JPH09307545A - Book data reproduction method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow the method to collect proper compensation by prevention a theft of a key to used decode ciphered book data due to illegal intrusion and illegal reproduction of the book data expected as a result. SOLUTION: The device is provided with a communication section 4 that acquires the same deciphering key as that used for serving the book data through the approval of use by means of wired or radio communication or the like. A separate section 3 separates a data identifier 12 and an information main body 3 included in the ciphered book data entered by an entry section 2, a transmission section 6 sends the data identifier 12 to an information service agency, a reception section 7 receives a deciphering key sent from the information service agency, a communication decoding section 8 decides the key, a decoding section 9 decodes the information main body 13 by using the key and a reproduction section 10 reproduces the information main body 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible to protect a copyrighted work from unauthorized use and to collect an appropriate copyright consideration when digitizing and distributing copyrighted work data. The present invention relates to a copyrighted material data reproducing method and an apparatus thereof.

[0002]

2. Description of the Related Art In recent years, along with the development of digital information compression technology and digital communication technology, digitalization of copyrighted works such as video, music and documents has progressed, and these are distributed not only through information recording media but also through broadcasting and communication. The number of cases is increasing. In the distribution of such digitized copyrighted work data, it is important to protect the copyright by preventing unauthorized reproduction and copying of the copyrighted work. Recently, copyrighted works having such a function Data reproducing devices have come into use. As such a copyrighted-material data reproducing apparatus, for example, a configuration described in Japanese Patent Laid-Open No. 7-131452 as "Digital information protection method and processing apparatus thereof" is known.

A conventional copyrighted-material data reproducing apparatus will be described below with reference to FIG. FIG. 18 shows a functional block configuration of a conventional copyrighted material data reproducing apparatus.
In FIG. 18, 101 is a copyrighted-material data reproducing device, 10
2 is an input unit for inputting encrypted work data, 10
Reference numeral 3 is a common key storage unit in which a common key for decrypting encrypted work data is stored in advance, 104 is a decryption unit for decrypting encrypted work data using the common key, and 105 is a work This is a playback unit that plays back the object data in a state in which it can be sensed by the human sense of sight or touch.

The operation of the copyrighted-material data reproducing apparatus 101 configured as described above will be described below.
First, the input data encrypted from the communication channel is input section 1
02 and is sent to the decoding unit 104. On the other hand, the common key stored in advance is read from the common key storage unit 103 and supplied to the decryption unit 104. Decoding unit 10
At 4, the encrypted common copyrighted-material data is checked and decrypted using the supplied common key. The decrypted copyrighted-material data is sent to the reproduction unit 105, reproduced by the reproduction unit 105 in a state in which it can be sensed by human visual sense, tactile sense, or the like, and output.

[0005]

However, in the above-mentioned conventional configuration, the same value is fixedly used as the common key for decrypting / decoding the encrypted copyrighted-material data, and the copyrighted-material data reproducing apparatus is used. Since the common key is always stored inside, there is a possibility that the common key may be stolen along with the encrypted copyrighted work data by unauthorized intrusion by a hacker or the like from the outside via a communication path or the like. Therefore, if the key and the data are stolen, they can be illegally reproduced by another device of the same type, so that there is a problem that the copyright is infringed.

The present invention solves the above-mentioned problems of the prior art. The key for decrypting / decoding encrypted copyrighted-material data is stolen due to unauthorized intrusion, and the copyrighted copyrighted-material data expected as a result is illegal. It is an object of the present invention to provide a copyrighted-material data reproducing method and device which can prevent proper reproduction and can collect an appropriate price when reproducing the copyrighted-material data.

[0007]

In order to achieve the above-mentioned object, the present invention obtains a decryption key by obtaining a use approval of an encrypted copyrighted work data from an information provider through wired or wireless communication. The copyrighted material data is decrypted and reproduced using this. This makes it possible to prevent theft of a key for deciphering / decoding encrypted copyrighted work data due to unauthorized intrusion, and the resulting unauthorized reproduction of copyrighted work data. Appropriate consideration can be collected for reproduction.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is
Characterized by decrypting encrypted copyrighted data input from a communication channel or information recording medium using a decryption key obtained by obtaining approval from an information provider through wired or wireless communication. This is a method for reproducing copyrighted data and does not store the decryption key inside, so it is possible to prevent theft of the decryption key due to unauthorized intrusion from the outside and the expected unauthorized reproduction of copyrighted data. In addition, since it is necessary to approve the use of the copyrighted material data each time it is reproduced, there is an effect that it is possible to perform appropriate charging according to the number of times of viewing by reproduction and other management.

