JPH09307543A - Book data reproduction method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively protect a copyright by preventing illegal reproduction in the case of reproducing electronic processing book data. SOLUTION: The same ciphering decoding key as that used sequentially when book data are provided is stored to a removable decoding key storage section 3 and in the case of data reproduction, a decoding key read section 4 reads sequentially a ciphering decoding key from the storage section 3, a decoding section 5 decodes book data received at an input section 2 and ciphered and a reproduction section 6 reproduces the decoded data. Since a ciphering decoding key is deleted from the storage section 3 for each reading, illegal reproduction of book data due to peep of a key or illegal copy is prevented and a proper cost is collected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention can protect a copyrighted work from unauthorized use and collect an appropriate copyright consideration when digitizing copyrighted work data for distribution. 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 a digital information protection method and a processing apparatus thereof is known.

A conventional copyrighted-material data reproducing apparatus will be described below with reference to FIG. In FIG. 8, reference numeral 101 denotes a copyrighted-material data reproducing apparatus, 102 denotes an input unit for inputting encrypted copyrighted-material data, and 103 has a common key previously stored for decrypting the encrypted copyrighted-material data. A common key storage unit 104 is a decryption unit that decrypts the encrypted copyrighted-material data using the common key, and a reproduction unit 105 is a reproducing unit that reproduces the copyrighted-material data in a state that 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 risk that this common key may be intercepted or illegally copied, and as a result, encrypted copyrighted-material data may be illegally reproduced.

The present invention solves the above-mentioned problems of the prior art, and prevents the unauthorized reproduction of copyrighted work data by peeping at a key for decrypting / decoding encrypted copyrighted work data or illegal copying. Therefore, it is an object of the present invention to provide a copyrighted material data reproducing method and an apparatus for reproducing the copyrighted material data, in which an appropriate price can be collected when reproducing the copyrighted material data.

[0007]

In order to achieve the above object, the present invention encrypts copyrighted work data with a different decryption key for each predetermined information unit and stores the key, When decrypting physical data, the stored decryption key is read and decrypted.
The feature is that the read decryption key is made unreadable after decryption, and it is possible to prevent snooping and illegal copying of the decryption key. The process of making the read decryption key unreadable is performed by erasing data, applying a key or scramble, or destroying data.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is one in which copyrighted data is encrypted by a different decryption key for each predetermined information unit and the key is stored, and the copyrighted data is stored. When decrypting, the stored decryption key is read and decrypted, and after decryption, the read decryption key is made unreadable. Can be prevented.

According to the second aspect of the present invention, when there are a plurality of pieces of copyrighted work data encrypted by different decryption keys for each information unit, the sequence of the copyrighted work data and the order of storing the decryption keys And the decryption key is read out in the same order as the above, and it is possible to prevent snooping and illegal copying of the decryption key by a simple method.

According to a third aspect of the present invention, when there are a plurality of pieces of copyrighted work data encrypted by different decryption keys for each information unit, an index is added to the copyrighted work data and arranged, and the index is added. According to the method, the decryption key is read out, and even if the arrangement of the work data and the arrangement of the decryption key are different, the work data and the decryption key can be matched.

According to a fourth aspect of the present invention, there is provided an input means for inputting, through a communication channel or an information recording medium, copyrighted work data encrypted by a different key for each predetermined information unit, and the copyrighted work data. Detachable decryption key storage means sequentially storing the same decryption key as that used at the time of provision, decryption key reading means for sequentially reading the decryption key from the decryption key storage means, and decryption key reading means. Decoding means for decoding the encrypted copyrighted material data obtained by the inputting means by using the decryption key, and the state in which the decrypted copyrighted material data obtained by the decrypting means can be sensed by the human visual sense or tactile sense. And a decryption key storage means,
It is characterized in that the stored decryption key is made unreadable each time it is read. The decryption key is switched for each information unit, and once read, it becomes unreadable. It is possible to prevent unauthorized playback by snooping or illegal copying, and protect copyright. Further, by setting the number of the decryption keys to be recorded in the decryption key storage means in accordance with the consideration payment at the time of contract with the copyrighted-material data provider, it is possible to collect an appropriate consideration.

