JP2004205723A - Digital information recording device, digital information reproducing device, digital information recording/reproducing device, digital information recording method, digital information reproducing method, and digital information recording/reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recoding device for surely protecting the copyright of digital information. <P>SOLUTION: The digital information recording/reproducing device is so constituted that key information for enciphering and deciphering is generated from the ID (identification) number of an IC card 27 and the machine ID stored in a memory 25 of a device main body, and the machine ID of of the memory 25 is stored into the IC card 27, and further, the ID of the IC card 27 is stored into the memory 25 to carry out mutual identification processing by mutually comparing the ID with the ID stored on the other side. When the mutual identification is not established, it is constituted so that the generation of key information is prevented as an unauthorized use. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recording / reproducing apparatus and a recording / reproducing method for digital information, and more particularly to a recording / reproducing apparatus and a recording / reproducing method for information whose copyright is protected by an encryption process.
[0002]
[Prior art]
In digital broadcasting, DVD (Digital Versatile Disk), and the like, the video signal and audio signal that constitute the content to be handled are digital signals, and information is not deteriorated even if recording and reproduction of the acquired content are repeated. Since processing can be easily performed by application software for processing or the like, various measures have been taken from the viewpoint of protecting copyright.
[0003]
One of the measures for copyright protection when recording content is to encrypt and record the content. According to this, even if the recorded content is read out, the encryption is decrypted. Without it, it has no value as information and is protected as copyright.
[0004]
Normally, digital signal encryption processing is performed based on key information, and decryption is also processed by the same key information, so if this key information is leaked, the meaning of encryption will no longer be considered. Will not do it.
Therefore, how to manage key information has become an important issue, and several proposals have been made conventionally. For example, Patent Literature 1 discloses a system in which key information is generated based on information stored in an IC card, and the IC card is managed by a user who has a legitimate right to protect contents. Has been proposed.
[0005]
Alternatively, as disclosed in Patent Document 2, a system has been proposed in which license information issued by a license management organization is stored in an IC card and a content display device, and key information is performed based on the license information.
In Patent Literature 1, the apparatus main body is formed of a personal computer, software for encrypting using an ID number stored in an IC card is installed, and the ID number of an IC card mounted by a user is read and encrypted. It is configured to perform processing.
[0006]
However, in this system, if the person has some knowledge of a personal computer, the dummy data of the IC card is incorporated into the device driver by using the input means of the personal computer, and the device is stored as if it were a regular ID number. Since it can be operated as if an IC card is mounted, it is possible to obtain decrypted contents without an IC card, and it cannot be said that copyright protection is sufficient. .
[0007]
Patent Document 2 also describes that the device can be configured by a personal computer, and in that case, it has the same problem as Patent Document 1.
Furthermore, if the IC card itself is illegally copied, the copyright is no longer protected at all.
[Patent Document 1]
JP 2001-45432 A (page 3 [0020], FIGS. 1 and 2)
[Patent Document 2]
JP-A-2000-113048 (pages 4 [0010], [0011] FIGS. 1 and 3)
[0008]
[Problems to be solved by the invention]
As described above, the conventional system can input the same information as the information stored in the IC card, so that it is very difficult to generate key information and obtain decrypted content. Possible, and there was a problem in terms of copyright protection.
[0009]
SUMMARY OF THE INVENTION The present invention has been made in view of the above points. Even if the same information as that stored in an IC card can be input, digital information recording / reproducing can prevent key information generation. It is an object to provide an apparatus and a recording / reproducing method.
[0010]
[Means for Solving the Problems]
The digital information recording apparatus according to the present invention comprises: an input unit to which a digital information signal is input; a storage unit in which identification information for specifying the device is stored in advance; and a storage medium in which information including a specific ID is stored. A key information generating means for reading the identification information stored in the storage means, and generating key information based on the identification information and the ID information read from the storage medium, and an input to the input means. Encryption means for encrypting the digital information signal based on the key information, and recording means for recording the digital information encrypted by the encryption means on a recording medium. .
[0011]
According to the present invention, since the key information is generated based on two pieces of information, the key information can be surely managed by a genuinely authorized one without being stolen from others.
The digital information reproducing apparatus of the present invention comprises: a reproducing unit for reproducing the digital information from a recording medium on which the digital information encrypted based on the key information is recorded; and a storage unit in which identification information for specifying the device is stored in advance. Reading means for reading the information from a storage medium storing information including a specific ID, reading the identification information stored in the storage means, and reading the identification information and the reading means from the storage medium by the reading means Key information generating means for generating key information based on the obtained ID information, and decryption means for performing decryption processing on the reproduced digital information signal based on the key information. It is characterized.
