JPH10208388A - Optical disc cipher key generating method, cipher key recording method, cipher key recording device, information reproducing method, information reproduction permitting method, and information reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower the value of information to be paid by a user and the price of a disk itself, to prevent an illegal copy, and to facilitate the management of cipher key. SOLUTION: A disk reproducing device 2 reads information characteristic of a recording medium 1 where information is recorded for discriminating the recording medium from other recording media out of the recording medium and reads out an arbitrary password code that the user of the recording medium 1 has set, and a software house 3 performs arithmetic process based upon specific algorithm by using the information and password code characteristic of the recording medium 1 to generate a cipher key for reading information out of the recording medium 1. When the user wants to read the information out, the disk reproducing device 2 allows part or the whole of the information recorded on the recording medium 1 to be erased according to a password code which is inputted at this time and the cipher key, which has been generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to management of reproduction permission at the time of reproducing information recorded on an optical disk such as a DVD (digital video disk: digital versatile disk). The present invention relates to an optical disk, an encryption key generation method, an encryption key recording method, an encryption key recording device, an information reproduction method, an information reproduction permission method, and an information reproduction device which can prevent the above.

[0002]

2. Description of the Related Art In general, in a disk package medium such as a CD, all information recorded on a disk is disclosed to the disk owner. Information can be used. Therefore, FIG.
As shown in the table, the price of the disc is set for all information recorded on the disc, and the consumer becomes the disc owner by paying the price and purchasing the disc, and as a result, the disc is recorded. You can use all the information.

[0003] As another distribution form, a "super distribution system" is known. This system is based on the idea of paying not for "owning" but for "use" of digital information. When applied to a DVD as shown in FIG. soft)
The DVD player that reproduces the information is provided with an IC card connector and a communication port. Reproduction limit data is stored in the IC card in advance, and this data is reduced every time information is reproduced. The communication port is connected to the computer of the software supplier via a telephone line, and collects a DVD playback fee and sets a playback frame.

[0004] By the way, since the disc itself can be manufactured at very low cost, most of the above considerations are for the quality and quantity of all information recorded on the disc. However, in such a system,
Even if the user wants to reproduce only specific information instead of all information recorded on the disc, there is a problem that the user must pay for all information. Conversely, a variety of discs with slightly different contents may have to be manufactured in anticipation of various consumer requirements.

[0005] These are not only inconvenient for consumers, but also for producers, which increase costs and complicate distribution. The above-mentioned "super-distribution system" solves the above problem in terms of the price for information, but requires a large-scale system, such as exchanging information usage status and usage restriction information via a communication network. .

On the other hand, after the optical disk is manufactured, a part of the information recording surface of the optical disk is irradiated with a powerful laser beam or the like to permanently deform the substrate of the optical disk or the reflection film on the substrate, thereby reducing the recording density of the optical disk. Methods for recording much lower density information are described, for example, in US Pat.
No. 319 and the like. Since different information can be written for each disk by such a technique, an encryption key can be set for each disk, and an illegal act such as illegal copying of a disk or reuse of an encryption key becomes impossible. .

Therefore, the inventor has previously set, for example, an ID unique to a recording medium, an ID of information to be reproduced, and an ID of a reproducing apparatus, and combines at least two of these three IDs to generate an encryption key. Has developed a method of generating a patent and filed a patent application (filing date: December 3, 1996;
Title of the invention: encryption key generation method, optical disk reproduction method, optical disk reproduction device, and optical disk reproduction permission method;
Reference number: 04000675; Applicant: Victor Company of Japan, Ltd.). According to this proposed invention (unpublished at the time of filing the present application), a user obtains an optical disk and once contacts a software supplier, permits reproduction of desired information on condition that payment for information is paid. An encryption key can be obtained.

According to the above-mentioned undisclosed proposed invention, information unique to a recording medium, information unique to a reproducing apparatus, and the like are transmitted to the software supplier by any means such as telephone, personal computer communication, and mail. Since the software provider generates the encryption key and provides it to the user, it is only necessary to transmit the credit card number to the software supplier without using an IC card or the like as in the super-distribution system. More convenient and more realistic than a super distribution system.

[0009]

However, according to the above-mentioned undisclosed proposed invention, when an encryption key is generated using information unique to a recording medium, an optical disk ID and the like are processed by a predetermined algorithm. Since the encryption key is generated, if the recording medium is different, the encryption key will be different. That is, when using a plurality of recording media, an encryption key is generated for each recording medium, so that the user can memorize all these different encryption keys and their corresponding recording media, or hold them in a storage device, It is necessary to control which recording medium the encryption key belongs to. Such management is considerably troublesome as the number of recording media increases, and becomes a burden on the user.

[0010] Therefore, the present invention has been made in view of the above-mentioned conventional problems and the problems of the above-mentioned undisclosed proposed inventions, and has made it possible to reduce the price of information to the user and the cost of the disc itself, thereby preventing unauthorized copying. It is another object of the present invention to provide an optical disk, an encryption key generation method, an optical disk reproduction method, an optical disk reproduction apparatus, and an optical disk reproduction permission method that do not require complicated encryption key management by a user.

