JP2002025187A - Method for authenticating reproducing device and recording device, and recording and reproducing device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for authenticating a reproducing device and a recording device and a recording/reproducing device using the same, capable of preventing external equipment from performing illegal copying by a simple configuration. SOLUTION: Recording device 1 requests to a reproducing device 7 not to output the digital data to a digital signal line 15 via a serial bus line 16; the reproducing device 7 receiving the request halts outputting of the digital data to the digital signal line 15 for a prescribed period. Unless the digital data is inputted from the digital signal line 15 only for the prescribed period, a recording device 1 judges that it is connected with a normal reproducing device via the digital signal line 15. Then the reproducing device and the recording device authenticates each other by permitting the reproducing device 7 to output the digital data via the serial bus line 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for authenticating a reproducing apparatus and a recording apparatus and a recording / reproducing apparatus using the authentication method.

[0002]

2. Description of the Related Art Conventionally, in a recording / reproducing apparatus, mutual authentication between a separate reproducing apparatus and a recording apparatus is generally performed through a serial bus line connected to the reproducing apparatus and the recording apparatus. .

The recording / reproducing apparatus has a configuration as shown in FIG. Device information of the playback device 7 is transmitted from the playback device 7 to the recording device 1 via the serial bus line 16. In the recording device 1, a microcomputer (not shown) provided therein determines whether or not the playback device 7 is a legitimate device based on the device information of the playback device 7 inputted via the serial bus line 16. judge. Further, device information of the recording device 1 is transmitted from the recording device 1 to the reproduction device 7 via the serial bus line 16. In the reproducing device 7, a microcomputer (not shown) provided therein determines whether or not the recording device 1 is an authorized device based on the device information of the recording device 1 input through the serial bus line 16. judge.

[0004] With such an operation, mutual authentication between the recording device 1 and the reproducing device 7 is performed via the serial bus line 16. As a result of the mutual authentication, when each device authenticates each other as a legitimate device, the recording device 1 is in a recordable state, the reproducing device 7 is in a reproducible state, and digital data is transmitted via the digital signal line 15. Then, copying is performed by being output from the playback device 7 to the recording device 1. As a result, it is possible to prevent unauthorized copying that is performed in a state where no legitimate device is connected to the serious bus line 16.

[0005]

However, in such a recording / reproducing apparatus, since the mutual authentication between the reproducing device 7 and the recording device 1 is performed only by the serial bus line 16, FIG.
As shown in (b), even when a playback device 13 (hereinafter, referred to as “external playback device”) other than the playback device mutually authenticated by the serial bus line 16 is connected to the digital signal line input terminal of the recording device 1. Thus, digital data can be transmitted from the external reproduction device 13 which should be prohibited by mutual authentication.

As shown in FIG. 7C, a recording device 17 (hereinafter, referred to as an “external recording device”) other than the recording device mutually authenticated by the serial bus line 16 is connected to a digital signal line output terminal of the reproducing device 7. Is connected, the mutual authentication is established and digital data transmission to the external recording device 17 which should be prohibited is possible.

In order to prevent unauthorized copying using the external reproduction device 13 or the external recording device 17 in the related art, not only the mutual authentication by the serial bus line 16 but also the digital transmission by the digital signal line 15 is performed. Data was encrypted and decrypted.

However, when the digital data transmitted by the digital signal line 15 is encrypted and decrypted, the configuration of the recording / reproducing device becomes complicated and the cost increases.

The present invention has been made in view of the above problems, and has as its object to provide a method of authenticating a reproducing apparatus and a recording apparatus which can prevent unauthorized copying with a simple configuration, and a recording / reproducing apparatus using the authentication method. Aim.

[0010]

In order to achieve the above object, in a method for authenticating a reproducing apparatus and a recording apparatus according to the present invention, the first transmission means transmits digital data from the reproducing apparatus to the recording apparatus. The second transmission unit recognizes each other's information, and a period during which the playback device does not output the digital data to the first transmission unit is provided. Based on the period, the playback device and the recording device are output. Are characterized by performing mutual authentication.