[0012]
According to the present invention, since the key information is generated based on two pieces of information, the key information can be surely managed by a genuinely authorized one without being stolen from others.
A digital information recording / reproducing apparatus according to the present invention comprises: an input unit to which a digital information signal is input; a storage unit in which identification information for specifying the device is stored in advance; and a storage medium in which information including a specific ID is stored. Reading means for reading information; key information generating means for reading identification information stored in the storage means and generating key information based on the identification information and ID information read from the storage medium by the reading means; Encryption means for encrypting the input digital information signal based on the key information; recording means for recording the digital information encrypted by the encryption means on a recording medium; and Reproducing means for reproducing digital information recorded on a recording medium, and decrypting means for performing decryption processing on the reproduced digital information signal based on the key information , Characterized by comprising a.
[0013]
According to the present invention, since the key information is generated based on two pieces of information, the key information can be surely managed by a genuinely authorized one without being stolen from others.
The digital information recording method according to the present invention includes a step of receiving a digital information signal, a step of generating key information based on identification information for specifying a device and a specific ID information, and a step of: Encrypting based on the information; and recording the encrypted digital information on a recording medium.
[0014]
According to the present invention, since the key information is generated based on two pieces of information, the key information can be surely managed by a genuinely authorized one without being stolen from others.
The digital information reproducing method of the present invention includes the steps of reproducing the digital information from a recording medium on which digital information encrypted based on key information is recorded, identifying information for identifying the device, and specific ID information. Generating key information based on the key information, and decrypting means for performing decryption processing on the reproduced digital information signal based on the key information.
[0015]
According to the present invention, since the key information is generated based on two pieces of information, the key information can be surely managed by a genuinely authorized one without being stolen from others.
In the digital information recording / reproducing method of the present invention, a step of receiving a digital information signal, a step of generating key information based on identification information for specifying a device and a specific ID information, and the step of: Encrypting based on the key information; recording the encrypted digital information on a recording medium; reproducing the digital information recorded on the recording medium; and And performing a decryption process based on the key information.
[0016]
According to the present invention, since the key information is generated based on two pieces of information, the key information can be surely managed by a genuinely authorized one without being stolen from others.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a circuit block diagram of a digital information recording / reproducing apparatus 10 according to the present invention.
In FIG. 1, reference numeral 11 denotes a parabolic antenna which receives digital satellite broadcast radio waves. The antenna 11 is connected to an antenna input terminal 12 via a cable, and the antenna input terminal 12 is connected to a tuner unit 13. The tuner unit 13 performs processing such as channel selection of digital satellite broadcasting, demodulation of a received signal of the selected channel, and error correction, and outputs a transport stream (Transport Stream: TS) signal from the tuner unit 13. You. The TS signal from the tuner unit 13 is supplied to a descrambler 14. If the signal has been subjected to scramble processing, the signal is descrambled here and supplied to the demultiplexer 15. When the scramble processing is not performed, the TS signal passes through the descrambler 14 as it is and is supplied to the demultiplexer 15.
[0018]
In the demultiplexer 15, an EPG (Electric Program) related to a broadcast program (content) included in the TS signal, a video signal and an audio signal, data relating to the program content such as a program name and a performer, and broadcast programs of all channels. Guide) Separately outputs data and additional data such as a weather forecast that is not related to a program. Here, the description of the additional data not directly related to the invention will be omitted.
[0019]
The video signal, the audio signal, and the data separated by the demultiplexer 15 are supplied to a decoder 16 where they are decoded. The video signal and audio signal constituting the program are decoded by Moving Picture Experts Group (MPEG) 2, and the audio signal is subjected to predetermined processing by an audio signal processing unit 17 as necessary and is converted into an analog signal. It is converted and output from the audio output unit 18 composed of, for example, a speaker. As for the video signal, graphics such as characters and symbols are superimposed as necessary in the graphics processing section 19, and further subjected to predetermined processing as necessary, and converted into an analog signal. It is supplied to the display unit 20 and displayed.
[0020]
Further, the EPG data separated by the demultiplexer 15 is also decoded by the decoder, constructed into a program table by the graphics processing unit 19, and sent to the display unit 20.