[0011]

According to the present invention, in order to achieve the above object, information unique to a recording medium for identifying a recording medium on which information is recorded from another recording medium is read from the recording medium, and a user of the recording medium is read. Reads an arbitrary password set by the user, performs an arithmetic processing by a predetermined algorithm using the information unique to the recording medium and the password, and generates an encryption key for reading the information from the recording medium. When it is desired to read the information, the reproduction of a part or all of the information recorded on the recording medium is permitted based on the password input at this time and the encryption key generated previously. Further, according to another aspect of the present invention, in addition to the information unique to the recording medium and the personal identification number, a predetermined algorithm is used by using information for specifying at least one of a plurality of pieces of information recorded on the recording medium. The arithmetic processing may be performed to generate an encryption key for reading information from the recording medium. Recording the generated encryption key in a predetermined recording area of a recording medium is a preferred embodiment of the present invention. It is a preferred embodiment of the present invention to use an area that is continuous or adjacent to an area where information unique to a recording medium is recorded as the predetermined recording area. It is a preferred embodiment of the present invention to use a magnetic recording area provided on a recording medium as the predetermined recording area.

That is, according to the present invention, an optical disk on which information is recorded is distinguished from another optical disk by a first area in which information specific to the optical disk is optically recorded, information specific to the optical disk, an arbitrary password, and Or, in addition to the above, using information specifying at least one of a plurality of pieces of information recorded on the optical disc, performing an arithmetic processing using a predetermined algorithm, and generating an encryption code for reading information from the optical disc. An optical disc is provided, which is an area for additionally writing a key by optical recording, has the same format as the recording format of the first area, and has a second area continuous or adjacent to the first area.

According to the invention, a step of reading from the recording medium information unique to the recording medium for identifying the recording medium on which the information is recorded from another recording medium, and a step of setting arbitrary information set by a user of the recording medium Reading a personal identification number; and performing an arithmetic processing using a predetermined algorithm using the information unique to the recording medium and the personal identification number, and generating an encryption key for reading out the information from the recording medium. An encryption key generation method is provided.

According to the present invention, a step of reading from the recording medium information unique to the recording medium for identifying a recording medium on which information is recorded from another recording medium; Reading a password, reading information specifying at least one of a plurality of pieces of information recorded on the recording medium set by the user, and information unique to the recording medium, the password, and the plurality of pieces of information. Using an information specifying at least one of the information to perform an arithmetic processing by a predetermined algorithm to generate an encryption key for reading the information from the recording medium. .

According to the present invention, a step of reading from the recording medium information unique to the recording medium for identifying a recording medium on which information is recorded from another recording medium; Reading a password, performing an arithmetic process using a predetermined algorithm using the information unique to the recording medium and the password, and generating an encryption key for reading information on the recording medium; An encryption key recording method is provided, which comprises a step of appending a key to an area where information unique to the recording medium is recorded and an area continuous or adjacent to the area.

According to the present invention, a step of reading from the recording medium information unique to the recording medium for identifying a recording medium on which information is recorded from another recording medium, and a step of setting an arbitrary information set by a user of the recording medium Reading a password, reading information specifying at least one of a plurality of pieces of information recorded on the recording medium set by the user, and information unique to the recording medium, the password, and the plurality of pieces of information. Using an information specifying at least one of the information to perform an arithmetic processing by a predetermined algorithm to generate an encryption key for reading the information on the recording medium; Is added to an area where a is recorded and an area continuous or adjacent to the key.

Further, according to the present invention, means for reading from the recording medium information unique to the recording medium for identifying the recording medium on which the information is recorded from other recording media, and an arbitrary user set by the user of the recording medium Means for reading a password,
Means for transmitting the information unique to the recording medium and the personal identification number to a predetermined encryption key generation device; means for receiving an encryption key from the encryption key generation device; An encryption key recording device is provided which has means for additionally writing in a continuous area or an adjacent area.

Further, according to the present invention, means for reading from the recording medium information unique to the recording medium for identifying a recording medium on which information is recorded from another recording medium, and an arbitrary set by a user of the recording medium Means for reading a password,
Means for reading at least one of a plurality of pieces of information recorded on the recording medium set by the user; and identifying at least one of the information unique to the recording medium, the password, and the plurality of pieces of information. Means for transmitting information to be encrypted to a predetermined encryption key generation device, means for receiving an encryption key from the encryption key generation device, and means for making the encryption key continuous or adjacent to an area where information unique to the recording medium is recorded. Means for appending to an area.

According to the present invention, when reproducing information from a recording medium in which information and information for identifying it from another recording medium are recorded in advance, the recording medium in which the information is recorded is used. Reading the information unique to the recording medium from the other recording medium, and reading an encryption key recorded in an area continuous or adjacent to the area where the information unique to the recording medium is recorded. Generating a password for reproducing part or all of the information recorded on the recording medium based on the information unique to the recording medium and the encryption key; and recording the password based on the password. Allowing the reproduction of part or all of the information recorded on the medium.

According to the present invention, when reproducing information from a recording medium in which information and information for identifying it from another recording medium are recorded in advance by a reproducing apparatus, a recording medium on which the information is recorded Reading the information unique to the recording medium from the other recording medium, and reading an encryption key recorded in an area continuous or adjacent to the area where the information unique to the recording medium is recorded. And at least one of the information unique to the recording medium, the encryption key, and a plurality of pieces of information recorded on the recording medium.
Generating a personal identification number for reproducing part or all of the information recorded on the recording medium based on the information specifying one; and information recorded on the recording medium based on the personal identification number. Allowing the reproduction of part or all of the information.

According to the invention, when reproducing information from a recording medium in which information and information for identifying it from another recording medium are recorded in advance by a reproducing apparatus, the recording medium on which the information is recorded is recorded. Reading the information unique to the recording medium from the other recording medium, and reading an encryption key recorded in an area continuous or adjacent to the area where the information unique to the recording medium is recorded. Reading a password input by a user; and information identifying at least one of a plurality of pieces of information recorded on the recording medium based on the information unique to the recording medium, the encryption key, and the password. And reproducing a part or all of the information recorded on the recording medium based on the information specifying at least one of the plurality of pieces of information. A step of variable-information reproducing method having is provided.