Further, in the authentication method for a reproducing apparatus and a recording apparatus according to the present invention, digital data is transmitted from the reproducing apparatus to the recording apparatus by a first transmitting means, and mutual data is transmitted by a second transmitting means. The recording device recognizes the information of the device and requests the recording device to output the digital data to the first transmission device for a predetermined period of time via the second transmission device. Receives the request, stops outputting the digital data to the first transmission means for a predetermined period,
If there is no input of the digital data from the first transmission unit for a predetermined period, it is determined that the first transmission unit is connected to the normal reproduction device, and the second transmission unit is transmitted to the reproduction device. The output of the digital data is permitted via the digital camera.

In the method of authenticating a reproducing apparatus and a recording apparatus according to the present invention, digital data is transmitted from the reproducing apparatus to the recording apparatus by a first transmitting unit, and mutual data is transmitted by a second transmitting unit. While recognizing device information, the recording device stores a plurality of output patterns of the digital data requested to the playback device, and selects the output pattern from the output pattern to the playback device via a second transmission unit. The reproducing device outputs the digital data to the first transmission unit for a predetermined period in response to the request for the arbitrary output pattern, and the recording device outputs the first If the digital data input from the transmission unit is in accordance with the arbitrary output pattern, it is determined that the digital data is connected to the normal reproduction device by the first transmission unit. Cross and, with respect to the reproducing apparatus, and via a second transmission means characterized by permitting the digital data output.

Further, the output pattern is a pattern in which output and non-output are alternately repeated, and the recording device generates a random number, and selects an arbitrary output pattern from the output pattern based on the random number. Good.

Further, in the recording / reproducing apparatus according to the present invention, the reproducing apparatus, the recording apparatus, the first transmitting means,
Transmission means, and performing mutual authentication between the playback device and the recording device using the authentication method.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of the recording / reproducing apparatus of the first embodiment. The same parts as those of the conventional recording / reproducing apparatus are denoted by the same reference numerals.

The recording / reproducing apparatus includes a recording device 1, a reproducing device 7, and a digital signal line 15 and a serial bus line 16 connecting the recording device 1 and the reproducing device 7. Note that the digital signal line 15 and the serial bus line 16 are contained in one cable.

The recording device 1 includes a microcomputer 3
(Hereinafter, referred to as “microcomputer”), and
Is provided with a microcomputer 9 (hereinafter, referred to as “microcomputer”).

The device information S1 of the playback device 7 is transmitted from the serial input / output means 11 in the microcomputer 9 to the serial input / output means 6 in the microcomputer 3 via the serial bus line 16. In the recording device 1, the device information S 1 of the reproducing device 7 is sent from the serial input / output unit 6 to the determination unit 5 in the microcomputer 3. The determination unit 5 determines whether or not the playback device 7 is a legitimate device based on the device information S1 of the playback device 7.

The device information S2 of the recording device 1 is transmitted from the serial input / output means 6 in the microcomputer 3 to the serial input / output means 11 in the microcomputer 9 via the serial bus line 16. In the reproducing device 7, the serial input / output unit 11
Sends the device information S2 of the recording device 1 to the determination means 12 in the microcomputer 9. The determination unit 12 determines whether or not the recording device 1 is a legitimate device based on the device information S2 of the recording device 1.

By such an operation, mutual authentication between the recording device 1 and the reproducing device 7 is performed via the serial bus line 16.

The output means 8 of the playback device 7 is controlled by the control means 10 in the microcomputer 9 to control the
The digital data recorded in 1 is reproduced and output to the digital signal line 15 as digital data S3.

The input means 2 of the recording device 1 is controlled by the control means 4 in the microcomputer 3, receives the digital data S3 from the digital signal line 15, and records the digital data S3 on the MD20.