The invention according to claim 5 of the present invention provides:
Counting means for counting the number of information units input from the input means, and storage means for storing the encrypted copyrighted work data input from the input means in combination with the count value obtained by the counting means for each information unit. And a retrieval means for retrieving the encrypted desired literary work data and the corresponding count value from the storage means, and the decryption key reading means uses the count value obtained by the retrieval means as an index from the decryption key storage means. It is characterized by reading the cryptanalysis key recorded in the order position of, and since the copyrighted material data can be temporarily stored and reproduced in any order, it is possible to combine the supply of multiple copyrighted material data at once. It is possible to receive or receive other copyrighted material data that has been accumulated while receiving the copyrighted material data. To become.

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a functional block diagram of a copyrighted-material data reproducing apparatus according to the first embodiment of the present 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 when inputting from a communication path such as a wired or wireless communication, a receiving apparatus or a recording medium is used. When inputting, the reading device corresponds to this. Denoted by 3 is a detachable decryption key storage unit in which decryption keys for decrypting encrypted copyrighted data are sequentially stored, 4 is a decryption key reading unit for extracting the decryption key from the decryption key storage unit 3, and 5 is a decryption key reading unit. A decryption unit that decrypts the encrypted copyrighted-material data by using a decryption key, and a reproducing unit 6 that reproduces the copyrighted-material data in a state that can be sensed by human's audiovisual sense or tactile sense. At the time of making a contract with a copyrighted-material data provider, a plurality of encryption-decryption keys are written and stored in the decryption key storage unit 3 in the same content and in the same order as those used for the subsequent provision of the copyrighted-material data. .

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 for each information unit predetermined as a plurality of copyrighted works, and is input to the input unit 2 (ST
1). In the input unit 2, after the input data is subjected to error correction and the like, it is sent to the decryption unit 5 as encrypted copyrighted work data, and the delimiter of the information unit is detected from the input data, and the deciphering key is given as the delimiter signal a. It is supplied to the reading unit 4. The decryption key reading unit 4 generates a read signal b from the delimiter signal a and supplies the read signal b to the decryption key storage unit 3. In the decryption key storage unit 3, each time the read signal b is given, the stored decryption key c is stored. Are sequentially taken out one by one from the beginning and sent to the decryption key reading unit 4, and the extracted decryption key c is erased from the memory (ST
2). When the decryption key c can be obtained (ST3), the decryption key reading unit 4 holds the decryption key c until the next delimiter signal a is supplied, and the decryption unit 5 stores the decryption key c as the decryption key c. Supply to. The decryption unit 5 decrypts the encrypted copyrighted work data for each information unit using the decryption key c (ST4). The copyrighted-material data decrypted by the decryption unit 5 is sent to the reproduction unit 6, reproduced by the reproduction unit 6 in a state that can be sensed by human hearing, tactile sense, or the like, and output (ST5). If the decryption key c is not sent from the decryption key storage unit 8 (ST3), the process is finished as it is (ST6).

Next, referring to the functional block diagram shown in FIG. 3, for a detailed configuration example and operation of the decryption key storage unit 3 of the copyrighted material data reproducing apparatus 1 in the first embodiment shown in FIG. explain. In FIG. 3, reference numeral 7 is a multi-stage shift register in which the decryption key is packed and stored one step before the final stage, and 8 is a gate for controlling the output of the decryption key. Such a decryption key storage unit 3 can be realized by configuring the above circuit on an IC card, for example.

Decryption key storage unit 3 configured as described above
Now, the operation will be described below. First, the input signal d supplied to the multi-stage shift register 7 is the one to which the decryption key used when the copyrighted data is subsequently provided is sequentially given at the time of writing the decryption key. When is attached to the copyrighted material data reproducing apparatus 1, a value unrelated to the decryption key is input. The multi-stage shift register 7 operates at the rising edge of the read signal b as a clock, erases the last-used cryptanalysis key in the last stage, and sends the unused cryptanalysis key in sequence, and the first one is placed in the last stage. It is pushed out and supplied to the gate 8 as a new decryption key. The gate 8 passes the new decryption key only when the read signal b is at the H level, and outputs it as the decryption key c.

