JPH1028115A - Method for reproducing digital information and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To copy and distribute digital information, and to prevent illegal use in the reproducing device of enciphered digital information. SOLUTION: Enciphered digital information is transmitted from a package holder 12 to a management recorder 1, cipher decoding data are generated, the condition and amounts are recorded, and the digital information is reproduced by a package opener 11 by using the cipher decoding data. Thus, the digital information can be copied and distributed, the condition and the amounts can be exactly recorded, and a condition can be exactly obtained. Also, the collection of the charge can be always safely and exactly attained by an electronic settler 2, and the illegal use can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for reproducing digital information having added value, and more particularly to a technique for enabling the digital information to be copied and distributed, and for easily and surely collecting a fee.

[0002]

2. Description of the Related Art Conventionally, audio signals and computer software have been distributed or used for a fee. However, with the advance of digital processing technology, music and movies are not limited to audio signals and computer software. It has become possible to economically transmit, copy, and distribute digital information with various added values, such as text information and programs, that is, information products without distortion. As a result, many problems before digital coding was realized, such as signal distortion and distribution costs associated with transmission and distribution, were solved. However, on the other hand, by solving these problems, intellectual property rights were likely to be infringed because value-added digital information could be easily copied and distributed without any limitation and without deterioration. That is, unauthorized use of digital information without paying for the added value is more likely to occur. Also, it became difficult to know and prevent the damage.

Conventionally, as a means for preventing unauthorized use, for example, there is an unauthorized use prevention mechanism in which software cannot be used unless a key module is attached to a computer.
This example is found in software installed and used on a hard disk in a personal computer. When such software is purchased, a floppy disk corresponding to the key module is attached. Then, when this software is installed on the hard disk and executed, the user is prompted to insert a floppy disk corresponding to the key module. The software is only executed when it is inserted. With such a mechanism, even if the software installed on the hard disk is copied and attempted to be used, it cannot be executed because there is no floppy disk corresponding to the key module.
Therefore, only a valid user who has a floppy disk corresponding to the key module can execute this software.

In addition to this, digital audio SCMS (S
A mechanism for restricting copying, such as erial Copy Management System (EIAJ CPR-2304), has been proposed. Since copying is restricted, illegal copying can be prevented, and illegal use can be prevented. On the other hand, with the legal protection of copyright, there is no mechanical restriction on the digital information playback device, copy distribution is freely permitted, and users only pay when they use it. There is a method of distributing digital information called payware, so-called shareware. The distribution of digital information by shareware has been successful because it enables rapid distribution of goods at low cost. This success indicates that the digital information can be freely copied and transmitted to make the most of its characteristics.

[0005] Further, a method of electronically performing and recording a commercial transaction by applying the encryption technique has been devised. This method is performed as follows. The consumer informs the merchant via the communication network of the merchandise he wants to purchase. Next, the consumer notifies the seller of information necessary for settlement, such as his / her name and credit card number, through the communication network. These are sellers who use the Internet WW
This is possible by opening a homepage on a W (World Wide Web) server and allowing consumers to access and operate the homepage. At the time of notification, if the credit card number is disclosed to a third party, there is a risk that the third party may impersonate the credit card holder. Therefore, the credit card number is encrypted and notified to the seller. The seller makes a payment using the information required for the payment and sends the product to the consumer.

[0006] By using this method, by constructing an appropriate calculation procedure on a computer, it is possible to carry out business transactions safely, as in the case of exchanging prints and castings. Moreover,
Since a commercial transaction can be performed by an operation on a communication device connected to the communication network, the commercial transaction can be easily performed.

[0007]

However, in an unauthorized use prevention mechanism in which software cannot be used unless a key module is attached to a computer, the advantage of digital information that copying and distribution are performed efficiently is lost.
The same applies to digital audio SCMS.

On the other hand, so-called shareware relies on the good intentions of the user. For shareware that uses elements that ensure a formal contract, such as exchanging a formal contract with a service that is almost required when continuing to use such as support or version upgrade, the user will support or upgrade It is not possible to prevent fraudulent use completely, for example, considering the profits of fraudulent use to be greater than the profits gained from it, and continuing to use it without paying.
In addition, it cannot be widely applied to audio signals having no support or version upgrade elements.

