential length and said circumferential interval of said second low-reflection section on the basis of said address signal and the number of reproduction clock signal counted by a counter (598).

9. A system as defined in claim 8, characterized in that said second low-reflection section position detecting means (596) detects said position of said second low-reflection section on the basis of said address signal, the number of frame synchronizing signals counted by said counter (598) and the number of said reproduction signals counted by said counter (598).

10. A system as defined in claim 7, characterized in that said second low-reflection section position detecting means (596) detects said position of said second low-reflection section on the basis of an address signal of said first optical reproduced signal and a frame synchronizing signal.

11. A system as defined in claim 7, characterized in that said second low-reflection section position detecting means (596) detects one of said position, said circumferential length and said circumferential interval of said second low-reflection section with the number of reproduced clocks of a synchronizing signal reproducing means (38a) which obtained from said first optical reproduced being counted by a counter (598).

12. A system as defined in claim 11, characterized in that said synchronizing signal reproducing means detects as a synchronizing signal a clock signal from a synchronizing clock reproducing means (38a) of an EFM demodulating means (592).

13. A system as defined in claim 6, characterized in that said mark signal detecting section (593) detects, as said mark signal, a specific signal of a sub-code signal of a CD.

14. A system as defined in claim 2, characterized in that said second low-reflection section detecting means (586) detects only said second low-reflection section longer than said first low-reflection section in a tracking direction.

15. A system as defined in claim 2, characterized in that said second physical feature information detecting means obtains said second physical feature information by detecting an angular position of said second low-reflection section on said recording medium on the basis of a first detection signal on said second low-reflection section detected by said second low-reflection section detecting means (586) and a second detection signal detected by an angle detecting means (355) of rotating means.

16. A system as defined in claim 2, characterized in that said second physical feature information detecting means obtains said second physical feature information by measuring start and end positions of said second low-reflection section on the basis of a second low-reflection section detection signal detected by said second low-reflection section detecting means (586) and at least one of a frame synchronizing signal and clock signal of a first optical reproduced signal detected by an optical reproducing means (590).