Optical disk, optical disk recording and reproducing apparatus and copy preventive method for optical disks

• US 4,879,704 A
• Filed: 07/16/1987
• Issued: 11/07/1989
• Est. Priority Date: 07/21/1986
• 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: Takagi, Yuuji, Fukushima, Yoshihisa, Ichinose, Makoto, Satoh, Isao, Kuroki, Yuzuru
• Primary Examiner(s): Faber, Alan
• Assistant Examiner(s): Nguyen, Hoa T.
• Application Number:
  US07/074,291
• Time in Patent Office: 845 Days
• Field of Search: 369/14, 369/59, 369/47, 369/48, 369/49, 369/54, 369/58, 360/60
• US Class Current: 369/53.21
• CPC Class Codes: G06F 2211/007 Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
• 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 20/00702 said measures preventing that data are recorded on the recording medium
• CPC Class Codes: G11B 7/00745 Sectoring or header formats within a track formats in general G11B20/12

Abstract

In an optical disk system of the type including an optical disk for performing the recording and reproduction of data by use of a semiconductor laser and an optical disk recording and reproducing apparatus, an optical disk, optical disk recording and reproducing apparatus and copy preventive method for optical disks capable of preventing copying of the stored data from one optical disk on another. Irrespective of the kinds of optical disks, such as, read only-type optical disk, DRAW-type optical disk and erasable optical disk, each of the optical disks is provided in common with sectors from which data can be reproduced but not recorded on, i.e., data record-protected sectors and at least part of the stored data is stored in the record-protected sectors of the optical disk, thereby protecting the stored data from being recorded on the same address sectors of another recordable optical disk forming a part of the optical disk system.

Claims

1. An optical disk recording and reproducing apparatus for recording and reproducing data from an optical disk divided into a plurality of sectors each thereof being preliminarily formatted with an address with m and n each representing a given positive integer, said apparatus comprising:

means for only reproducing data from said optical disk sectors respectively designated by addresses B₀ to B_n ; and

means for recording and reproducing data from said optical disk sectors respectively designated by addresses A₀ to A_m,

said sectors designated by said addresses B₀ to B_n serving as record-protected sectors and being adapted for the reproduction of data only irrespective of said optical disk comprising a read only-type optical disk, a DRAW-type optical disk or an erasable optical disk,

whereby data having at least part thereof recorded on said record protected sectors designated by said addresses B₀ to B_n is protected from being recorded on the same address sectors of another recordable optical disk.

2. An optical disk having a program stored thereon and comprising a plurality of sectors each preliminarily formatted with an address, said optical disk being adapted for use with an optical disk recording and reproducing apparatus adapted, with m and n each representing a given positive integer, to perform only reproduction and no recording of data located on said sectors designated by addresses B₀ and B_n and to perform recording and reproduction of data located on said sectors designated by addresses A₀ and A_m, said sectors designated by addresses B₀ to B_n being record-protected sectors, said optical disk having a program stored thereon which operates on a computer, at least past of said program being stored on said sectors designated by addresses B₀ to B_n, said program including as a part thereof a physical address of each of said sectors on which said program is recorded, said program including a copy preventive process operating such that when said program is read, the physical addresses included in said program are compared with the physical addresses of said sectors previously storing said program to allow the subsequent operation of said program only when there is equality therebetween.

3. An optical disk having a program stored thereon and comprising a plurality of sectors preliminarily formatted with an address, said optical disk being adapted for use with an optical disk recording and reproducing apparatus adapted, with m and n each representing a given positive integer, to perform only reproduction and no recording of data located on said sectors designated by addresses B₀ and B_n and to perform the recording and reproduction of data located on said sectors designated by addresses A₀ to A_m, said sectors designated by addresses B_o to B_n being record-protected sectors, said optical disk having a program stored thereon which operates on a computer, at least part of said program being stored in said sectors designated by said addresses B₀ to B_n, said program including the physical addresses of said sectors to be read next as a program as a part thereof.

4. A copy protection method for an optical disk comprising the steps of:

providing an optical disk divided into a plurality of sectors, each formatted with an address, said sectors including a first group of sectors designated by respective addresses A₀ to A_m, and a second group of sectors designated by respective addresses B_o to B_n, where m and n are each positive integers, said sectors designated by addresses B₀ to B_n serving as data record-protection sectors and being adapted for only reproduction of data;

recording at least part of a body of stored data in said record-protected sectors B₀ to B_n ;

reading said optical disk with an optical disk recording and reproducing apparatus, said apparatus operating to reproduce only and not record data obtained from optical disk sectors designated by addresses B₀ to B_n and operating to record and reproduce data from said optical disk sectors designated by addresses A₀ to A_m, said apparatus operating so that said at least a part of said body of data contained in sectors designated as B₀ to B_n is not recordable on the same sector addresses of another optical disk by said apparatus.

5. A copy preventive method according to claim 4, wherein said body of stored data comprises a program which operates on a computer, wherein said program includes as a part thereof a physical address of each of said sectors in which said program is stored, and wherein said program includes a copy preventive process whereby when said program is read, said physical addresses included in said program are compared with the physical addresses of said sectors previously storing said program to allow the subsequent operation of said program only when there is equality therebetween.

6. A copy preventive method according to claim 4 wherein said body of stored data comprises a program which operates on a computer, and wherein said program includes in at least a portion thereof the physical addresses of said sectors to be read next as a part thereof.