The tuner unit 12, the descrambler 14, the demultiplexer 15, the MPEG decoder 16, the audio signal processing unit 17, and the graphics processing unit 19 are controlled by a control unit 21. The control unit 21 can be operated by a user. The operation unit 22 is connected to control various functions such as channel switching.
[0021]
Further, a storage device 23 for recording the contents constituting the broadcast program is provided, and control for recording the contents in the storage device 23 is also performed by the control unit 21. That is, for example, when the user operates the operation unit 22, the control unit 21 extracts the EPG data from the control unit 21 to the demultiplexer 15, the decoder 16, and the graphics processing unit 19, decodes the EPG data, and generates display program table data. And the user selects a program to be recorded on the EPG display screen, and the control unit 21 stores the program information of the program in the internal memory as recording reservation information.
[0022]
When the broadcast of the program reserved for recording is started, the control unit 21 supplies the TS signal from the demultiplexer 15 to the storage device 23 via the encryption / decryption unit 24 as it is, and records the TS signal. I do.
In the encryption / decryption unit 24, the TS signal is encrypted under the control of the control unit 21. For encryption, a key code (key information) is required, and this key code is given from the control unit 21. The control unit 21 is connected to a memory 25 in which a device ID for specifying the device is recorded, and provides the control unit 21 with the device ID. Further, an IC card I / F (Inter Face) 26 is connected to the control unit 21, and an ID number is given from the IC card which can be mounted to the apparatus via the IC card I / F 26. Has been.
[0023]
The control unit 21 generates a key code from the two pieces of ID information of the machine ID from the memory 25 and the ID number from the IC card I / F 26, outputs the key code to the encryption / decryption unit 24, and outputs the key code. The decryption unit 24 performs an encryption process on the TS signal supplied from the demultiplexer 15 using the key code, and supplies the TS signal to the storage device 23 to record it.
[0024]
Here, whether or not the ID number of the IC card is a legitimate one is confirmed by a mutual authentication process. That is, the ID number of a regular IC card taken in via the IC card I / F 26 is stored in the memory 25, and the machine ID stored in the memory 25 is stored in the control unit 21 via the IC card I / F 26. 27 to be stored. Next, when the IC card 27 is inserted, the device ID stored in the IC card 27 is compared with the device ID stored in the memory 25, and the ID number of the IC card stored in the memory 25 is further compared. The ID numbers of the IC card 27 and the attached IC card 27 are compared. As a result of both comparison processes, a match is detected, and it is confirmed that the regular IC card 27 is attached to the regular device.
[0025]
The reproduction from the storage device 23 is performed by the user operating the operation unit 22, and is read from the storage device 23 under the control of the control unit 21, and is recorded by the encryption / decryption unit 24 by the control unit 21. Decryption processing is performed using the same key code as at the time. The decrypted playback signal is output to a decoder 16 via a demultiplexer 15 and decoded, an audio signal is output from an audio signal processing unit 17 via an audio output unit 18, and a video signal is output to a graphics processing unit. From the display unit 20. Also in this case, as in the case of recording, the decryption process is executed after it is determined whether or not a legitimate IC card is mounted by the mutual authentication process of the IC card ID number and the machine ID.
[0026]
As described above, according to the apparatus of the present invention, the key code is generated based on the two pieces of ID information of the ID number from the IC card and the machine ID from the memory 25. Even if the same ID number can be input, it is difficult to generate correct key information, and the copyright can be reliably protected.
[0027]
The operation of the circuit block shown in FIG. 1 will be further described with reference to the flowchart of FIG. The process starts in step S10. In step S11, it is determined whether the ID number of the IC card 27 and the machine ID from the memory 25 have been read. If the reading of the ID number and the machine ID of the IC card 27 has not been completed normally in step S11, the process returns to step S11. If the reading of the card ID number and the machine ID has been completed normally in step S11, it is determined in step S12 whether the ID number and the machine ID of the IC card are normal. Mutual authentication is used for the determination.
[0028]
If the card ID number and the machine ID are not confirmed to be legitimate, it is determined that the IC card is being used illegally, and a warning is issued in step S13 for illegal use. If the card ID number and the machine ID are determined to be legitimate, encryption key information is generated based on both the card ID number and the machine ID in step S14.
[0029]
Next, in step S15, it is determined whether the operation mode is set to the recording mode or the reproduction mode. If the operation mode is set to the recording mode, the TS signal from the demultiplexer 15 is output to the step S14 in step S16. The TS signal encrypted by the key information generated in step S17 and encrypted in step S17 is recorded, and the process ends in step S18.