Further, when conducting an electronic transaction, it is necessary to communicate with a partner who performs the electronic transaction, and it is complicated to communicate every time digital information is used. Further, there is an inconvenience that digital information cannot be used unless communication is possible. Therefore, the present invention decrypts the encrypted digital information using the decryption data, and records the usage conditions and usage amount of the digital information, thereby making it possible to copy and distribute the digital information. An object is to prevent unauthorized use. In addition, based on the recorded usage conditions and usage, settlement is performed separately from the use of digital information, so that the use and settlement of digital information are independent, and payment is collected securely and securely.
It is an object to enable the use of digital information even when communication is not possible.

[0010]

According to the first aspect of the present invention,
In order to solve the above-mentioned problem, in a digital information reproducing method for decrypting encrypted digital information using decryption data for making the digital information usable, and reproducing the digital information, A use condition acquisition step of acquiring use conditions associated with the use of digital information from the digital information obtained; a decryption data generation step of generating the decryption data based on the digital information; A use recording step of recording a use condition and a use amount of digital information according to the use condition.

According to a second aspect of the present invention, there is provided a digital information reproducing method as set forth in the first aspect, wherein the digital information reproducing method according to the first aspect includes a use condition associated with the use of the digital information and a digital information corresponding to the use condition. And a clearing step for clearing. Claim 3
In order to solve the above-mentioned problem, the invention described in the digital information reproducing method according to claim 1, wherein the encrypted digital information is reproduced and disturbed by a disturbing signal, and the use condition is a use condition encryption. Characterized in that the digital information is encrypted by data, and the digital information disturbed by reproduction is reproduced by using disturbance release data for releasing reproduction disturbance. Using the use condition decryption data for decrypting the use condition encryption, decrypting the code to obtain the use condition, and the decryption data generating step includes generating the decryption data based on the digital information. It is characterized by generating data generation information and generating the decryption data based on the decryption data generation information.

According to a fourth aspect of the present invention, there is provided a digital information reproducing method according to the first aspect, wherein the digital signal is an audio signal. According to a fifth aspect of the present invention, in order to solve the above-mentioned problems, digital information for decrypting encrypted digital information using decryption data for making the digital information usable, and reproducing the digital information In the playback device, from the encrypted digital information, use condition obtaining means for obtaining a use condition accompanying the use of digital information, and decryption data generation means for generating the decryption data based on the digital information, And a use recording means for recording a use condition associated with the use of the digital information and a use amount of the digital information according to the use condition.

According to a sixth aspect of the present invention, there is provided a digital information reproducing apparatus as set forth in the fifth aspect, wherein the digital information reproducing apparatus according to the fifth aspect includes a use condition for using the digital information and a digital information corresponding to the use condition. And a clearing means for clearing the amount. According to a seventh aspect of the present invention, in order to solve the above-mentioned problem, in the digital information reproducing apparatus according to the fifth aspect, the encrypted digital information is reproduced and disturbed by a disturbing signal, and the use condition is limited. Characterized in that the digital information is encrypted by conditionally encrypted data, and wherein the digital information that has been reproduced and disturbed is reproduced using disturbance release data for releasing the reproduction disturbance. Acquisition means decrypts the encryption by use condition decryption data for decrypting the encryption of the use condition, and obtains use conditions, and the decryption data generation means generates the decryption data based on the digital information. Generating decryption data generation information to be decrypted, and generating the decryption data based on the decryption data generation information. To.

According to an eighth aspect of the present invention, there is provided a digital information reproducing apparatus according to the fifth aspect, wherein the digital signal is an audio signal.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 to 12 show a first embodiment of a digital information reproducing apparatus according to the present invention. As shown in FIG. 1, the digital information reproducing apparatus includes a usage management recorder 1, an electronic payment device 2, a package storage device 12, and a package unpacking device 11, and the package stored in the package storage device 12 is opened. It is reproduced by the bale 11.

The package storage device 12 is a device in which digital information to be used is temporarily stored in an encrypted form as a package. As shown in FIG. 2, a package 40 which is an input of the present apparatus includes accompanying information and contents. The accompanying information included in the package 40 includes a package ID, heading information,
It consists of an unpacking key, a payee ID, a price, and a unit of use.

