JP2000228034A - Optical disk and optical disk reproduction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the illicit use of software within a read-only disk by print ing the prescribed position on a flat surface formed on the side opposite to a reflection film on the rear of the reflection film in two colors with the intrin sic information of the disk by two inks of different color which can be optically decrypted. SOLUTION: The disk is so formed that the reflection film is not formed in an area DO6 for a decryption key and light transmits there in the production process of the disk. Next, the front surface of this area is printed with a decryption key signal. The front surface of the disk is printed with a lebel. A machine plate of the white ink and black ink for the lebel is simultaneously spot printed with the decryption key. The place to be printed with the decryption key is specified to the area around a central hole and may be other prescribed position on the disk and the printing is executed by a suitable method, such as silk screen printing or offset printing. Such decryption key is read by an optical pickup and whether the disk is illegal or not is checked. The reproduction of the information is ended in case of the illicit disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a read-only optical disk, and more particularly to a read-only optical disk with a label for preventing unauthorized use.

[0002]

2. Description of the Related Art C in which audio signals such as music are recorded
D (compact disc), CD on which computer software and game software are recorded, DVD on which video is recorded
(Digital video discs) and the like, the information recorded in digital signals on the disc is not deteriorated even if the information is copied many times.

[0003] For this reason, a copy of the above-described type of disk on which information is recorded by digital signals is easier to make than a copy of information recorded analogously on a conventional magnetic tape.
Unauthorized copies of so-called pirated discs hit the market and hurt the original author's interests.

[0004] Music and video recorded on a disc are protected by copyright law, but if it cannot be determined whether the disc is a disc created by a legitimate creator, software recorded on the disc cannot be determined. Is not sure if it violates copyright law. Therefore, publishers of those optical discs manufacture and ship the optical discs by printing and engraving identification information indicating that they are genuine products on the label surface or the innermost mirror surface area. I have.

[0005] The above-mentioned identification information is inconvenient to handle unless it is visually recognizable. However, if the identification information is visually recognizable, it is easy to manufacture duplicates, which is not very useful in preventing unauthorized copying. As a measure to overcome it,
A method has also been developed in which key information is recorded on a disc, the key information is read during playback, and the key information is compared with the key information notified to the owner of the disc and can be played back only when the key information matches. Was.

[0006]

However, in an optical disk of the type in which the key information is recorded, a sheet with an ID number is attached to a manual attached to the optical disk. This system plays back software recorded on an optical disk and inputs the ID number to a computer.

Therefore, when the above method is used, there are the following disadvantages. In other words, if the person making the copy knows only the ID number of the optical disk, the software can be copied and used illegally, so that it is not possible to prevent copying and using the optical disk. On the other hand, even if the person who uses the optical disk is a legitimate user, there is a trouble that the ID number described in the instruction manual must be input on the computer.

As a higher-level data protection mechanism, a medium such as a floppy disk is attached, and copy protection is performed using the data described therein. However, this method requires a medium such as a floppy disk, which leads to an increase in cost.

[0009]

In order to solve the above-mentioned problems, the present invention provides an optical disk provided with the following means and a reproducing method thereof.

That is, a transparent substrate having a flat surface forming the first surface and a back surface formed of a concave and convex surface on which information is recorded and covered with a reflective film, and the reflective film formed behind the reflective film And a protective layer having a second surface forming a flat surface on the opposite side of the optical disk, the label being printed on the second surface, wherein the optical disk has a predetermined position on the second surface. Further, there is provided an optical disc in which disc-specific information is printed in two colors with two different colors of ink which can be optically decoded.

According to one aspect of the present invention, the optical disk has a recording area for an optical signal for recognizing the optical signal as disc-specific information, a procedure signal recording area on which a procedure for recognizing the optical signal is written, And a data signal recording area.

According to another aspect of the present invention, in the optical disc, the optically decipherable disc specific information is silk-screen printed at a predetermined position on the second surface as a decipher key area. Alternatively, the printing is performed on the concentric circle simultaneously with the printing of the label portion by the offset printing so that the reflection film is not formed below the decoding key area.

According to still another aspect of the present invention, the decoding key area on the optical disk is printed by using an ink that absorbs a reading laser beam and an ink that reflects the reading laser beam, and decodes an optically readable decoding key signal. Print.