[0030]
If it is determined in step S15 that the playback mode is set, the encryption of the reproduced TS signal is decrypted in step S19 based on the key information generated in step S14, and the decrypted TS signal is decrypted in step S20. Decode the signal. The decoded signal is subjected to video / audio output processing in step S21 and output, and ends in step S18.
[0031]
As described above, since the key information is obtained by the card ID number and the machine ID, the protection of the key information can be sufficiently performed, so that the copyright can be surely protected.
By generating key information after confirming that the IC card 27 is genuine, it is possible to prevent unauthorized use of the IC card.
FIG. 3 is a flowchart showing the confirmation processing (step S12) for confirming whether the IC card ID and the machine ID in FIG. The confirmation processing of the IC card ID and the machine ID is based on mutual authentication. In this case, B-CAS (Bs-Conditional Access System) used in digital satellite broadcasting as an IC card and used to confirm a subscriber. (Registered trademark) card 27 is used.
[0032]
In mutual authentication, first, the ID of the B-CAS card 28 and the machine ID are stored in the other party, and then the ID stored in the other party is read and compared with its own ID to confirm that the IDs are correct. Things.
In FIG. 3, step S30 is a step of starting a flow of mutual authentication writing of the B-CAS card ID and the machine ID. After starting in step S30, a process of reading an ID from the BS card 27 is executed in step S31, and then the B-CAS card ID is stored in the memory 25 in step S32. Next, in step S33, a process of reading the device ID stored in the memory 25 is performed, and in step S34, the device ID is written to the B-CAS card 27. With the above, the mutual authentication writing flow ends.
[0033]
Next, the flow proceeds to a mutual authentication flow of the B-CAS card ID and the machine ID. After starting at step 35, the machine ID written on the B-CAS card 27 is read at step S36, and then the memory 25 is read at step S37. Read the B-CAS card ID stored in. In step S38, it is determined whether or not the ID of the B-CAS card 27 matches the B-CAS card ID stored in the memory 25. If not, it is determined that the ID mutual authentication has not been determined, and In S39, a process is performed based on the fact that the ID mutual recognition is not proper. The process in step S39 is the same as, for example, step S13 shown in FIG. 2, and is a warning against illegal use.
[0034]
If it is determined in step S38 that the ID of the B-CAS card 27 matches the B-CAS card ID stored in the memory 25, then in step S40, the device ID of the memory 25 and the B-CAS card 27 are stored in the B-CAS card 27. It is determined whether or not the acquired machine ID matches. If not, it is determined that the ID mutual authentication has not been determined, and a process based on the fact that the ID mutual authentication is not proper is performed in step S39. The process in step S39 is the same as, for example, step S13 shown in FIG. 2, and is a warning against illegal use.
[0035]
If it is determined in step S40 that the machine ID in the memory 25 matches the machine ID stored in the B-CAS card 27, the process in step S41 is executed, assuming that ID mutual authentication has been determined. The process of step S41 is the same as step S14 shown in FIG. That is, encryption key information is generated.
[0036]
By performing the above mutual authentication processing, the regular card ID number was input as dummy data when the regular IC card was not inserted, when the device was changed, and when the regular IC card was not inserted. In any case, since mutual authentication is not performed, it is recognized as unauthorized use and key information cannot be generated. Therefore, the decryption cannot be performed, and the copyright can be protected.
[0037]
In the above description, an IC card is used, but any storage medium other than an IC card can be applied as long as it can store its own ID number and store the ID of the machine.
As described above, according to the present invention, the key information is generated from the ID number of the storage medium and the machine ID of the apparatus, and the means for mutually authenticating the ID number of the storage medium and the machine ID is provided. With this arrangement, even if the ID number of the storage medium is input as a dummy, the ID number is recognized as unauthorized use, so that the copyright can be properly protected.
[0038]
【The invention's effect】
As described above, according to the present invention, the key information is generated from the ID number of the storage medium and the machine ID of the apparatus, and the means for mutually authenticating the ID number of the storage medium and the machine ID is provided. With the provision, the copyright can be surely protected.
[Brief description of the drawings]
FIG. 1 is a circuit block diagram showing a digital information recording / reproducing apparatus according to the present invention.