According to a second aspect of the present invention, there is provided input means for inputting, from a communication channel or an information recording medium, literary work data consisting of a data identifier and an information body encrypted with a different key each time, and the input. The separating means for separating the copyrighted material data input from the means into the data identifier and the encrypted information body, and the data identifier obtained by the separating means for requesting approval of the use of the copyrighted material data. Send to the provider and obtain the encryption decryption key used for the copyrighted work data as a permission response. Communication means using wired or wireless communication, and the encryption decryption key obtained by the communication means to perform the separation. Decryption means for decrypting the encrypted information body obtained by the means, and a sense of the decrypted information body obtained by the decryption means by a human visual sense or tactile sense. It is a copyrighted material data reproducing device equipped with a reproducing means for reproducing in a state where it can be reproduced.Because it is acquired in an encrypted state without storing the decryption key inside, it is possible to prevent unauthorized intrusion from outside and eavesdropping on the communication path. It is possible to prevent the decryption key from being stolen, and even if the communication decryption key is stolen, the copyrighted material data cannot be reproduced without the decryption key. Therefore, it is possible to prevent unauthorized reproduction. Since the use approval is required each time, there is an effect that it is possible to perform appropriate billing according to the number of times of viewing by reproduction and other management.

According to the third aspect of the invention, the input means communicates the copyrighted material data consisting of the identifier of the data, the condition information, and the information body encrypted with the different key only when the condition information is specific. Input by a channel or an information recording medium, and the separating means separates the copyrighted-material data input from the input means into a data identifier, condition information, and an information body, and is obtained by the separating means. If the result of the determination obtained by the determining means does not require approval, the communication means and the decrypting means are prevented from operating, and the separation is performed. The copyrighted material data reproducing apparatus according to claim 2, wherein the information body obtained by the means is directly decrypted and supplied to the reproducing means. In addition to the operation of the invention according to claim 2, And standing city data, it is circulated in the same path and copyrighted data encrypted present copyright, has the effect of making it possible to reproduce the same apparatus.

According to another aspect of the invention, the communication means sends the data identifier to the information provider via the communication path together with the user identification information registered in advance, and the information provider via the communication path. From the receiving unit for receiving the encrypted decryption key used for the copyrighted work data from, and the encrypted decryption key obtained by the receiving means,
The copyrighted-material data reproducing apparatus according to claim 2 or 3, further comprising a communication decryption unit for decrypting using a communication decryption key held therein, wherein in addition to the function of the invention according to claim 2 or 3, encryption is provided. The security of the decryption key can be increased.

According to a fifth aspect of the present invention, the transmitting section sends the pre-registered authentication information to the information provider together with the data identifier and the user identification information when requesting the approval of the use of the literary work data. According to another aspect of the present invention, there is provided the copyrighted-material data reproducing apparatus, wherein in addition to the function of the invention of claim 4, the user is allowed to input authentication information such as a password or a personal identification number registered in advance. It has an effect that it is possible to prevent unauthorized use by using the user identification information, that is, illegal use by misrepresentation and stealing of the decryption key by misrepresentation without limiting the content of the user identification information. .

The invention according to claim 6 is the copyrighted-material data reproducing apparatus according to claim 4, in which the transmitting section and the receiving section select and use a plurality of communication paths, and the invention according to claim 4 In addition to the function of the above, a different communication path can be used every time, so it is possible to make it difficult for an encrypted decryption key to be eavesdropped, and it is possible to prevent illegal reproduction more effectively, Since it is possible to avoid congestion and troubles by monitoring, there is an effect that it is possible to prevent the reproduction from being delayed due to these factors.

According to a seventh aspect of the present invention, the communication decryption unit decrypts the encrypted decryption key using the communication decryption key that is switched synchronously between the user side and the information provider side. A copyrighted material data reproducing apparatus according to item 4,
In addition to the function of the invention described in claim 4, since the communication decryption key is unique to each user and is switched at each communication or at a specific timing, the decryption key encrypted by unauthorized intrusion, wiretapping, spoofing, or a combination thereof is used. It has an effect that it is possible to very effectively prevent stealing and illegal reproduction.