Here, the package ID is an ID assigned to each package without duplication, and the heading information is
Information, such as a song title, which is referred to when a user of the device selects a package is described. The unpacking key is a key for decrypting the encrypted package and outputting a reproduction signal. The payee ID describes the payee who pays for electronic settlement, and the payoff describes the amount of the payout to be recorded in the usage record. The unit of use specifies the unit of use for which consideration should be calculated. The consideration can be specified to be paid for the number of times of use, or can be specified to be paid for the time of use. Here, however, the payment is made for the number of times of use.

The package storage device 12 can store one or a plurality of packages 40 having the configuration shown in FIG. 2 and transfer them to and from other devices without changing the packages 40 by inputting / outputting packages. can do. Also,
Although the package 40 is prevented from being reproduced as it is by a technique such as encryption, processing such as transfer and duplication of the entire package 40 can be performed in the same manner as ordinary digital data. Therefore, package storage 1
2 can be easily realized by an ordinary digital recording device, for example, a hard disk device or a semiconductor storage device.

As shown in FIG. 4, the usage management recorder 1
The unpacking key included in the package 40 is taken out using the primary key, and the recording and management of the use of the package 40 are performed. And records are always consistent. Here, the primary key is for determining whether the accompanying information included in the package is valid, and the primary key may be fixedly provided or may be readable from outside.

The usage management recorder 1 transfers the unpacking key to the package unpacking device 11 according to a user's use request, reproduces the contents of the package 40, and records usage information. The use request includes a package ID,
The usage information is information such as a package ID, a usage unit, a usage amount, and a price, as shown in FIG.

The usage management recorder 1 only needs to generate a signal for controlling other parts of the apparatus by a user's operation.
It can be realized with a simple control procedure. Electronic payment device 2
Uses the usage management recorder 1 to settle the price associated with the use of the device.
According to the control described above, the processing is performed in a safe and reliable manner. The electronic payment method can be realized by a conventional technology such as a bank ATM (automatic teller machine) provided that a payee and a payment amount are given. The specific meaning given to the consideration recorded in the electronic settlement device 2 of the present invention is arbitrary and is a matter to be decided between users of the apparatus. However, the electronic payment unit of the present invention can be made sufficiently secure by the conventional technology.

The package unpacker 11 includes a package 40
And the unpacking key are input, and the reproduced signal is decrypted using the unpacking key. FIG. 7 shows a configuration example of the package unpacking device 11. The separator 33 separates the contents and the accompanying information of the package 40. The decryption circuit 31 decrypts the contents using an unpacking key, and can use a decryption circuit based on a conventional encryption method. The code decoding circuit 32 decodes the encoded data,
An acoustic code decoding circuit or the like based on the O / IEC 11172.3 international standard, commonly known as the MPEG / Audio international standard, or the like can be used.

Next, the operation of each device will be described in detail. This device uses public key encryption technology. Therefore, the function of the public key encryption in the description of the present device will be described. FIG. 8 shows the configuration of the public key encryptor. As shown in FIG. 8, the public key encryptor encrypts the data M by the encryptor 21 and extracts the original data M by the decryptor 22. The encryptor 21
The data M is encrypted with the encryption key K, and the encrypted data m is transmitted or recorded. The decryption unit 22 decrypts the data m using the decryption key k and extracts the original data M. Here, the decryptor 22 cannot reproduce M from m without the decryption key k. Further, even if k and M are present, it is not possible to create m such that M can be obtained by back calculation or decryption of the encryption key K.

When the present apparatus uses this encryption for authentication, k is provided in the apparatus in a reliable manner in advance, and the apparatus is configured to always decode m with k. Therefore, a third party cannot forge m. When the present apparatus uses this encryption for encryption, the apparatus is configured so that data is encrypted and k in the apparatus operates only when it is used properly. As a result, k cannot be used except for legitimate use, so that M cannot be created from m and used.

In the digital signal reproducing apparatus according to the present invention, data is encrypted using the above-described mechanism, and the key is further encrypted with the key, that is, multiple encryption is performed. Therefore, one decryption operation shown in FIG. 8 is represented by a symbol shown in FIG. 9 in order to explain such a multiple decryption procedure. The operation of the package unpacking device 11 will be described first.