FIG. 2 is a flowchart for explaining the operation of the apparatus shown in FIG. 1;
FIG. 3 is a flowchart showing details of a main part of the flowchart shown in FIG. 2;
[Explanation of symbols]
11 parabolic antenna 12 antenna input terminal 13 tuner unit 14 descrambler 15 demultiplexer 16 MPEG decoder 17 audio signal processing unit 19 graphics processing unit 21 control unit 22 operation unit 23 storage device 24 ... Encryption / decryption unit 25 ... Memory 26 ... IC card I / F
27 ... IC card

Claims (18)

Input means for receiving a digital information signal;
Storage means in which identification information for specifying the device is stored in advance,
Means for reading the information from a storage medium storing information including a specific ID, reading the identification information stored in the storage means, and a key based on the identification information and the ID information read from the storage medium. Key information generating means for generating information;
Encryption means for encrypting the digital information signal input to the input means based on the key information,
Recording means for recording digital information encrypted by the encryption means on a recording medium,
A digital information recording device comprising: Reproducing means for reproducing the digital information from a recording medium on which digital information encrypted based on the key information is recorded,
Storage means in which identification information for specifying the device is stored in advance,
Reading means for reading the information from a storage medium in which information including a specific ID is stored;
Key information generation means for reading the identification information stored in the storage means and generating key information based on the identification information and the ID information read by the reading means from the storage medium;
Decryption means for performing decryption processing on the reproduced digital information signal based on the key information;
A digital information reproducing apparatus comprising: Input means for receiving a digital information signal;
Storage means in which identification information for specifying the device is stored in advance,
Reading means for reading the information from a storage medium in which information including a specific ID is stored;
Key information generation means for reading the identification information stored in the storage means and generating key information based on the identification information and the ID information read by the reading means from the storage medium;
Encryption means for encrypting the input digital information signal based on the key information,
Recording means for recording digital information encrypted by the encryption means on a recording medium,
Reproducing means for reproducing digital information recorded on a recording medium by the recording means; decryption means for performing decryption processing on the reproduced digital information signal based on the key information;
A digital information recording / reproducing apparatus comprising: Receiving a digital information signal;
Generating key information based on the identification information for identifying the device and the specific ID information;
Encrypting the input digital information signal based on the key information,
Recording the encrypted digital information on a recording medium;
A digital information recording method, comprising: Reproducing the digital information from a recording medium on which the digital information encrypted based on the key information is recorded,
Generating key information based on the identification information for identifying the device and the specific ID information;
Decryption means for performing decryption processing on the reproduced digital information signal based on the key information;
A digital information reproducing method, comprising: Receiving a digital information signal;
Generating key information based on the identification information for identifying the device and the specific ID information;
Encrypting the input digital information signal based on the key information,
Recording the encrypted digital information on a recording medium;
Reproducing digital information recorded on the recording medium;
Performing a decryption process on the reproduced digital information signal based on the key information;
A digital information recording / reproducing method, comprising: 2. The digital information recording apparatus according to claim 1, further comprising means for mutually authenticating identification information for specifying the apparatus and specific ID information. 2. The digital information recording apparatus according to claim 1, wherein the specific ID information is stored in a card-shaped storage medium provided to be detachable from the apparatus. 3. The digital information reproducing apparatus according to claim 2, further comprising: means for mutually authenticating identification information for specifying the apparatus and specific ID information. 3. The digital information reproducing apparatus according to claim 2, wherein the specific ID information is stored in a card-shaped storage medium that is detachably provided to the apparatus. 4. The digital information recording / reproducing apparatus according to claim 3, further comprising means for mutually authenticating identification information for specifying the apparatus and specific ID information. 4. The digital information recording / reproducing apparatus according to claim 3, wherein the specific ID information is stored in a card-shaped storage medium provided detachably to the apparatus. 5. The digital information recording method according to claim 4, further comprising the step of mutually authenticating identification information for specifying the device and specific ID information. 5. The digital information recording method according to claim 4, wherein the specific ID information is stored in a card-shaped storage medium that is detachably provided to the device. 6. The digital information reproducing method according to claim 5, further comprising a step of mutually authenticating identification information specifying the device and specific ID information. The digital information reproducing method according to claim 5, wherein the specific ID information is stored in a card-shaped storage medium that is detachably provided to the device. 7. The digital information recording / reproducing method according to claim 6, further comprising a step of mutually authenticating identification information for specifying the device and specific ID information. 7. The digital information recording / reproducing method according to claim 6, wherein the specific ID information is stored in a card-shaped storage medium provided detachably with respect to the device.

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