The invention according to claim 8 is the copyrighted-material data reproducing apparatus according to any one of claims 2 to 7, further comprising means for outputting input data to a communication channel or an information recording medium. In addition to the functions of the inventions described in 2 to 7, since it is necessary to approve the use of the copyrighted data each time it is reproduced, the copyright can be protected, while the copyrighted data is copied between devices of the same type. As a result, it is possible to promote the free circulation of information.

According to a ninth aspect of the present invention, a unique encryption means for encrypting input data with a unique encryption key, and a storage means for storing the input data uniquely encrypted by the encryption means, 8. The copyrighted-material data reproducing device according to claim 2, further comprising: a unique decryption unit that decrypts the unique encrypted data accumulated by the accumulation unit and supplies the decrypted unit to the separating unit. In addition to the function of the invention described in 7, the work data can be stored while protecting the work data from unauthorized intrusion.

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a functional block diagram showing the structure of a copyrighted-material data reproducing apparatus according to a first embodiment of the invention, which corresponds to claims 1, 2, and 4 of the invention.
In FIG. 1, reference numeral 1 is a copyrighted-material reproduction apparatus, 2 is an input unit for inputting encrypted copyrighted-material data, and is a receiving apparatus for wired communication, wireless communication, broadcasting or the like, or an information recording medium such as a video tape or a compact disc. Readers can be used. Reference numeral 3 denotes a separation unit that separates the encrypted copyrighted-material data into a data identifier and an encrypted information body, and a demultiplexer or the like can be used. Reference numeral 4 denotes a communication unit, a transmission unit 6 for transmitting an identifier of data together with user identification information registered in advance to an information provider (in this embodiment, an information provider) via a communication channel 5, and a communication channel. The encryption is performed by using the receiving unit 7 which receives the encrypted decryption key used for the copyrighted work data from the information provider via 5 and the unique communication decryption key held in each device. And a communication decryption unit 8 for decrypting the encrypted decryption key. In addition to a wired communication transceiver such as an ISDN terminal or a wireless communication transceiver such as a PHS terminal, a network interface device such as a LAN card can be used for the transmission unit 6 and the reception unit 7. As the communication decryption unit 8, a memory holding a communication decryption key and an arithmetic circuit incorporating a communication decryption algorithm can be used. A decryption unit 9 decrypts the information body encrypted by using the decryption key, which can be used by an arithmetic circuit incorporating a decryption algorithm. A reproducing unit 10 reproduces the decrypted copyrighted material data in a state in which it can be sensed by human's audiovisual sense or tactile sense. In addition to a display device such as a display monitor and a printing device such as a printer, a performance device, a voice output device, Braille printers can also be used. The separation unit 3, the decoding unit 9, and the communication decoding unit 8 are
It may be realized by using a computer program on a microcomputer or a general-purpose computer.

The operation of the copyrighted-material data reproducing apparatus 1 configured as described above will be described below with reference to FIG. First, input data from a communication channel or the like is encrypted with a different key each time and input to the input unit 2 (ST
1). The input unit 2 sends the input data to the separating unit 3 as encrypted copyrighted-material data 11. Here, an example of the format of the encrypted copyrighted-material data 11 is shown in FIG. The encrypted copyrighted-material data 11 has a data identifier i.
12 and the information body 13 (K which is encrypted using the decryption key Ki uniquely determined for the data identifier 12).
i [indicated by the information body]). The data identifier i and the decryption key Ki are managed by the information provider, and their corresponding relationship is not known to the user. The data identifier 12 does not identify the content of the information body 13 but identifies the decryption key Ki used. Therefore, even if the contents of the information body 13 are the same,
In general, different data identifiers can be used.

In the separating unit 3, the encrypted copyrighted-material data 11 is separated into a data identifier 12 and an encrypted information body 13 (ST2), each of which is transmitted to the transmitting unit 6 of the communication unit 4, It is sent to the decryption unit 9. In the transmission unit 6, the data identifier 12 is combined with the user identification information, which is determined and registered at the time of contract with the information provider and held in the apparatus, as the usage approval request data 14, and the information is provided via the communication path 5. Send to the trader (ST3). On the other hand, the information provider side confirms the user and the data and sends an answer to the user (ST4). When the answer approves and permits the use (ST5), the use permission reply data 18 is sent to the receiving unit 7 via the communication path 5.