Further, the present invention includes a recording area of an optical signal for recognizing the optical signal as disc-specific information, a procedure signal recording area in which a procedure for recognizing the optical signal is written, and a data signal recording area. Provided is a method of reproducing a data signal from an optical disk, which method first reads a procedure signal and reads an optical signal representing disc-specific information according to an instruction of the signal.

As described above, according to the present invention, the following measures are taken to prevent unauthorized use of software recorded in a read-only disk. At the time of manufacture of a disc, two kinds of inks having optical reflection and absorption characteristics such as white ink and black ink are used in a specific area of the disc, that is, on a label surface of the disc or outside a recording area of software. By performing two-color printing simultaneously with label printing, a "decryption key" is recorded on a concentric circle of the disc. The recording area on the disc is composed of the following two areas. An area in which a procedure for confirming whether the disc is a legitimate disc is described; and an area in which data such as music, video, computer programs, etc. are recorded.

At the time of reproduction, the disc is set in the player as usual, and firstly, the first area recorded on the dedicated optical disc in which a procedure for confirming the decryption key is described is reproduced. According to the instruction, the decryption key is read by an optical pickup to check whether the disk is an illegal disk. Only after the legality of the disc is confirmed, the software recorded on the optical disc is loaded onto the computer.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a read-only optical disk according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic diagram illustrating an upper surface and a cross section of an optical disk. As shown in the figure, the disk has an uneven surface on which information is recorded formed on a substrate (substrate) D01, and a reflective film D02 is formed on the surface. Reflective film D
02 is formed on the protective film layer D03.
The label printing surface D04 is formed on the flat surface opposite to No. 3.

At the center of the disk, there is formed a center hole D05 into which a rotary driving spindle is fitted. In the disk of the present embodiment, the center hole D05 on the disk
, A decryption key area D06 is provided as shown in FIG. During operation, the information recorded on the disk surface is read by irradiating a laser beam from the surface of the disk on the substrate D01 side and detecting the laser light reflected by the reflection film. At this time, since no reflective film is formed below the decryption key area D06, the laser light projected from below the disc is applied to the decryption key printing surface printed on the same horizontal plane as the label printing surface on the upper surface side. Since the light is reflected and returns downward, the returned light is detected by the same detector as the detector for reading information.

As described above, the decryption key is printed in the decryption key area D06 on the disk. This will be described in more detail below. As shown in FIG. 1, an ordinary optical disk has a reflective film formed on an uneven surface on which information is recorded on a disk substrate. When a reading laser beam is projected from below the disk shown in FIG. The light is reflected by the film and returns to the lower direction in FIG.

In the optical disk of the present embodiment, the reflective film is not formed in the decryption key area D06 during the manufacturing process of the disk, and the disk is formed so that light is transmitted therethrough. Next, a decryption key signal is printed on the upper surface of this area. The printing of the decryption key signal is performed simultaneously with the label printing.

That is, in addition to manufacturing a disk consisting of a portion described as a normal disk in FIG. 1, a printing plate for forming a label printing surface is prepared, and a label is printed on the upper surface of the disk using the printing plate. I do. At this time, the decoding key is simultaneously burned into the printing plate of the white ink and the black ink for the label. Printing of the decryption key is performed using white ink and black ink. The place where the decryption key is printed is the area around the center hole in FIG. 1, but is not limited to this area, and can be determined at another predetermined position on the disk. The printing method is silk screen printing,
An appropriate printing method such as offset printing can be selected.

Next, a brief description will be given of the optical disk reproducing apparatus of the present embodiment having the above-described structure. FIG. 2 schematically illustrates a system configuration of a general optical disk reproducing apparatus, and a detailed structure is omitted. As shown in the figure, an optical disc G01 is a turntable (not shown).
It is placed on top and rotated by the motor G02 together with the turntable. The rotation speed of the motor G02 is controlled by a motor drive servo circuit G03.

An optical system G05 is provided below the disk G01, and can be moved in the radial direction of the disk G01 by an optical system feed servo circuit G08. A laser beam is projected from the light emitting portion of the optical system G05 onto the information recording surface of the disk G01, and the reflected light therefrom is reflected by the optical system G05.
The optical system G05 is received by the light receiving unit 05, and the focusing system G06 and the tracking circuit G07 are used to detect and correct the focus shift and the track shift by a known method. When the track shift becomes large, a signal is sent to the optical system feed servo circuit G08 to correct the position shift of the optical system.