Here, the state in which the decryption key is stored in the decryption key storage unit 3 and the way in which the decryption key is used will be described with reference to FIG. A decryption key storage unit 3 of a copyrighted-material reproduction apparatus 1 of a user who receives provision of copyrighted-material data;
Management table 1 of device 11 of copyrighted material data provider
2 has a decryption key table 13. The contents of this table 13, that is, the number and contents of decryption keys
The order is determined by the provider when the user makes a contract with the provider, and the number is determined, for example, according to the consideration payment of the user, and stored / managed for each user in the management table 12. Further, the same contents are written and stored in the detachable decryption key storage unit 3 in the same order. The user receives the provision of the decryption key storage unit 3 from the provider, mounts it on the copyrighted-material data reproducing apparatus 1, and uses it.

When the user receives the copyrighted-material data, the copyrighted-material data is encrypted for each predetermined information unit by sequentially using the decryption key stored in the management table 12 from the beginning. , And is supplied via the communication path 14 or the like. In FIG. 4, the copyrighted material data is the decryption key K.
An example of the case where the two information units 15 and 16 encrypted with 1 and K2 are arranged is shown. In reproducing these, the decryption key table 13 of the decryption key storage unit 3 is sequentially referred to from the beginning, and the information units 15 and 16 are decrypted by the decryption keys K1 and K2 and reproduced. This time,
In the management table 12, after providing the copyrighted material data,
In the decryption key storage unit 3, after the reproduction of the copyrighted material data, the decryption keys K1 and K2 are the decryption key table 1
3, the decryption key will be used sequentially from K3 next time. Since the decryption key is erased from the decryption key storage unit 3 once referred to, there is no fear of being intercepted or illegally copied, and since the decryption key is managed for each user in the management table 12, other users' The decryption key storage unit 3 cannot be stolen and used.

As described above, according to the present embodiment, the detachable decryption key storage unit 3 in which the same decryption key that is sequentially used when the copyrighted material data is provided is sequentially stored, and the decryption key storage unit 3 And a decryption key reading unit 4 for sequentially reading the decryption key from, and the decryption key stored in the decryption key storage unit 3 is erased each time it is read.
It is possible to prevent unauthorized reproduction of copyrighted material data by sneaking / unauthorized copying of decryption key and protect copyright.
Further, by setting the number of decryption keys to be recorded in the decryption key storage unit 3 according to the consideration payment at the time of contracting with the copyrighted-material data provider, it is possible to collect an appropriate consideration for reproduction of the copyrighted material. It will be possible.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a functional block diagram of the copyrighted material data reproducing apparatus according to the second embodiment of the present invention. In FIG. 5, reference numeral 21 is a copyrighted-material data reproducing apparatus, 22 is an input unit for inputting encrypted copyrighted-material data, 23 is a counting unit for counting the number of information units in the input copyrighted-material data, and 24 Is a storage unit that stores the input copyrighted work data in combination with a count value for each information unit, 25 is a retrieval unit that retrieves the desired desired copyrighted work data and the corresponding count value, and 26 is an encrypted copyrighted work Detachable deciphering key storage unit in which deciphering deciphering keys for deciphering data are sequentially stored, 27 is a deciphering key reading unit that takes out deciphering deciphering keys from the deciphering key storage unit using the count value as an index,
Reference numeral 28 is a decryption unit that decrypts the encrypted copyrighted-material data by using a decryption key, and reference numeral 29 is a reproduction unit that reproduces the copyrighted-material data in a state that can be sensed by the human sense of sight or touch. At the time of making a contract with the copyrighted data provider, a plurality of decryption keys (for example, the number corresponding to the payment of the price) are stored in the decryption key storage unit 26 when the copyrighted data is provided thereafter, as in FIG. The same contents as those used are written and stored in the same order.

The operation of the copyrighted-material data reproducing apparatus 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 for each information unit predetermined as a plurality of copyrighted works and input to the input unit 22 (ST1
1). The input unit 22 performs error correction and the like on the input data and then sends it to the storage unit 24 as encrypted literary work data, detects a division of an information unit from the input data, and outputs it as a division signal a to the counting unit 23. Supply. The counting unit 23 receives the delimiter signal a as a count input, counts the number of input information units in the past (ST12), and outputs the count value e as a result of the delimiter signal a.
It is sent together with the storage unit 24. In the storage unit 24, the input unit 2
The encrypted copyrighted data sent from No. 2 corresponds to the count value e sent from the counting unit 23 for each information unit.
Are combined and stored with the delimiter signal a (ST1
3).