An example of the format of the usage approval request data 14 is shown in FIG. 3 (b). Usage approval request data 14
Includes a header 15, a data identifier i16, and user identification information 17. In the unlikely event that an illegal intrusion occurs and the user identification information inside the device is stolen, the user identification information is used so that another person cannot impersonate the user of this device by using the same type of device and perform unauthorized reproduction. As 17 it is preferable to use, for example, the address itself on the network used by the transmitter 6 and the receiver 7. Alternatively, the user identification information 17 is not particularly limited, and the usage permission reply data 18 may be transferred by a callback from an information provider or the like. Although the data identifier 16 and the user identification information 17 are not encrypted here, it is preferable to encrypt them in order to protect privacy from wiretapping.

Next, an example of the format of the usage permission reply data 18 is shown in FIG. Usage permission answer data 18
Includes a header 19 and a decryption key 20 (indicated by Kr [Ki]) encrypted using the communication decryption key Kr. The communication decryption key Kr is a value unique to the device, which is determined and registered at the time of contract with the information provider, written in the device, and unknown to the user.

When receiving the use permission reply data 18, the receiving unit 7 takes out the encrypted decryption key 20 contained therein and sends it to the communication decrypting unit 8 (ST.
6). In the communication decryption unit 8, the encrypted decryption key 2
0 is decrypted using the communication decryption key Kr, and the decryption key is obtained and supplied to the decryption unit 9 (ST7). The decryption unit 9 decrypts the encrypted information body 13 using the decryption key, and sends the decrypted copyrighted work data to the reproduction unit 10 (ST8). The decrypted copyrighted-material data is reproduced by the reproducing unit 10 in a state in which it can be sensed by human hearing or touch, and is output (ST9). If the usage permission reply data 18 cannot be received, the process is terminated without decryption / reproduction (ST10).

As described above, according to the first embodiment, since the decryption key is not stored in the inside but is obtained in the encrypted state, the decryption key is obtained by unauthorized intrusion from the outside and wiretapping of the communication path. Theft can be prevented, and even if the communication decryption key is stolen, it is impossible to reproduce the copyrighted data without the decryption key, so it is possible to prevent unauthorized reproduction. In addition, it can be used every time the copyrighted data is reproduced. Approval is required, so appropriate billing according to the number of views by playback,
It is also possible to perform other management.

(Embodiment 2) FIG. 4 shows claim 3 of the present invention.
7 is a functional block diagram showing a configuration of a copyrighted-material data reproducing device 21 according to Embodiment 2 corresponding to 4 and 4. FIG. FIG.
1 is different from FIG. 1 in that the separation unit 3A separates the encrypted copyrighted-material data 31 into a data identifier 32, condition information 33, and an encrypted information body 34. The point is that the determination unit 22 that determines whether or not the usage approval of the object data is necessary is provided, and the operations of the communication unit 4A and the decoding unit 9A are controlled based on the determination result. The determination unit 22 can be used in combination with logic circuits. Alternatively, it may be realized by using a computer program on a microcomputer or a general-purpose computer.

The operation of the copyrighted-material data reproducing apparatus 21 having the above-described structure will be described below with reference to FIG. First, input data from a communication channel or the like is encrypted with a different key each time and input to the input unit 2 (ST1
1). The input unit 2 sends the input data to the separating unit 3A as encrypted copyrighted-material data 31.

FIG. 6 shows an example of the format of the encrypted copyrighted work data 31 according to the second embodiment.
The encrypted copyrighted-material data 31 has a data identifier i32.
And condition information 33, and an information body 34 (indicated by Ki [information body]) encrypted using a decryption key Ki uniquely determined for the data identifier 32. The data identifier i and the decryption key Ki are managed by the information provider, and their corresponding relationship is not known to the user. The data identifier 32 does not identify the content of the information body 34, but identifies the decryption key Ki used. Therefore, even if the contents of the information body 34 are the same, generally different data identifiers can be used. The condition information 33 is a bit string in which the use condition of the copyrighted-material data is subdivided and is expressed as a bit string. The bit 35 indicates that the copyrighted material is not copyrighted, the bit 36 indicates that the copyright is abandoned, and the copyright. It is composed of a bit 37 and the like indicating that it is protected. In this example, the use approval is determined to be necessary when the bit 37 is set, and the use approval is determined to be unnecessary when the bit 35 or 36 is set.