The package unpacker 11 unpacks the package 40 as shown in FIG. First, the package 40 as shown in FIG.
Is separated by the separator 33 into accompanying information and contents.
Next, the contents are decrypted by the decryption circuit 31, and the output is converted to a reproduction signal by the codec circuit 32.

FIG. 1 shows the decryption procedure in the first embodiment.
0, shown in FIG. The package 40 is prepared so as to conform to the encryption / decryption procedure. First, the package 40 is selected. The selected package is read into the usage management recorder 1, the encryption is decrypted by the primary key, and after unpacking, the payee ID, the price, and the unit of use are obtained.

Next, the usage information is recorded. As shown in FIG. 6, information to be recorded in the usage record includes a package ID,
The usage ID, usage amount, price, etc. are obtained. The package ID, usage unit, and usage amount are obtained from the usage request shown in FIG.
Based on the package ID included in the use request, the accompanying information of the package 40 shown in FIG.

Next, the unpacking key is decrypted, and the decrypted unpacking key and the package taken out of the package storage 12 are input to the package unpacking unit 11 to open the package as described above. The contents of the package 40 are reproduced by the packing device 11. Next, a process of connecting to a network to perform electronic payment, that is, a processing procedure when the present device is connected to a payment auxiliary device (not shown) via a communication network will be described with reference to FIG.

First, it is determined whether or not the use record recorded in the use management recorder 1 is empty. If the usage record is empty, the process is terminated without doing anything. If the usage record is not empty, one of the recorded usage records is arbitrarily selected, and the settlement processing is performed according to the usage record. The usage record includes the payee and the payment amount, and the other information can be supplemented by the user of the device, so that all information necessary for electronic payment is included. Therefore,
This process is performed by the electronic payment device 2.

Next, when the settlement processing is completed normally, the usage record is deleted. At this time, when the processing is not completed, for example, when the apparatus or the communication line is abnormal, or when the user refuses to complete the processing, the processing is terminated and the processing is interrupted, and the usage record remains as it is. Next, if an unprocessed use record remains, the process returns to the beginning and continues the process.

With the above processing, digital information reproduction and payment processing are performed. Next, a second embodiment of the present apparatus is shown in FIG. The device shown in FIG. 13 removes the package storage device 12 and the package unpacking device 11 from the first embodiment shown in FIG. 1, and connects the device having the same function to the outside instead. Circuit and a package operation input / output circuit 4. Except that these devices are connected to the outside, the configuration and operation are the same as in the first embodiment.

The package used in the device of the second embodiment is the same as the package 40 of the first embodiment. Next, a third embodiment of the present apparatus is shown in FIG. The apparatus shown in FIG. 14 is obtained by adding an unpacking key generator 3 and an interference canceller 5 to the apparatus of the second embodiment shown in FIG. 13 in order to make unauthorized use more difficult. .

Package 4 Used in Apparatus of Third Embodiment
No. 1 added a decryption key, a primary key ID, a signature, and a release key to the configuration shown in FIGS. 15 and 16, that is, the package 40 shown in FIGS. 2 and 3, and changed the unpacking key to an unpacking mother key. Things. Here, the decryption key is for decrypting the accompanying information in a decryption procedure described later, and the primary key ID is for identifying the primary key for decrypting the decryption key. The release key operates the interference release unit 5 to release the interference signal (scramble), and the unpacking mother key is a master key for generating the unpacking key. The package is prepared to be usable by unpacking and jamming.

In the third embodiment, the use management recorder 1 stores a plurality of primary keys as shown in FIG. 17 in order to enhance security against unauthorized use. As already mentioned,
The primary key is for decrypting the decryption key and is identified by the primary key ID. Also, a new primary key can be set in the device, and an old primary key can be exchanged for a new one. Below, the third
Details of the operation of the apparatus of the embodiment will be described with reference to FIG.

First, in response to a use request, a primary key ID and a decryption key are sent from the external package storage to the use management recorder 1 via the package operation input / output circuit 4. The usage management recorder 1 recognizes the primary key from the primary key ID, and decrypts the decryption key using the primary key. Next, using the decrypted decryption key, the accompanying information of the package is decrypted, the unpacking mother key and the release key are obtained, and the usage information is recorded.