The optical system G05 outputs information recorded on the optical disk G01 to a read signal output circuit G09. The information signal such as music or video read from the optical system G05 is subjected to signal processing by a signal output circuit and then output from an output G10 to a subsequent circuit. Note that information regarding control of the motor G02 and the optical system G05, such as a synchronization signal detected by the signal output circuit G09, is sent to the system control circuit G04. The system control circuit G04 sends control signals to the motor drive servo circuit G03 and the optical system feed servo circuit G08 to control the rotation speed of the motor and the movement of the optical system.

In the above optical disk reproducing apparatus, when a disk is mounted and reproduction is started during reproduction, the optical system G05 moves toward the innermost circumference of the disk G01, and the disk recording information recorded in the area on the inner circumference side. And operates to read information on the disc based on the information. For example, in the case of a disk on which music is recorded, TOC (Table of Content) is included in the inner lead-in.
s) is included, and the TOC is read, and the pickup of the optical system searches for the position and starts playing according to the instruction of the number of music written there.

When reproducing the optical disk of the present invention, a procedure for setting the disk in a player (reproducing apparatus) as usual and confirming the decryption key on the disk is described. Then, the decryption key is read by an optical pickup according to the procedure described in the area, and it is confirmed whether or not the disc is an illegal disc.

As a result of the confirmation, if it is determined that the disc is a legitimate disc, the disc can be reproduced according to a normal reproducing procedure, and the information recorded on the optical disc can be loaded into a computer. As a result of the confirmation, if it is determined that the disc is an unauthorized disc, the reproduction of the information is terminated.

As described above, the optical disk of the present invention does not require a special reproducing device, can be reproduced by using a normal reproducing device, and does not require a particularly advanced technique for manufacturing the disk. .

[0029]

Since the optical disk of the present invention has the above-described configuration, it is possible to prevent unauthorized use and copying of software with one disk. The optical disc of the present invention
Since reproduction can be performed by a normal disk reproduction method, the original purpose of illegal use of software and illegal copy can be prevented without making any change to the existing optical disk reproduction apparatus. Conventionally, when installing software on a computer, it has always been necessary to input an ID number by a key. However, when playing the optical disk of the present invention, the user is free from the trouble of inputting an ID number by a key.
Also, the manufacturer does not need to manufacture the seal of the ID number.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a structure of an optical disc according to an embodiment of the present invention.

FIG. 2 is a system configuration block diagram of an optical disk reproducing device.

[Explanation of symbols]

D01 substrate, D02 reflective film, D03 protective film layer, D04 label printing surface,
D05 center hole, D06 decryption key area

Claims (5)

[Claims] 1. A transparent substrate having a flat surface forming a first surface and a back surface formed of an uneven surface on which information is recorded and covered with a reflective film, and the reflective film formed behind the reflective film. A protective layer having a second surface forming a flat surface on the opposite side of the optical disk, the label being printed on the second surface, and a predetermined position on the second surface. And optically decipherable 2
An optical disk on which disk-specific information is printed in two colors with two different color inks. 2. The optical disc according to claim 1, wherein:
An optical disc including a recording area of an optical signal for recognition as disc-specific information, a procedure signal recording area in which a procedure for recognizing the optical signal is written, and a data signal recording area. 3. The optical disc according to claim 1, wherein
The optically readable disc-specific information is stored in the second
Is printed on a concentric circle at the predetermined position as a decryption key area on the surface at the same time as printing of the label portion by silk screen printing or offset printing, and a reflective film is formed below the decryption key area. No optical disc. 4. The optical disk according to claim 3, wherein
The decryption key area is printed by using an ink that absorbs a reading laser beam and an ink that reflects the laser beam, and prints an optically readable decryption key signal. 5. An optical signal recording area for recognizing the optical signal as disc-specific information, a procedure signal recording area in which a procedure for recognizing the optical signal is written, and a data signal from an optical disc including a data signal recording area. An optical disc reproducing method for reading a procedure signal first and reading an optical signal representing disc-specific information in accordance with an instruction of the signal.