According to the present invention, when a user reproduces information by a reproducing apparatus from a recording medium in which information and information unique to the recording medium for identifying the information from another recording medium are recorded in advance, An information reproduction permission method for determining whether to permit reproduction of information by the user on a recording medium provider side, wherein the information unique to the recording medium read from the recording medium and the user Receiving the input personal identification number from the reproducing apparatus side, identifying at least one of the information unique to the recording medium, the personal identification number, or, in addition to the above, a plurality of pieces of information recorded on the optical disc. Generating an encryption key for reproducing part or all of the information recorded on the recording medium based on the information to be recorded, and a part of the information recorded on the recording medium. Is and transmitting the encryption key to allow the reproduction of all the reproducing apparatus, information reproduction permission process with is provided.

According to the present invention, there is also provided a reproducing apparatus for reproducing information from a recording medium in which information and information for identifying the information from another recording medium are recorded in advance, the recording medium having the information recorded thereon. Means for reading, from the recording medium, the information unique to the recording medium for identifying the information from another recording medium, and means for reading an encryption key recorded in an area continuous or adjacent to the area in which the information unique to the recording medium is recorded When,
Means for generating a password for reproducing part or all of the information recorded on the recording medium based on the information unique to the recording medium and the encryption key; and Means for permitting reproduction of part or all of the recorded information.

Further, according to the present invention, there is provided a reproducing apparatus for reproducing information from a recording medium in which information and information for identifying the information from another recording medium are recorded in advance, the recording medium having the information recorded thereon. Means for reading, from the recording medium, the information unique to the recording medium, which identifies the information from another recording medium, and means for reading an encryption key recorded in an area continuous or adjacent to the area where the information unique to the recording medium is recorded. When,
Reproducing part or all of the information recorded on the recording medium based on the information unique to the recording medium, the encryption key, and information specifying at least one of a plurality of pieces of information recorded on the recording medium. Means for generating a password for
Means for permitting reproduction of part or all of the information recorded on the recording medium based on the password.

Further, according to the present invention, an optical disk on which information specific to the optical disc is optically recorded, which distinguishes the optical disc on which information is recorded from other optical discs, the information specific to the optical disc and an optional password, or And at least one of a plurality of information recorded on the optical disc.
And an area for magnetically recording an encryption key generated for reading information from the optical disk by performing an arithmetic process using information identifying the information and an algorithm.

According to the present invention, a step of reading from the recording medium information unique to the recording medium for identifying a recording medium on which information is recorded from another recording medium, and a step of setting arbitrary information set by a user of the recording medium Reading a password, performing an arithmetic process using a predetermined algorithm using the information unique to the recording medium and the password, and generating an encryption key for reading information on the recording medium; Recording a key in a magnetic recording area provided on the recording medium.

According to the present invention, a step of reading from the recording medium information unique to the recording medium for identifying a recording medium on which information is recorded from another recording medium, and an optional step of setting by the user of the recording medium Reading a password, reading information specifying at least one of a plurality of pieces of information recorded on the recording medium set by the user, and information unique to the recording medium, the password, and the plurality of pieces of information. Using information specifying at least one of the information to perform an arithmetic process using a predetermined algorithm to generate an encryption key for reading out the information on the recording medium; and providing the encryption key on the recording medium. Recording in a magnetic recording area.

Further, according to the present invention, means for reading from the recording medium information unique to the recording medium for identifying the recording medium on which the information is recorded from other recording media, and an arbitrary user set by the user of the recording medium Means for reading a password,
Means for transmitting the information unique to the recording medium and the personal identification number to a predetermined encryption key generation device; means for receiving an encryption key from the encryption key generation device; and a magnetic device provided with the encryption key provided on the recording medium. Means for recording in a recording area.

According to the present invention, means for reading from the recording medium information unique to the recording medium for identifying the recording medium on which the information is recorded from other recording media, and an arbitrary set by the user of the recording medium Means for reading a password,
Means for reading at least one of a plurality of pieces of information recorded on the recording medium set by the user; and identifying at least one of the information unique to the recording medium, the password, and the plurality of pieces of information. Means for transmitting information to a predetermined encryption key generation device, means for receiving an encryption key from the encryption key generation device, and means for recording the encryption key in a magnetic recording area provided on the recording medium, Is provided.

According to the present invention, when information is reproduced by a reproducing apparatus from a recording medium in which information and information for identifying from another recording medium are recorded in advance, the recording medium in which the information is recorded Reading information unique to the recording medium from the other recording medium, reading the encryption key recorded in a magnetic recording area provided in the recording medium, and reading the information unique to the recording medium. Generating a password for reproducing part or all of the information recorded on the recording medium based on the information and the encryption key; and information recorded on the recording medium based on the password. Allowing the reproduction of part or all of the information.

According to the present invention, when information is reproduced by a reproducing apparatus from a recording medium in which information and information for identifying it from other recording media are recorded in advance, the recording medium in which the information is recorded Reading information unique to the recording medium from the other recording medium, reading the encryption key recorded in a magnetic recording area provided in the recording medium, and reading the information unique to the recording medium. A password for reproducing a part or all of the information recorded on the recording medium based on the information, the encryption key, and information specifying at least one of the plurality of pieces of information recorded on the recording medium. An information reproducing method is provided, comprising: a generating step; and a step of permitting reproduction of part or all of information recorded on the recording medium based on the password. That.

According to the present invention, when reproducing information from a recording medium in which information and information for identifying it from another recording medium are recorded in advance, the recording medium on which the information is recorded is reproduced. Reading the information unique to the recording medium from the other recording medium, reading the encryption key recorded in a magnetic recording area provided on the recording medium, and inputting a password entered by a user. Reading a number, generating information identifying at least one of a plurality of pieces of information recorded on the recording medium based on the information unique to the recording medium, the encryption key, and the password, Permitting reproduction of part or all of the information recorded on the recording medium based on information that specifies at least one of the plurality of pieces of information. That information reproducing method is provided.

