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EP0553545A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

CD-ROM disk and security check method for the same

Assignee: Sega Corp
•
Filing: 1992-10-28
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Granted: —
•
Expires: 2012-10-28
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Abstract

Abstract A CD-ROM (10) comprises an identifier region (16a) having a disk identifier recorded therein and a security code region (16b) having a security code recorded therein. The identifier region and the security code region are provided in one sector of a boot sector (16) to be read when actuated. The disk identifier includes a preset identification code, and the security code includes at least a program to be executed after check of the security code, and display data for displaying a licence. A security check method for a CD-ROM comprising the steps of reading data recorded in the boot sector of the CD-ROM when actuated, comparing the disk identifier read from the identifier region of the boot sector with an stored identifier to check whether or not the read disk identifier is correct, comparing the security code read from the security region of the boot sector with a stored security code to check whether or not the read security code is correct, and executing the program contained in the security code when the read disk identifier and the read security code are correct, and displaying a licence based on the display data.

Inventors

  • 👤 Toshinori c/o K.K. Sega Enterprises Asai
  • 👤 Masaki c/o K.K. Sega Enterprises Kawohori

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-29 14:18
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/32; G11B27/327; G11B27/329; G06; G06F; G06F21/00; G06F21/10; G06F21/70; G06F21/78; G06F21/80; G11B19/00; G11B19/02; G11B19/10; G11B19/12; G11B20/00; G11B20/00086; G11B20/00094; G11B7/00; G11B7/002; G11B7/0037; G11B7/007; G11B7/00745; G11B7/013; A; A63; A63F; A63F2300/00; A63F2300/20; A63F2300/201; A63F2300/206; G06F2211/00; G06F2211/007; G06F2211/1097; G06F2221/00; G06F2221/21; G06F2221/2109; G11B2220/00; G11B2220/20; G11B2220/25; G11B2220/2537; G11B2220/2545

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 64 words
A CD-ROM (10) having a boot sector (16) including an identifier region (16a) in which a disk identifier is recorded and a security code region (16b) in which a security code is recorded, the disk identifier including a preset identification code, and the security code including a program to be executed after check of the security code and display data for displaying a licence.
Claim 2
Dependent Claim 21 words
A CD-ROM (10) according to claim 1 wherein the security code includes a LOGOTYPE data indicative of LOGOTYPE to be displayed.
Claim 3
Dependent Claim 64 words
A CD-ROM (10) according to claim 1 or claim 2 wherein the program includes: a first step in which head addresses of data recorded on the CD-ROM (10) are set in a register of the main CPU of the machine on which the CD-ROM (10) is operated; and a second step in which a required program routine stored in the said machine is executed.
Claim 4
Dependent Claim 113 words
A CD-ROM according to claim 1 or claim 2, wherein the program includes: a first step in which a sub-CPU provided in a machine on which the CD-ROM (10) is operated is temporarily paused; a second step in which the contents of the program memory of the sub-CPU are rewritten from data recorded on the CD-ROM (10); a third step in which operation of the temporarily paused sub-CPU is resumed; a fourth step in which head addresses of data recorded on the CD-ROM are set in a register of the main CPU of the said machine; and a fifth step in which a required program routine stored in the said machine is executed.
Claim 5
Dependent Claim 193 words
A security check method for a CD-ROM (10) having a boot sector (16) including an identifier region (16a) in which a disk identifier is recorded and a security code region (16b) in which a security code is recorded, the disk identifier including a preset identification code, and the security code including a program to be executed after check of the security code and display data for displaying a licence, the security check method comprising: a first step of reading data recorded in the boot sector of the CD-ROM when actuated; a second step of comparing the disk identifier read from the identifier region (16a) of the boot sector (16) with a stored identifier to check whether or not the read disk identifier is correct; a third step of comparing the security code read from the security region (16b) of the boot sector (16) with a stored security code to check whether or not the read security code is correct; and a fourth step of executing the program contained in the security code when the read disk identifier and the read security code are correct, and displaying a licence based on the display data.
Claim 6
Dependent Claim 37 words
A security check method according to claim 5 wherein the security code includes a LOGOTYPE data indicative of LOGOTYPE to be displayed, and wherein the fourth step further includes displaying a LOGOTYPE based on the LOGOTYPE data.
Claim 7
Dependent Claim 61 words
A security check method according to claim 5 or claim 6 wherein the fourth step includes: a first step of setting addresses of data recorded in the CD-ROM (10) in a register of the main CPU of a machine on which the CD-ROM (10) is operated; and a second step of executing a required program routine stored in the said machine.
Claim 8
Dependent Claim 108 words
A security check method according to claim 5 or claim 6, wherein the fourth step includes: a first step in which a sub-CPU provided in a machine on which the CD-ROM (10) is operated is temporarily paused; a second step of rewriting the contents of the program memory of the sub-CPU from data recorded on the CD-ROM (10); a third step of resuming operation of the temporarily paused sub-CPU; a fourth step of setting addresses of data recorded on the CD-ROM (10) in a register of the main CPU of the said machine; and a fifth step of executing a required program routine stored in the said machine.

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