In the separating unit 3A, the encrypted copyrighted-material data 31 is used as a data identifier 32 and condition information 33.
And the encrypted information body 34 (ST1
2), the transmission unit 6 of the communication unit 4A and the determination unit 22
To the decryption unit 9A. In the determination unit 22, the condition information 3
As described above, whether or not the use approval is necessary is determined based on 3 (S
T13), and sends the determination result to the communication unit 4A and the decoding unit 9A. In the communication unit 4A and the decoding unit 9A, when the determination result indicates that the use approval is required, the same operation as in the first embodiment is performed (ST14 to 22). If the determination result indicates that the use approval is not required, the operation of the communication unit 4A is suppressed, and the decryption unit 9A reproduces the input supplied as the encrypted information body 34 as the decrypted copyrighted work data. Send to 10. The operation of the reproducing unit 10 is the same as in the case of the first embodiment regardless of the determination result, and the decoded copyrighted-material data is reproduced and output in a state that can be sensed by human hearing or touch.

As described above, according to the second embodiment, in addition to the effects of the first embodiment, the data without copyright and the encrypted copyrighted work data with copyright are provided on the same route. It is possible to circulate it in the same device and reproduce it with the same device.

(Embodiment 3) FIG. 7 shows claim 5 of the present invention.
11 is a functional block diagram showing the configuration of a copyrighted-material data reproducing device 41 in the third embodiment corresponding to FIG. 7 is different from FIG. 1 in that the communication unit 4B is provided with an authentication input unit 42 for inputting pre-registered authentication information, and the transmission unit 6A uses the authentication information as a data identifier and a pre-registered user identification. The point is that the information is sent to the information provider via the communication path 5. An input device such as a keyboard, a touch panel, or a mouse may be used as the authentication input unit 42, and an IC card and I
It may be used in combination with a C card reader.

The operation of the copyrighted-material data reproducing apparatus 41 configured as described above will be described below with reference to FIG. The third embodiment differs from the first embodiment only in the operations of the authentication input unit 42 and the transmission unit 6A. That is, ST31, 32 and ST36
2 to ST4 are the same as ST1 and 2 and ST4 to 10 in FIG. 2 except that the authentication input unit 42 receives the authentication information 51 such as a password or a personal identification number registered in advance from the user. (ST33), this is encrypted to prevent eavesdropping (ST34), and it is sent as encrypted authentication information 52 to the transmission unit 6A. At the transmission unit 6A, the data identifier 12 and the information determined by the contract with the information provider are determined. The user approval information registered and held in the device and the encrypted authentication information 52 are collectively used as a usage approval request data 53.
And send it to the information provider via the communication path 5 (ST
35) point.

Here, a format example of the usage approval request data 53 is shown in FIG. The usage approval request data 53 includes a header 54, a data identifier i55, and user identification information 5
6 and the authentication information 57 (indicated by Ks [authentication information]) encrypted with the encryption key Ks for transmission. Authentication information 5
By confirming 2 on the information provider side, it is possible to prevent another person from impersonating the user of this apparatus and performing unauthorized reproduction. Therefore, an address on the network may be used as the user identification information 56, or the information from the information provider may be used. It is not necessary to use a callback or the like, and it can be applied to a portable device used without fixing the address on the network. Although the data identifier 55 and the user identification information 56 are not encrypted here, it is preferable to encrypt them also in order to protect privacy from wiretapping. Alternatively, conversely, the encryption of the authentication information 52 output from the authentication input unit 42 may be omitted, and a wiretapping prevention measure may be applied to the communication path 5 instead.

As described above, according to the third embodiment, in addition to the effects of the first embodiment, by allowing the user to input authentication information such as a password and a personal identification number registered in advance, it is possible to identify the user of another person. It is possible to prevent unauthorized use by using information, that is, fraudulent use by misrepresentation and stealing of the decryption key by misrepresentation without limiting the content of the user identification information.