According to the present invention, there is also provided a reproducing apparatus for reproducing information from a recording medium in which information and information for identifying the information from another recording medium are recorded in advance, wherein the recording medium stores the information. Means for reading from the recording medium the information unique to the recording medium for identifying the information from another recording medium; means for reading an encryption key recorded in a magnetic recording area provided on the recording medium; and Means for generating a password for reproducing part or all of the information recorded on the recording medium based on the information and the encryption key; and information recorded on the recording medium based on the password. Means for permitting the reproduction of part or all of
An information reproducing apparatus having the same is provided.

According to the present invention, there is also provided a reproducing apparatus for reproducing information from a recording medium in which information and information for identifying the information from another recording medium are recorded in advance, wherein the information is recorded on the recording medium. Means for reading from the recording medium the information unique to the recording medium for identifying the information from another recording medium; means for reading an encryption key recorded in a magnetic recording area provided on the recording medium; and A password for reproducing a part or all of the information recorded on the recording medium based on the information, the encryption key, and information specifying at least one of the plurality of pieces of information recorded on the recording medium. An information reproducing apparatus is provided, comprising: a generating unit; and a unit that permits reproduction of a part or all of information recorded on the recording medium based on the password.

[0035]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing an embodiment of an encryption key generating method, an optical disk reproducing method, an optical disk reproducing device, and an optical disk reproducing permission method according to the present invention. FIG. 2 is a flowchart for explaining processing in the optical disk reproducing device of FIG. FIG. 3 is a flowchart for explaining processing in the software house of FIG.

FIG. 1 shows an example in which an optical disk 1 on which game software is recorded is reproduced by a disk reproducing device 2.
Also, a system is shown in which a software house 3 which is a provider of software (hereinafter referred to as software) collects the price of reproduction from a user of the disk reproducing apparatus 2. In this system, the disk 1 is free or very inexpensive as an appendix such as a magazine. Provided to the user (illustration). In the information area of the disc 1, for example, 50 pieces of game software and unique information for identifying the disc 1 from other discs (hereinafter referred to as disc I
D) is recorded. Also, for each individual game software,
Alternatively, unique information (hereinafter, title key) is set so as to include all the game software. In this embodiment, the title key and the serial number of the software correspond one-to-one. Alternatively, a title key may correspond to, for example, a software file name. As will be described later, the software house 3 as the disk provider and the disk reproducing apparatus 2 as the user can communicate with each other via a communication line or the like. Shall have.

Further, in the sector header of the disk 1, for example, address information of an area (for example, the first scene for each software) for which reproduction is permitted even if an encryption key is not input, and reproduction is performed on condition that the encryption key is input. The address information of the permitted area (software main body) is recorded. When playing back the disc 1, the disc reproducing apparatus 2 can reproduce, for example, the first scene of the software for each software, but cannot reproduce the software unless an encryption key is input thereafter. ing.

The recording method of the disc ID is as follows.
For example, as shown in U.S. Pat. No. 5,400,319, after recording information at a density much lower than the recording density on the surface of the disk 1, the binary data "1" or "0" indicating the disk ID is used. At the position of data "1" by irradiating a strong laser beam modulated by the laser beam, the reflective film of the disk 1 is permanently deformed, thereby forming a bar code such as "reflection = 1", "reflection = 0". Can be recorded. In this embodiment, DV is used as an example of the disk ID.
The BCA number used in D is recorded, and this BCA number is read by the disk reproducing device 2 and displayed, for example, as a decimal number.

The BCA is an area in which a barcode is formed by a strong light beam such as a YAG laser beam over a plurality of innermost tracks of an optical recording portion of an optical disk, and an area where a barcode can be additionally written. And it is also called a burst cutting area. What is a BCA number?
Among the information recorded as a barcode in the BCA, the information is unique to each disc. The disc is not limited to the BCA, and a disc may be provided with a portion using another recording method such as a magnetic recording area and read out by a dedicated head.

The disk reproducing device 2 is provided with a numeric keypad for a user to input a password. The password, the BCA number, and a code for generating a title key encryption key as information for specifying at least one of a plurality of pieces of information recorded on the optical disc 1 are used.

When the disc 1 is set, the disc reproducing apparatus 2 reproduces and displays only the area permitted to be reproduced without an encryption key. Thus, the user can know the outline or the beginning of the desired software to be reproduced, but the encryption key of the software is unknown to the user. Here, as an example, the title key of the desired software number “01” is “08001”.

First, the disc reproducing apparatus 2 or the user sends the BCA number of the disc 1 (for example, “00123”) to the software house 3 via, for example, a modem or a PB signal and a telephone line or an ISDN line.
And a password arbitrarily set by the user (for example, "0101
0)) and a credit card number for payment and a desired software number "01" (illustration). In this case, the encryption key that permits playback is, for example,

[0043]

## EQU1 ## Encryption key = “Title key” − “BCA number” − “Password” = 08001-00123-01010 = 06868

It is assumed that Next, the software house 3 sends this encryption key to the disk reproducing device 2 using a modem or the like, for example, under the condition of paying for the reproduction of the software number “01” of the disk 1 (illustration).