Next, the unpacking mother key is input to the unpacking key generator 3. The unpacking key generator 3 generates an unpacking key from the unpacking mother key. Next, using the unpacking key, the contents are taken out of the package, sent to the jam canceller 5, and the jamming signal is removed from the contents using the cancel key to reproduce the contents. In the third embodiment, it is assumed that the unpacking key generated by the unpacking key generator is generated continuously, for example, as shown in FIG. The use of such an unpacking key can make it difficult to illegally record and duplicate the unpacking key.

Next, the prevention of unauthorized use of a package by the present apparatus will be described for several cases of unauthorized use. First, we show that package tampering is not easy. The accompanying information of the package is encrypted so that it can be decrypted with the primary key or the decryption key. This encryption is performed by public key cryptography. However, in public key cryptography, even if the primary key and the decryption key are known, it is not easy to perform encryption. Therefore, it is not easy to forge additional information that can be decrypted with the primary key or the decryption key.

The contents of the package cannot be used without the unpacking key shown in FIGS. 1, 13 and 14.
The unpacking key is encrypted and included in the accompanying information (unpacking mother key in FIG. 16) shown in FIGS. Therefore, as described above, it is not easy to forge the accompanying information, so that the unpacking key and other accompanying information cannot be individually tampered. Therefore, the package can be used only together with the legitimate accompanying information.

Next, it will be shown that even if the encryption key corresponding to the decryption key or the encryption key corresponding to the primary key is leaked, unauthorized use can be limited or eliminated. If the secret of the encryption key that can be decrypted with the primary key is broken, it becomes possible to use this key to modify a legitimate package into a package that can be used illegally. However, in the present apparatus, since the decryption key can be changed for each package, even if one encryption key is obtained illegally, only one limited package can be falsified. Also, if the encryption key corresponding to the primary key is known, all packages will be used illegally, but by exchanging the primary key, the security of the package corresponding to the new primary key will be maintained . By periodically changing the primary key, the risk of unauthorized use of many packages at once can be reduced.

Next, an analysis of the device shows that the device is legally protected from the act of legitimately manufacturing a device that illegally uses the package. To play the package,
A primary key built into the device is essential. Therefore, it is necessary and sufficient to prevent others from using this primary key for unauthorized purposes. The acquisition and unauthorized use of the primary key can be subject to various property rights protection. Also, since the device itself with the built-in primary key does not need to be traded frequently, the user can be bound by a use contract when exchanging the device. Therefore, the primary key can be legally protected in a double or triple manner.

Next, it will be described that it is difficult to perform unauthorized use due to a modification of the apparatus. In the part of the apparatus other than the package storage device and the package unpacking device, the processing content is a simple sequential circuit, and can be stored in one small integrated circuit. Since this integrated circuit is a sufficiently small component, it can have a structure that is difficult to be illegally processed or disassembled. Also, disassembly and analysis can be prohibited by contract. Thus, the central part of the device can be strongly protected both structurally and contractually, because it can be made as a small semiconductor component.

Next, it will be described that it is difficult to illegally use the package without disassembling the usage management recorder and the unpacking key generator. The package container and the package unpacker in the device are relatively complex parts and are difficult to integrate with other parts. Thus, these parts are at risk of being separated from the device, analyzed, modified and reconstructed. In such a case, the package can be unpacked by recording the unpacking key given to the package unpacking device and giving the modified package unpacking device the same unpacking key.

However, since the unpacking key given to the package unpacker differs from one package to another, the only package that can be used by this method is one package whose unpacking key has been checked. If you only use one package illegally,
Since it is sufficient to re-record the signal reproduced by the ordinary digital recording device, such an unauthorized use is not a new weak point of the device. Also, the unpacking key can be larger than the package or the reproduced sound signal.
In such a case, the necessity of storing the unpacking key together with the package is also an obstacle to unauthorized use.