(Fourth Embodiment) FIG. 10 is a functional block diagram showing the structure of a copyrighted-material data reproducing apparatus 61 according to a fourth embodiment of the present invention. 10 is different from FIG. 1 in that the communication unit 4C has a plurality of communication paths 5
A selecting unit 62 for selecting and using A and 5B is provided, and in the transmitting unit 6 and the receiving unit 7, the communication paths 5A and 5 are connected via the selecting unit 62.
This is the point where B and B are selected. For the communication paths 5A and 5B, different lines of the same type of network can be used, or completely different types of network lines such as wired communication and wireless communication can be used. However, in the latter case, it is necessary for the selecting unit 62 to have the lower layer function of communication, not the transmitting unit 6 and the receiving unit 7.

The operation of the copyrighted-material data reproducing apparatus 61 configured as described above will be described below with reference to FIG. The difference between the fourth embodiment and the first embodiment is that the transmitting unit 6, the receiving unit 7, and the selecting unit 62.
It is only the operation of. That is, ST51, 52 and ST5
4 to 61 are the same as ST1 and 2 and ST3 to 10 in FIG. 2, only ST53 is different, and the transmission unit 6 does not send the usage approval request data 14 directly to the communication path but selects the selection unit. 62, the receiving unit 7 receives the usage permission reply data 18 from the selecting unit 62, not directly from the communication channel, and the selecting unit 62 selects a different communication channel from the plurality of communication channels 5A and 5B each time. Used for sending and receiving. In the selection unit 62, a plurality of communication paths 5A,
5B may be selected at random, or may be selected according to the congestion status of the communication path or the failure occurrence status. Further, in the above description, the configuration is such that the selection unit 62 selects from two communication paths, but it may be configured to select from three or more communication paths.

As described above, according to the fourth embodiment, in addition to the effect of the first embodiment, a different communication path can be used every time, so that even an encrypted decryption key can be sniffed. It is possible to make it difficult and prevent illegal reproduction more effectively, and it is possible to avoid congestion and trouble by monitoring the communication path, so that it is possible to prevent reproduction from being delayed due to these factors.

(Fifth Embodiment) FIG. 12 is a functional block diagram showing the structure of a copyrighted-material data reproducing apparatus 71 according to a fifth embodiment of the present invention. 12 is different from FIG. 1 in that the communication unit 4D is provided with a communication decryption key generation unit 72 for generating a communication decryption key which is switched in synchronization with the information provider side at each communication or at a specific timing, and the communication decryption unit 8A. The point is that the communication decryption key is used to decrypt the encrypted decryption key.
For the communication decryption key generation unit 72, a combination of a memory in which a user-specific parameter is set and a pseudo random number generation circuit, a combination of a user-specific operation circuit and a counter, or the like can be used. Alternatively, these functions may be realized by using a computer program on a microcomputer or a general-purpose computer. Further, in order to synchronize the switching of the communication decryption key between the user side and the information provider side, a timer or a communication device may be further used in combination.

The operation of the copyrighted-material data reproducing apparatus 71 configured as described above will be described below with reference to FIG. The fifth embodiment differs from the first embodiment only in the operations of communication decryption key generation unit 72 and communication decryption unit 8A. That is, ST71 to 7
6 and ST79 to 82 are the same as ST1 to 6 and ST7 to 10 in FIG. 2, and the difference is S
T77 and 78. In the usage permission reply data 18 sent from the information provider to the receiving unit 7 via the communication path 5, the decryption key is encrypted using a different communication decryption key every time or at a specific timing. It is taken out as a decryption key encrypted in. On the other hand, the communication decryption key generation unit 72 generates a communication decryption key which is generated by the same algorithm as that of the information provider side and is switched in synchronization, and when the communication decryption key is converted (ST77). , The communication decryption key is supplied to the communication decryption unit 8A (ST78), and the communication decryption unit 8A
Using the communication decryption key supplied from the communication decryption key generation unit 72, the encrypted decryption key is decrypted and sent to the decryption unit 9 as the decryption key.

As described above, according to the fifth embodiment, in addition to the effect of the first embodiment, the communication decryption key is unique to the user and is switched at each communication or at a specific timing.
It is possible to very effectively prevent illegal decryption, stealing of the decryption key encrypted by intrusion, wiretapping, spoofing, or a combination thereof.