On the other hand, in the take-out section 25, when reproducing the stored desired copyrighted-material data according to a user's instruction (ST21), the information unit forming the copyrighted-material data and the corresponding count value e are accumulated in the accumulating section 24. Are sequentially taken out (ST22), the count value e and the delimiter signal a are supplied to the decryption key reading unit 27, and the array of information units is sent to the decoding unit 28 as encrypted copyrighted work data. The decryption key reading unit 27 uses the count value e as it is, generates a read signal b from the delimiter signal a, and supplies these to the decryption key storage unit 26. In the decryption key storage unit 26, the stored decryption key c is counted by the count value e every time the read signal b is given.
Is taken as an index from the ordinal position one by one and sent to the decryption key reading section 27, and the decryption key c is erased from the memory (ST23). In the decryption key reading unit 27, when the decryption key c can be obtained (ST24), the decryption key c is used as the next delimiter signal a.
Is held until it is supplied, and is supplied to the decryption unit 28 as a decryption key c. The decryption unit 28 decrypts the encrypted copyrighted-material data for each information unit using the supplied decryption key c (ST25). The copyrighted material data decrypted by the decryption unit 28 is sent to the reproduction unit 29, and the reproduction unit 2
At 9, the information is reproduced and output in a state in which it can be sensed by the human visual sense or tactile sense (ST26). Decryption key storage unit 26
If the decryption key c is not sent from (ST2
4) Then, the process is terminated as it is (ST27).

Next, regarding the detailed configuration example and operation of the decryption key storage unit 26 of the copyrighted-material data reproducing apparatus 21 in the second embodiment of the present invention shown in FIG. 5, a functional block diagram shown in FIG. 7 is shown. It will be described with reference to FIG. In FIG. 7, 3
1 is an address decoding unit that decodes a memory address from the count value e, 32 is a timing generation unit that generates two timing signals for memory reading and writing from the read signal b, and 33 is a deciphering key that is sequentially stored from the head address position. It is a memory circuit. Such a decryption key storage unit 26 can be realized by configuring the above circuit on an IC card, for example.

Decryption key storage unit 2 configured as described above
6, the operation will be described below. First, as for the input signal d supplied to the memory circuit 33, when the decryption key is written, the decryption key used when the copyrighted material data is provided thereafter is sequentially given. When mounted on the copyrighted material data reproducing apparatus 21, a value unrelated to the decryption key is input. The address decoding unit 31 receives the count value e as an input, decodes the memory address, and supplies it as the address signal f to the memory circuit 33. The timing generation unit 32 generates a memory read timing signal g that is temporarily valid at the rising edge of the read signal b and a memory write timing signal h that is temporarily valid at the falling edge of the read signal b, and supplies this to the memory circuit 33. . When the memory read timing signal g is valid, the memory circuit 33 extracts and outputs the decryption key c stored at the address position designated by the address signal f, and the memory write timing signal h is valid. In this case, the input signal d is overwritten and erased from above the decryption key c stored in the address position designated by the address signal f.

Here, the state in which the decryption key is stored in the decryption key storage unit 26 and the manner in which the decryption key is used are as follows.
Although it is almost the same as that shown in FIG. 4, the reference position of the decryption key table 13 in the decryption key storage unit 26 is
The difference is that it is selected not only at the beginning of the table.

As described above, according to the present embodiment, the counting unit 23 that counts the number of information units in the input copyrighted-material data, and the accumulation that accumulates the copyrighted-material data in combination with the count value for each information unit A section 24, a take-out section 25 for taking out a count value corresponding to the accumulated desired copyrighted-material data, and a detachable decryption-key storage section in which the same decryption keys that are sequentially used when providing the copyrighted-material data are sequentially stored. 26 and a decryption key reading unit 27 that reads the decryption key from the decryption key storage unit 26 using the count value as an index. The decryption key stored in the decryption key storage unit 26 is erased each time it is read. It is possible to prevent unauthorized reproduction of copyrighted material data by sneaking / unauthorized copying of decryption key and protect copyright. Further, by setting the number of decryption keys to be recorded in the decryption key storage unit 26 according to the consideration payment at the time of contract with the copyrighted-material data provider, it is possible to collect an appropriate compensation for reproduction of the copyrighted material. It will be possible. In addition, since copyrighted material data can be temporarily stored and played in any order,
It is also possible to collectively receive a plurality of pieces of copyrighted-material data at one time or to reproduce another piece of copyrighted-material data that is accumulated while receiving the supply of copyrighted-material data.