FIGS. 2 to 6 show a processing procedure in the disk reproducing apparatus 2 and the software house 3, wherein an encryption key is generated through communication with the software house 3 in FIG. The generation is shown. First, FIG. 2 shows a procedure for transmitting predetermined information to the software house 3 in the disc reproducing apparatus 2. First, the disk ID is read in step S1, and the user is requested to input a password in step S2. The user determines an arbitrary password and inputs the password using a ten-key (not shown) of the disc reproducing apparatus 3. When the input of the personal identification number is confirmed in step S3, the input of the number of the software to be reproduced is requested in step S4, and the input is confirmed in step S5. Next, in step S6, an input of a credit card number is requested, and the input is confirmed in step S7.
When these pieces of information are input, each piece of information is transmitted to the software house 3 in step S8, and completion of the transmission is confirmed, and the transmission process ends.

FIG. 3 is a flowchart showing a processing procedure on the software house 3 side. When the software house 3 confirms in step S11 that it has received information from the user, that is, the information from the disk reproducing device 2, it generates an encryption key by the above-described method in step S12, and then transmits the generated encryption key to the user in step S13. I do. When completion of transmission is confirmed in step S14, predetermined billing processing is performed using the credit card number of the user received in step S15, and the processing on the software house 3 side ends.

FIG. 4 shows a procedure for writing the encryption key transmitted from the software house 3 to the optical disk 1 in the disk reproducing device 2. That is, if the reception of the encryption key is confirmed in step S18, the received encryption key is written in a predetermined area of the disk in step S19, and the end of the writing is confirmed in step S20, and the process is terminated. Therefore, the disk reproducing device also operates as an encryption key recording device. As the predetermined area of the disc, a BCA write-once area can be used. The BCA additional recording area is a BCA in which the disc ID is recorded as a BCA number.
This is a part of the CA, which is continuous or adjacent to the area where the BCA number is recorded. As a continuous area, BC
There is a barcode-writable area in the circumferential direction of the recording area of the disk ID in A, and the adjacent area is a barcode-writable area similarly adjacent in the radial direction of the disk.

Next, a procedure for reproducing desired information from the optical disk 1 will be described with reference to FIG. FIG. 5 is a flowchart showing a processing procedure of the reproduction permission in the disk reproducing device 2. Now, it is assumed that the optical disk 1 has recorded the encryption key generated by the software house by the processing of FIG. 4 described above. In step S21, the disk ID is read, and then in step S22, the encryption key is read. All of this information is recorded in the BCA and is read out as a barcode. If the existence of the encryption key is confirmed in step S23, the title key is detected in step S24. The detection of the title key is to find a number corresponding to the number of the software to be reproduced input by the user on a one-to-one basis. For example, a title key 08001 corresponding to the software number 001 is detected.

In step S25, steps S21, S
22, the disk ID and encryption key read out at step S
Using the title key detected at 24, a password is calculated as shown in the following equation.

[0050]

## EQU2 ## PIN = “title key” − “BCA number” − “encryption key” = 08001-00123--06868 = 001010

The password thus calculated is called a calculated password. Next, in step S26, the user is requested to input a personal identification number. This password is called an input password. In step S27, it is determined whether or not the input password has been input. If the input password has been input, it is determined in step S28 whether or not the input password matches the calculated password. If they match, the reproduction of the software number "01" of the disc 1 corresponding to the title key "08001" is permitted to permit the reproduction of the title in step S29. If they do not match, and the encryption key is not detected in step S23. If so, in step S30, the reproduction is not permitted so that the reproduction of the software cannot be executed.

In the above embodiment, the password is calculated to determine whether or not the password matches the password input by the user. However, the present invention is not limited to this, and the title key is calculated using the input password. You may make it. FIG. 6 is a flowchart showing a procedure for calculating a title key and determining whether or not to permit reproduction of software. The same steps as those in FIG. 5 are denoted by the same step numbers, and a description thereof will be omitted. In the flowchart of FIG.
When the existence of the encryption key is confirmed in step S26, the user is requested to input a personal identification number in step S26. When the input is confirmed in step S27, the title key is calculated in step S31 as shown in the following equation. I do.

[0053]

## EQU3 ## Title key = “BCA number” + “encryption key” + “PIN” = 000123 + 06868 + 01010 = 08001

Next, it is determined whether or not a title corresponding to the title key calculated in step S32 exists on the optical disc 1. If there is, the reproduction of the title is permitted in step S29. On the other hand, when the title does not exist and when the encryption key is not detected in step S23, the reproduction is not permitted in step S30.

In other words, the user of the disc reproducing apparatus 2 can freely reproduce information that does not require payment for the software house 3 even if the user holds the disk 1, but can reproduce information thereafter. The software cannot be reproduced unless the price is paid to the software house 3 and the encryption key is obtained from the software house 3.

In the above embodiment, the disk ID is 00
Although the number is 123, a case where information is reproduced from another disk will now be considered. Disk I of this another disk
Let D be 00150. As described above with reference to FIG. 3, the software house 3 generates an encryption key, but the disk ID is 00150, the password is 1010, and the title key is 80.
If 01, the encryption key is 06841. This new encryption key is recorded on this disk by the processing of FIG. A secret number or a title key is generated using this encryption key. Therefore, when information is reproduced from this disk, desired software can be reproduced by inputting the same password 01010 as in the case of the disk with the disk ID 00123 described above.

In the above embodiment, the generated encryption key is BC
A has been described as being recorded in an additional portion of A, that is, a region that is continuous or adjacent to the recording region of the disk ID,
The encryption key can also be recorded by magnetic recording in a magnetic recording area provided in a so-called label part further inside the optical recording area of the disk.

The above-described encryption key generation method is for simplifying the description, and is actually generated based on a complicated encryption generation logic (algorithm) in order to enhance security. The number of digits of the disc ID and the password is also an example. For example, instead of using a number as the password, alphabetic characters and symbols may be used, or the number of digits may be changed as a combination of numbers and characters. It can be said that the larger the number of digits of the personal identification number is, the more resistant to unauthorized use. However, if the number of digits is too large, storage and input become troublesome.