(Sixth Embodiment) FIG. 14 is a functional block diagram showing a structure of a copyrighted-material data reproducing apparatus 81 according to a sixth embodiment of the present invention. 14 is different from FIG. 1 in that an output unit 82 is provided.
As the output unit 82, a transmission device for wired communication, wireless communication, broadcasting or the like or a writing device for an information recording medium such as a video tape or a magnetic disk can be used.

The operation of the copyrighted-materials data reproducing apparatus 81 having the above-described structure will be described below with reference to FIG. The sixth embodiment differs from the first embodiment in that the input data in the input unit 2A is also sent to the output unit 82 as the encrypted copyrighted-material data 11. That is, ST91 and ST93 to 101 are the same as ST1 and ST2 to 10 of FIG. 2, except that in ST92 and ST102, the output unit 82 uses the input data sent from the input unit 2 as the output data 83. The point is that it can be transmitted by wire communication, wireless communication, broadcasting, etc., or can be written in an information recording medium.

As described above, according to the sixth embodiment, in addition to the effects of the first embodiment, since the use approval is required each time the reproduction of the copyrighted-material data is performed, the copyright can be protected, while the copyrighted-character can be protected. Since product data can be copied between devices of the same type, free distribution of information can be promoted.

(Seventh Embodiment) FIG. 16 is a functional block diagram showing the structure of a copyrighted-material data reproducing apparatus 91 according to a seventh embodiment of the present invention. 16 differs from FIG. 1 in that the unique encryption unit 92 and the storage unit 9 are different.
3. The unique decoding unit 94 is provided. Unique encryption unit 9
2 is an arithmetic circuit incorporating an encryption algorithm that is unknown to the user and uses an encryption key unique to the apparatus, and the unique decryption unit 94 is an arithmetic circuit incorporating a decryption algorithm corresponding to the encryption key. Besides being usable, it may be realized by using a computer program on a microcomputer or a general-purpose computer. Also, the storage unit 9
For 3, a large-capacity memory or an external storage device can be used.

The operation of the copyrighted-material data reproducing apparatus 91 having the above-described structure will be described below with reference to FIG. The seventh embodiment is different from the first embodiment in that the input data is also sent to the unique encryption section 92 as the copyrighted work data 11 encrypted in the input section 2B (ST111). This is further encrypted by an algorithm using an encryption key unique to the device (ST112), and the unique encrypted copyrighted material data 11A
Is stored in the storage unit 93 (ST113), and the unique decryption unit 94 takes out the unique encrypted copyrighted work data 11A accumulated from the storage unit 93 and decrypts it with a decryption algorithm corresponding to the encryption key (ST121 ), The original encrypted work data 11 can be supplied to the separation unit 3B. The subsequent ST122 to ST130 are the same as ST2 to ST10 in FIG.

As described above, according to the seventh embodiment, in addition to the effects of the first embodiment, the copyrighted-material data can be stored while protecting the copyrighted-material data from unauthorized intrusion.

[0045]

As described above, according to the present invention, the key for deciphering / decoding encrypted copyrighted-material data is stolen due to illegal intrusion, and the expected unauthorized reproduction of the copyrighted-material data is reproduced. In addition, it is possible to obtain an advantageous effect that an appropriate price can be collected when reproducing the copyrighted-material data.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing a configuration of a copyrighted-material data reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation according to the first embodiment of the present invention.

FIG. 3 is a data format diagram according to the first embodiment of the present invention.

FIG. 4 is a functional block diagram showing a configuration of a copyrighted-material data reproducing apparatus according to the second embodiment of the present invention.

FIG. 5 is a flowchart showing an operation according to the second embodiment of the present invention.

FIG. 6 is a format diagram of data according to the second embodiment of the present invention.

FIG. 7 is a functional block diagram showing the configuration of a copyrighted-material data reproducing apparatus according to the third embodiment of the present invention.

FIG. 8 is a flowchart showing an operation according to the third embodiment of the present invention.

FIG. 9 is a data format diagram according to the third embodiment of the present invention.

FIG. 10 is a functional block diagram showing the configuration of a copyrighted-material data reproducing apparatus according to the fourth embodiment of the present invention.