[0027]

According to the present invention, as is apparent from the above-mentioned embodiment, the decryption key stored in the decryption key storage means is made unreadable each time it is read, so that the decryption key is set for each information unit. To prevent unauthorized viewing of the decryption key or unauthorized reproduction due to illegal copying, protect copyright, and determine the number of decryption keys to be recorded in the decryption key storage means when contracting with a copyrighted data provider. By setting the number according to the payment of consideration, it is possible to collect an appropriate consideration.

Further, as is apparent from the second embodiment, the present invention enables the temporary storage of the copyrighted-material data and the reproduction in an arbitrary order in addition to the above-mentioned effects, so that a plurality of the copyrighted-material data can be supplied once. Therefore, it is possible to collectively receive the copyrighted work data and to reproduce the other copyrighted work data accumulated while receiving the supply of the copyrighted work data.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing an operation in the first embodiment.

FIG. 3 is a functional block diagram of a decryption key storage unit of the copyrighted material data reproducing apparatus according to the first embodiment.

FIG. 4 is a schematic diagram showing how the decryption key according to the first embodiment is used.

FIG. 5 is a functional block diagram of a copyrighted material data reproducing device according to a second embodiment of the present invention.

FIG. 6 is a flowchart showing an operation in the second embodiment.

FIG. 7 is a functional block diagram of a decryption key storage unit of the copyrighted material data reproducing apparatus according to the second embodiment.

FIG. 8 is a functional block diagram of a conventional copyrighted material data reproducing device.

[Explanation of symbols]

 1, 21 Copyright data reproducing device 2, 22 Input unit 3, 26 Decryption key storage unit 4, 27 Decryption key reading unit 5, 28 Decryption unit 6, 29 Reproduction unit 23 Counting unit 24 Storage unit 25 Retrieval unit

Claims (5)

[Claims] 1. The copyrighted material data is encrypted by a different decryption key for each predetermined information unit and the key is stored, and when decrypting the copyrighted material data, the stored decryption key is used. Read and decrypt,
A method for reproducing copyrighted material data, characterized by making the read decryption key unreadable after decryption. 2. When there are a plurality of pieces of copyrighted work data encrypted by different decryption keys for each information unit, the arrangement of the copyrighted work data and the order of storing the decryption keys are made the same, and according to the order. 2. The copyrighted material data reproducing method according to claim 1, wherein the decryption key is read out. 3. When there are a plurality of copyrighted work data encrypted by different decryption keys for each information unit, the copyrighted work data is indexed and arranged, and the decryption key is read according to the index. The copyrighted material data reproducing method according to claim 1. 4. An input means for inputting, through a communication channel or an information recording medium, copyrighted work data encrypted by a different key for each predetermined information unit, and the same decryption as that used in sequence when providing the copyrighted work data. Detachable key storage means in which keys are sequentially stored, decryption key reading means for sequentially reading the decryption key from the decryption key storage means, and the input using the decryption key obtained by the decryption key reading means A decrypting means for decrypting the encrypted copyrighted-material data obtained by the means, and a reproducing means for reproducing the decrypted copyrighted-material data obtained by the decrypting means in a state in which the audiovisual or tactile sense of a human can be detected. The decryption key storage means renders the stored decryption key unreadable each time it is read. Object data playback device. 5. A counting means for counting the number of information units input from the input means, and a count value obtained by the counting means for each information unit of the encrypted copyrighted work data input from the input means. Storage means for storing in combination with the storage means, and extraction means for extracting the encrypted desired copyrighted-material data and the corresponding count value from the storage means, and the decryption key reading means has the count value obtained by the extraction means. 5. The decryption key recorded at the corresponding ordinal position is read from the decryption key storage means by using as an index.
The described copyrighted material data reproducing device.