Further, in the above embodiment, the title key is described as information for specifying one of a plurality of pieces of information recorded on the disc, but the title key may be handled as reproduction permission information for information on the entire disc. Further, the title key can be handled as information for specifying a combination of a plurality of pieces of information recorded on the disc. For example, if 4 bytes = 32 bits are assigned as a title key, 32 types of information can be specified corresponding to each bit, so that the title key can be handled as reproduction permission information for a plurality of pieces of information.

The disc ID is not necessarily the BCA number itself, but may be encoded in the reproducing apparatus so that the information of the BCA number is accurately included. In this case, the playback device must also have a decoding function, but this is an effective method for improving the confidentiality of the encryption key. In the above embodiment, the disc reproducing apparatus is described as operating also as an encryption key recording apparatus. However, instead of providing the function related to the disk reproduction apparatus, an encryption key recording apparatus is separately provided, and the encryption key recording apparatus is provided. The encryption key received by the apparatus may be input and added as a barcode in the disk ID area or by magnetic recording in the magnetic recording area.

The encryption key returned from the software supplier does not necessarily have to be the encryption key itself, and may be encoded in a form unknown to the user. In this case, the data is decoded at the time of recording the encryption key or at the time of reading the encryption key for disc reproduction, and a title key is generated. The encryption key information additionally written in the disc ID recording area can be additionally written as long as the unrecorded area remains in the disc ID recording area, and can be rewritten in a simulated manner, so that the password set by the user is temporarily inconvenient. In that case, the password can be changed by contacting the software supplier again. Also, in a disk having a magnetic recording area, the encryption key information recorded in the magnetic recording area is rewritable, so if the password set by the user becomes inconvenient, the software The password can be changed by contacting us. Similarly, when there is a plurality of pieces of information included in the disc and information to be used is to be added later, a new encryption key may be added or replaced with a new encryption key including old encryption key information. . In this case, the same password as before can be used, which is convenient.

Further, different passwords can be set for a plurality of pieces of information, and the reproduction can be restricted by an arbitrary combination of titles. Further, the information that specifies at least one of the plurality of pieces of information recorded on the recording medium is synonymous with the information that permits reproduction of at least one of the plurality of pieces of information recorded on the recording medium, and the reproduction restriction information itself. It is. Therefore, the information used as the title key in the embodiment may be the reproduction restriction information, and when there is one title (one information), it corresponds to the reproduction permission information of the recording medium.

Therefore, according to such a method, when the user wants to reproduce only specific information instead of all information recorded on the disc 1, the user only has to pay for the information. The price can be reduced and illegal reproduction can be prevented. In addition, since the disk 1 on which a large amount of information is recorded can be mass-produced, the disk 1 can be made inexpensive.

[0064]

As described above, according to the present invention, since an encryption key is automatically generated using a password arbitrarily set by a user, it is not necessary for the user to manage complicated encryption keys. By using a password common to a plurality of disks, selective reproduction of information can be permitted. Therefore, the convenience of the user can be achieved, the price of the information and the disc itself can be reduced, and illegal copying can be prevented.

To summarize the effects of the present invention, discs can be distributed at a low cost because information is charged for the information itself, and consumers only have to pay for the information part they need. Since the disk is distributed at extremely low prices, no pirated copy is established and the distribution destination of the disk can be ascertained at the time of the user's request for the distribution of the encryption key. In addition to the basic advantage of being able to purchase information after obtaining an inexpensive disk for the time being and confirming the contents with the non-encrypted part of each software, distribution is more active, Since it can be set arbitrarily, the same number can be set for all owned disks, without having to remember the PIN for each disk,
Since the encryption key transmitted from the software supplier is valid only for that disk, it will not be abused for other disks, and once you register for a disk and a software supplier, If you want to change the PIN, you need to contact the software supplier again.You can change the PIN at any time, and you can add the information you want to use to the disc containing multiple information. In this case, the same password can be used and can be changed, and different passwords can be set for a plurality of pieces of information.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of an encryption key generation method, an optical disk reproduction method, an optical disk reproduction device, and an optical disk reproduction permission method according to the present invention.

FIG. 2 is a flowchart illustrating a process of transmitting information in the optical disc reproducing apparatus of FIG. 1;

FIG. 3 is a flowchart for explaining encryption key generation and transmission processing in the software house of FIG. 1;

FIG. 4 is a flowchart for explaining a process of receiving an encryption key and writing the same on a disc in the optical disc reproducing apparatus of FIG. 1;

FIG. 5 is a diagram showing a reproduction permission and a reproduction
It is a flow chart for explaining an example of prohibition processing.

6 is a diagram showing reproduction permission and permission of the optical disc reproducing apparatus of FIG.
It is a flow chart for explaining other examples of prohibition processing.

FIG. 7 is a diagram schematically showing a conventional software provision mode between a software house and a user.