Next, it will be shown that the use record is erased by discarding the apparatus, and the use fee cannot be illegally reduced. The device connects to the network on a regular basis,
Payment is not performed during the period from when the device is once connected to the network until the next connection. However, in the meantime, the device may only be able to use a certain amount of usage. If it is assumed that the price corresponding to the used amount is collected as a reservation price when the device is destroyed, even if extra cost is paid by destroying the device, the price cannot be reduced.

[0046]

According to the first aspect of the present invention, since the encryption of the encrypted digital information that can be duplicated is decrypted together with the recording of the usage conditions and the usage amount, the digital information can be freely copied and reproduced.
While it is possible to distribute the digital information, it is possible to reliably record the usage conditions and usage amount of the digital information. Therefore, unauthorized use of digital information can be prevented.

Further, since the content of the processing can be simplified, it can be accommodated in one small integrated circuit. Therefore, the device according to the present invention can be made small enough to make unauthorized processing and disassembly difficult, and it becomes difficult to use digital information illegally by modifying the device. According to the second aspect of the present invention, since the settlement can be made based on the use condition and the usage amount of the digital information recorded with certainty, the person who should be compensated for the use of the digital information can collect the compensation without fail, Unauthorized use of information is prevented.

According to the third aspect of the present invention, the code can be decrypted when the use condition is obtained, so that the use condition can be encrypted, and it is difficult to forge the use condition. . Therefore, it is possible to prevent unauthorized use by forging the use conditions. In addition, since the decrypted data is generated and replaced, even if the decrypted data is stolen, the decrypted data cannot immediately be used to decrypt the digital information. Therefore, unauthorized use due to leakage of the decrypted data can be prevented. Furthermore, since the interfering signal can be released at the time of reproducing the digital information, the interfering signal can be applied to the digital information, and in addition to the encryption, the fraud by the interfering signal can be prevented.

According to the fourth aspect of the present invention, even in the case of an audio signal that does not need to be supported or upgraded,
The payment can be settled, preventing fraudulent use that could not be solved with shareware. Encoding and decoding of an audio signal can be performed based on a system which has become an international standard such as ISO / IEC IS 11172-3 (commonly known as MPEG audio). Therefore, the digital information can be easily encoded and decoded by limiting the digital information to the acoustic signal.

According to the fifth aspect of the present invention, since the encryption of the encrypted digital information which can be copied is decrypted together with the recording of the use condition and the usage amount, the digital information can be freely copied and distributed. Also, it is possible to reliably record the usage conditions and usage amount of digital information. Therefore, unauthorized use of digital information can be prevented. Further, since the content of the processing can be simplified, it can be stored in one small integrated circuit. Therefore, the device according to the present invention can be made small enough to make unauthorized processing and disassembly difficult, and it becomes difficult to use digital information illegally by modifying the device.

According to the sixth aspect of the present invention, since the settlement can be made based on the use conditions and the usage amount of the digital information recorded reliably, the person who should be paid for the use of the digital information surely collects the payment. And prevent unauthorized use of digital information. According to the invention described in claim 7, since the encryption can be decrypted when the use condition is acquired,
The use conditions can be encrypted, making it difficult to forge the use conditions. Therefore, it is possible to prevent unauthorized use by forging the use conditions. In addition, since the decrypted data is generated and replaced, even if the decrypted data is stolen, the decrypted data cannot immediately be used to decrypt the digital information. Therefore, unauthorized use due to leakage of the decrypted data can be prevented. Furthermore, since the interfering signal can be released at the time of reproducing the digital information, the interfering signal can be applied to the digital information, and in addition to the encryption, the fraud by the interfering signal can be prevented.

According to the eighth aspect of the present invention, even in the case of an audio signal that does not need to be supported or upgraded,
The payment can be settled, preventing fraudulent use that could not be solved with shareware. Encoding and decoding of an audio signal can be performed based on a system which has become an international standard such as ISO / IEC IS 11172-3 (commonly known as MPEG audio). Therefore, the digital information can be easily encoded and decoded by limiting the digital information to the acoustic signal.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a digital information reproducing apparatus according to the present invention.

FIG. 2 is a diagram illustrating a package according to a first embodiment.

FIG. 3 is a diagram showing accompanying information of the package shown in FIG. 2;

FIG. 4 is a conceptual diagram of the usage management recorder shown in FIG.