FIG. 11 is a flowchart showing an operation according to the fourth embodiment of the present invention.

FIG. 12 is a functional block diagram showing the configuration of a copyrighted-material data reproducing apparatus according to the fifth embodiment of the present invention.

FIG. 13 is a flowchart showing an operation according to the fifth embodiment of the present invention.

FIG. 14 is a functional block diagram showing the configuration of a copyrighted-material data reproducing apparatus according to the sixth embodiment of the present invention.

FIG. 15 is a flowchart showing an operation according to the sixth embodiment of the present invention.

FIG. 16 is a functional block diagram showing the configuration of a copyrighted-material data reproducing apparatus according to the seventh embodiment of the present invention.

FIG. 17 is a flowchart showing an operation according to the seventh embodiment of the present invention.

FIG. 18 is a functional block diagram showing a configuration of a conventional copyrighted material data reproducing apparatus.

[Explanation of symbols]

1, 21, 41, 61, 71, 81, 91 Copyrighted data reproducing apparatus 2 Input section 3 Separation section 4 Communication section 5 Communication path 6 Transmission section 7 Reception section 8 Communication decoding section 9 Decoding section 10 Reproduction section 22 Judgment section 42 Authentication input unit 62 Selection unit 72 Communication decryption key generation unit 82 Output unit 92 Unique encryption unit 93 Accumulation unit 94 Unique decryption unit

Claims (9)

[Claims] 1. An encrypted copyrighted material data input from a communication channel or an information recording medium is decrypted by using a decryption key obtained by obtaining approval from an information provider through wired or wireless communication. A method for reproducing copyrighted-material data, characterized by reproducing. 2. An input means for inputting copyrighted material data consisting of a data identifier and an information body encrypted with a different key each time from a communication channel or an information recording medium, and copyrighted material data input from the input means. The separating means for separating the data identifier and the encrypted information body, and the data identifier obtained by the separating means for requesting approval of the use of the copyrighted work data are sent to the information provider, The communication means using wired or wireless communication for obtaining the decryption key used for the copyrighted material data, and the encryption decryption key obtained by the separating means using the decryption key obtained by the communication means Decoding means for decoding the information body, and reproducing means for reproducing the decrypted information body obtained by the decoding means in a state that can be sensed by human visual sense, tactile sense or the like. A copyrighted-material data reproducing device having and. 3. The input means inputs, through a communication channel or an information recording medium, copyrighted material data consisting of a data identifier, condition information, and an information body encrypted with a different key each time only when the condition information is specified. The separating means separates the literary work data input from the input means into a data identifier, condition information, and an information body, and is used based on the condition information obtained by the separating means. An information body obtained by the separating means is provided with a judging means for judging necessity of approval, and when the judgment result obtained by the judging means does not require approval, the functions of the communication means and the decoding means are suppressed. 3. The copyrighted material data reproducing apparatus according to claim 2, wherein the data is directly decoded and supplied to the reproducing means. 4. A communication unit, in which the communication means sends an identifier of data together with user identification information registered in advance to an information provider via a communication channel, and the copyrighted data from the information provider to the copyrighted material data via the communication channel. And a communication decryption unit for decrypting the encrypted decryption key obtained by the receiver using the communication decryption key held therein. The copyrighted material data reproducing apparatus according to claim 2 or 3, further comprising: 5. The transmitter according to claim 4, wherein, when requesting the approval of the use of the copyrighted-material data, the authentication information registered in advance is sent to the information provider together with the data identifier and the user identification information. Copyrighted data reproduction device. 6. The copyrighted material data reproducing apparatus according to claim 4, wherein the transmitting unit and the receiving unit select and use a plurality of communication paths. 7. The copyrighted work according to claim 4, wherein the communication decryption unit decrypts the encrypted decryption key using a communication decryption key that is switched synchronously between the user side and the information provider side. Data playback device. 8. The copyrighted-material data reproducing apparatus according to claim 2, further comprising means for outputting the input data to a communication channel or an information recording medium. 9. A unique encryption means for encrypting input data with a unique encryption key, a storage means for storing the input data uniquely encrypted by the encryption means, and a storage means for storing the input data. 3. A unique decryption means for decrypting the unique encrypted data and supplying it to the separating means.
7. The copyrighted material data reproducing device according to any one of 1 to 7.