[Explanation of symbols]

 Reference Signs List 1 optical disk 2 optical disk reproducing device 2a memory 3 soft house

Claims (23)

[Claims] 1. An optical disc on which information is recorded is distinguished from other optical discs by a first area on which optical disc-specific information is optically recorded, information on the optical disc, an arbitrary password, and in addition thereto. Using information specifying at least one of a plurality of information recorded on the optical disc, performing an arithmetic processing by a predetermined algorithm, and optically recording an encryption key generated for reading information from the optical disc. An optical disc, which is an area for additional recording, which has the same format as the recording format of the first area, and has a second area continuous or adjacent to the first area. 2. A step of reading, from the recording medium, information unique to the recording medium that identifies a recording medium on which information is recorded from another recording medium; and a step of reading an arbitrary password set by a user of the recording medium. And performing an arithmetic processing using a predetermined algorithm using the information unique to the recording medium and the password, and generating an encryption key for reading information from the recording medium. 3. A step of reading, from the recording medium, information unique to the recording medium that identifies a recording medium on which information is recorded from another recording medium, and a step of reading an arbitrary password set by a user of the recording medium. Reading information that specifies at least one of a plurality of pieces of information recorded on the recording medium set by the user; and at least one of the information unique to the recording medium, the password, and the plurality of pieces of information. Generating a cryptographic key for reading out information from the recording medium by performing an arithmetic process using a predetermined algorithm using the information specifying the information. 4. A step of reading, from the recording medium, information unique to the recording medium for identifying a recording medium on which information is recorded from another recording medium, and a step of reading an arbitrary password set by a user of the recording medium. Using the information peculiar to the recording medium and the personal identification number to perform an arithmetic process using a predetermined algorithm to generate an encryption key for reading information on the recording medium; A step of appending to an area where the unique information is recorded and an area continuous or adjacent to the area where the unique information is recorded. 5. A step of reading, from the recording medium, information unique to the recording medium for identifying a recording medium on which information is recorded from another recording medium, and a step of reading an arbitrary password set by a user of the recording medium. Reading information that specifies at least one of a plurality of pieces of information recorded on the recording medium set by the user; and at least one of the information unique to the recording medium, the password, and the plurality of pieces of information. Using a specific algorithm to generate an encryption key for reading out the information on the recording medium, and information unique to the recording medium being recorded on the encryption key. A step of appending to an area that is continuous or adjacent to the area. 6. A means for reading, from the recording medium, information unique to the recording medium for identifying a recording medium on which information is recorded from another recording medium, and a means for reading an arbitrary password set by a user of the recording medium Means for transmitting the information unique to the recording medium and the personal identification number to a predetermined encryption key generation device; means for receiving an encryption key from the encryption key generation device; Means for additionally writing in an area in which a is recorded and a continuous or adjacent area. 7. A means for reading, from the recording medium, information unique to the recording medium for identifying a recording medium on which information is recorded from another recording medium, and a means for reading an arbitrary password set by a user of the recording medium. Reading means for reading at least one of a plurality of pieces of information recorded on the recording medium set by the user; at least one of the information unique to the recording medium, the password, and the plurality of pieces of information Means for transmitting information for specifying a predetermined encryption key generation device; means for receiving an encryption key from the encryption key generation device; and a method in which the encryption key is connected to an area where information unique to the recording medium is recorded or Means for additionally writing in an adjacent area. 8. When reproducing information from a recording medium in which information and information for identifying from another recording medium are recorded in advance, the recording medium on which the information is recorded is replaced with another recording medium. Reading out the information unique to the recording medium from the recording medium, and reading an encryption key recorded in an area continuous or adjacent to the area where the information unique to the recording medium is recorded; and Generating a password for reproducing part or all of the information recorded on the recording medium based on the unique information and the encryption key; and recording the password on the recording medium based on the password. Permitting reproduction of part or all of the existing information. 9. When reproducing information from a recording medium in which information and information for identifying it from another recording medium are recorded in advance, the recording medium on which the information is recorded is replaced with another recording medium. Reading out the information unique to the recording medium from the recording medium, and reading an encryption key recorded in an area continuous or adjacent to the area where the information unique to the recording medium is recorded; and A password for reproducing part or all of the information recorded on the recording medium based on unique information, the encryption key, and information specifying at least one of a plurality of pieces of information recorded on the recording medium. An information reproducing method comprising: generating a number; and permitting reproduction of a part or all of the information recorded on the recording medium based on the password. 10. When reproducing information from a recording medium in which information and information for identifying it from another recording medium are recorded in advance by a reproducing apparatus, the recording medium on which the information is recorded is replaced with another recording medium. Reading the information unique to the recording medium from the recording medium, identifying the encryption key recorded in an area continuous with or adjacent to the area where the information unique to the recording medium is recorded; Reading a password, and generating information identifying at least one of a plurality of pieces of information recorded on the recording medium based on the information unique to the recording medium, the encryption key, and the password. A step of permitting a part or all of the information recorded on the recording medium to be reproduced based on the information specifying at least one of the plurality of pieces of information. Steal, with information reproduction method. 11. When a user reproduces information with a reproducing apparatus from a recording medium in which information and information unique to the recording medium for identifying it from another recording medium are recorded in advance, a provider of the recording medium The information reproduction permission method for judging whether or not the reproduction of the information by the user is permitted on the side, wherein the information unique to the recording medium read from the recording medium and the password input by the user Receiving from the playback device side, based on the information unique to the recording medium, the password, or information specifying at least one of a plurality of pieces of information recorded on the optical disc in addition to the above. Generating an encryption key for reproducing part or all of the information recorded on the recording medium, and reproducing part or all of the information recorded on the recording medium. Transmitting the encryption key to the reproducing apparatus side for permission. 12. A reproducing apparatus for reproducing information from a recording medium on which information and information for identifying from another recording medium are recorded in advance, wherein the recording medium on which the information is recorded is replaced with another recording medium. Means for reading, from the recording medium, the information unique to the recording medium identified from: a means for reading an encryption key recorded in an area continuous or adjacent to an area where the information unique to the recording medium is recorded; and Means for generating a password for reproducing part or all of the information recorded on the recording medium based on the unique information and the encryption key; and a means for recording the password on the recording medium based on the password. Means for permitting the reproduction of a part or all of the stored information. 