FIG. 5 is a diagram showing a configuration of a use request according to the first embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of a usage record according to the first embodiment of the present invention.

FIG. 7 is a view for explaining a processing procedure of the package unpacking device shown in FIG. 1;

FIG. 8 is a diagram illustrating a public key cryptosystem.

FIG. 9 is a diagram in which the public key cryptosystem shown in FIG. 8 is symbolized.

FIG. 10 is a diagram illustrating a control procedure when using a package.

FIG. 11 is a diagram illustrating a decryption processing procedure.

FIG. 12 is a diagram illustrating a processing procedure when connecting to a network.

FIG. 13 is a diagram showing a second embodiment of the digital information reproducing apparatus according to the present invention.

FIG. 14 is a diagram showing a digital information reproducing apparatus according to a third embodiment of the present invention.

FIG. 15 is a diagram showing a package according to a third embodiment.

16 is a diagram showing accompanying information of the package shown in FIG.

17 is a conceptual diagram of the usage management recorder shown in FIG.

FIG. 18 is a diagram for explaining a decryption processing procedure.

FIG. 19 is a diagram illustrating a processing procedure for generating a plurality of unpacking keys.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 usage management recorder 2 electronic payment device 3 unpacking key generator 4 package operation input / output circuit 5 jammer release device 11 package unpacking device 12 package storage device 21 encryption device 22 decryption device 23 key generator 31 encryption decryption circuit 32 Code decoding circuit 33 Separator 40, 41 Package

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical indication location G06F 17/60 7259-5J G09C 1/00 660B G09C 1/00 660 G06F 15/21 Z 330

Claims (8)

[Claims] 1. A digital information reproducing method for decrypting encrypted digital information by using decryption data for making the digital information usable, and reproducing the digital information, comprising: A use condition acquisition step of acquiring use conditions associated with use of digital information from information; a decryption data generation step of generating the decryption data based on the digital information; and a use condition associated with use of the digital information. And a use recording step of recording a use amount of digital information according to the use condition. A digital information reproducing method, comprising: 2. The digital information reproducing method according to claim 1, further comprising: a clearing step of clearing a use condition associated with the use of the digital information and a usage amount of the digital information according to the use condition. A digital information reproducing method. 3. The digital information reproducing method according to claim 1, wherein the encrypted digital information is reproduced and disturbed by a disturbance signal, and the use condition is encrypted by use condition encrypted data. Wherein the digital information disturbed by reproduction is reproduced using disturbance release data for releasing reproduction disturbance, comprising: a disturbance release step for reproducing; and the use condition obtaining step includes encrypting the use condition. Using the use condition decryption data to decrypt, obtain the use condition by decrypting the cipher, the decryption data generating step, based on the digital information, generate decryption data generation information to generate the decryption data, A digital information reproducing method, wherein the decryption data is generated based on the decryption data generation information. 4. The digital information reproducing method according to claim 1, wherein said digital signal is an audio signal. 5. A digital information reproducing apparatus which decrypts encrypted digital information by using decryption data for making the digital information usable, and reproduces the digital information. Use condition acquisition means for acquiring use conditions associated with use of digital information from information; decryption data generation means for generating the decryption data based on the digital information; use conditions associated with use of the digital information And a use recording means for recording the amount of use of digital information according to the use condition. 6. The digital information reproducing apparatus according to claim 5, further comprising: a clearing means for clearing a use condition accompanying the use of the digital information and a use amount of the digital information according to the use condition. A digital information reproducing apparatus, characterized in that: 7. The digital information reproducing apparatus according to claim 5, wherein the encrypted digital information is reproduced and disturbed by a disturbance signal, and the use condition is encrypted by use condition encrypted data. Wherein the digital information disturbed by reproduction is reproduced by using disturbance release data for releasing reproduction disturbance, and a disturbance release unit for reproducing the digital information. Using the use condition decryption data to decrypt, the decryption data to obtain the use condition, the decryption data generating means, based on the digital information, to generate the decryption data generation information to generate the decryption data, A digital information reproducing apparatus for generating the decryption data based on the decryption data generation information. 8. The digital information reproducing apparatus according to claim 5, wherein said digital signal is an audio signal.