13. A reproducing apparatus for reproducing information from a recording medium on which information and information for identifying from another recording medium are recorded in advance, wherein the recording medium on which the information is recorded is replaced with another recording medium. Means for reading, from the recording medium, the information unique to the recording medium identified from: a means for reading an encryption key recorded in an area continuous or adjacent to an area where the information unique to the recording medium is recorded; and A password for reproducing part or all of the information recorded on the recording medium based on unique information, the encryption key, and information specifying at least one of a plurality of pieces of information recorded on the recording medium. An information reproducing apparatus, comprising: means for generating a number; and means for permitting reproduction of part or all of information recorded on the recording medium based on the password. 14. An optical disc in which information specific to the optical disc is optically recorded, which discriminates an optical disc on which information is recorded from other optical discs, information unique to the optical disc, and an optional password, or in addition to these, An area for magnetically recording an encryption key generated for reading information from the optical disk by performing an arithmetic processing by a predetermined algorithm using information specifying at least one of a plurality of pieces of information recorded on the optical disk; An optical disc having: 15. A step of reading, from the recording medium, information unique to the recording medium that identifies a recording medium on which information is recorded from another recording medium, and a step of reading an arbitrary password set by a user of the recording medium. Using the information peculiar to the recording medium and the personal identification number to perform an arithmetic process using a predetermined algorithm to generate an encryption key for reading information on the recording medium; Recording in a magnetic recording area provided in the storage device. 16. A step of reading, from the recording medium, information unique to the recording medium for identifying a recording medium on which information is recorded from another recording medium, and a step of reading an arbitrary password set by a user of the recording medium. Reading information that specifies at least one of a plurality of pieces of information recorded on the recording medium set by the user; and at least one of the information unique to the recording medium, the password, and the plurality of pieces of information. Using the information to specify, and performing an arithmetic processing by a predetermined algorithm to generate an encryption key for reading the information on the recording medium; and storing the encryption key in a magnetic recording area provided on the recording medium. Recording the encryption key. 17. A means for reading from the recording medium information unique to the recording medium for identifying a recording medium on which information is recorded from another recording medium, and a means for reading an arbitrary password set by a user of the recording medium. Means for transmitting the information unique to the recording medium and the password to a predetermined encryption key generation device; means for receiving an encryption key from the encryption key generation device; and providing the encryption key on the recording medium. Means for recording in a magnetic recording area. 18. A means for reading, from the recording medium, information specific to the recording medium for identifying a recording medium on which information is recorded from another recording medium, and means for reading an arbitrary password set by a user of the recording medium. Reading means for reading at least one of a plurality of pieces of information recorded on the recording medium set by the user; at least one of the information unique to the recording medium, the password, and the plurality of pieces of information Means for transmitting information for specifying the key to the predetermined encryption key generation device; means for receiving the encryption key from the encryption key generation device; and means for recording the encryption key in a magnetic recording area provided on the recording medium. An encryption key recording device comprising: 19. When a reproduction apparatus reproduces information from a recording medium on which information and information for identifying the information from another recording medium are recorded in advance, the recording medium on which the information is recorded is replaced with another recording medium. Reading the information unique to the recording medium from the recording medium, identifying the encryption key recorded in a magnetic recording area provided on the recording medium, and the information unique to the recording medium and the encryption key. Generating a personal identification number for reproducing part or all of the information recorded on the recording medium based on the above, and part or all of the information recorded on the recording medium based on the personal identification number. Allowing reproduction of the information. 20. When reproducing information from a recording medium in which information and information for identifying it from another recording medium are recorded in advance, the recording medium on which the information is recorded is replaced with another recording medium. Reading the information unique to the recording medium from the recording medium, identifying the encryption key recorded in a magnetic recording area provided on the recording medium, and the information unique to the recording medium and the encryption key. And generating a password for reproducing a part or all of the information recorded on the recording medium based on information specifying at least one of the plurality of information recorded on the recording medium, Permitting reproduction of part or all of the information recorded on the recording medium based on the personal identification number. 21. When reproducing information from a recording medium in which information and information for identifying from another recording medium are recorded in advance, the recording medium on which the information is recorded is replaced with another recording medium. Reading information unique to the recording medium from the recording medium, reading an encryption key recorded in a magnetic recording area provided on the recording medium, and reading a password input by a user. Generating information identifying at least one of a plurality of pieces of information recorded on the recording medium based on the information unique to the recording medium, the encryption key, and the password; and at least one of the plurality of pieces of information. Allowing a part or all of the information recorded on the recording medium to be reproduced based on the information specifying one. Law. 22. A reproducing apparatus for reproducing information from a recording medium on which information and information for identifying from another recording medium are recorded in advance, wherein the recording medium on which the information is recorded is replaced with another recording medium. Means for reading, from the recording medium, the information unique to the recording medium identified from: means for reading an encryption key recorded in a magnetic recording area provided on the recording medium; information unique to the recording medium, and the encryption key Means for generating a personal identification number for reproducing part or all of the information recorded on the recording medium based on and part of or all of the information recorded on the recording medium based on the personal identification number Means for permitting reproduction of the information. 23. A reproducing apparatus for reproducing information from a recording medium on which information and information for identifying from another recording medium are recorded in advance, wherein the recording medium on which the information is recorded is replaced with another recording medium. Means for reading, from the recording medium, the information unique to the recording medium identified from: means for reading an encryption key recorded in a magnetic recording area provided on the recording medium; information unique to the recording medium, and the encryption key Means for generating a password for reproducing part or all of the information recorded on the recording medium based on information specifying at least one of the plurality of pieces of information recorded on the recording medium, Means for permitting reproduction of part or all of the information recorded on the recording medium based on the password.