Even when the reproducing device 7 is not in the reproducing state, that is, when the output means 8 does not output the digital data S3, the digital data S4 containing the predetermined information (there is no reproducing data, the status of the device, the sampling Data such as frequency) is constantly output from the reproducing device 7 to the recording device 1 via the digital signal line 15.

The input means 2 includes a PLL (Phase Locked L).
oop) is provided (not shown). When the digital data S3 or S4 is output from the output unit 8, the PLL provided in the input unit 2 is in a state where the internal frequency is fixed (hereinafter, referred to as a "LOCK state"). When the digital data S3 is not output, the digital data S4 is always output, so the PLL provided in the input means 2 is always in the LOCK state.

Here, if the output of the digital data S4 from the output means 8 is temporarily stopped for a predetermined period, the PLL provided in the input means 2 is set to a state in which the internal frequency is not fixed for a predetermined period (hereinafter, referred to as "the PLL"). , "UNLOCK state").

In addition to the mutual authentication by the serial bus line 16 described above, mutual authentication based on a change in the state of the PLL provided in the input means 2 is performed. This operation will be described with reference to the flowchart of FIG.

When the user performs an operation of recording digital data to be reproduced by the reproducing device 7 on the recording medium by the recording device 1, the operation of the flowchart shown in FIG. 2 starts. The serial input / output means 6 of the recording device 1 transmits the output stop signal S5 to the serial input / output means 11 of the reproduction device 7 via the serial bus line 16 (step #).
100). The serial input / output means 11 outputs the output stop signal S
5 is received (step # 200). Output stop signal S5
Is sent to the output means 8 via the determination means 12. The output means 8 stops outputting the digital data S4 to the digital signal line 15 for a predetermined period based on the output stop signal S5 (step # 205).

Since the PLL provided in the input means 2 does not output the digital data S4 from the output means 8, the PLL is in the UNLOCK state for a predetermined period (step # 10).
5).

When a predetermined period has elapsed and the output of the digital data S4 from the output means 8 is restarted (# 210), the PLL provided in the input means 2 goes into the LOCK state (step # 110). P provided in the input means 2
Data indicating whether the LL is in the LOCK state or the UNLOCK state has been sent to the determination means 5 in the microcomputer 3, and the determination means 5 determines whether the PLL has been in the UNLOCK state only for a predetermined period (step # 115).

If the PLL is not in the UNLOCK state only for a predetermined period (N in step # 115), the discriminating means 5 transmits through the serial input / output means 6, the serial bus line 16, the serial input / output means 11, and the discriminating means 12. A reproduction non-permission signal is sent to the output means 8 so that the reproduction device 7 cannot perform reproduction, and a recording non-permission signal is transmitted to the input means 2 so that the recording device 1 cannot perform recording (step # 120). ). That is, the mutual authentication is not established, and the operation of the mutual authentication ends without the digital data S3 being recorded on the MD 20.

On the other hand, the PLL is in UNLOC only for a predetermined period.
If it is in the K state (Y in step # 115), the determination means 5
Sends a reproduction permission signal to the output means 8 via the serial input / output means 6, the serial bus line 16, the serial input / output means 11, and the discrimination means 12 so that the reproduction device 7 can perform reproduction. Send a record permission signal to
Enable the recording device 1 to perform recording (step # 12)
5). That is, mutual authentication is established. Thereafter, the playback device 7 starts playback (step # 215), and the recording device 1 starts recording (step # 130).
The digital data S3 starts to be recorded on the MD 20, and the operation of the mutual authentication ends.

After that, when the user performs an operation of recording digital data to be reproduced by the reproducing device 7 on the recording medium by the recording device 1, each time the user performs the mutual authentication by the serial bus line 16 and the above-described flowchart. Perform mutual authentication based on

Thus, digital data transmission from an external reproduction device can be prevented. As shown in FIG. 3, when an external reproduction device 13 is connected to the recording device 1 via a digital signal line 14, the serial bus line 1
6 is connected to the recording device 1 and the reproducing device 7,
In the mutual authentication using the serial bus line 16, it is determined that the devices are connected to a proper device.

However, in such a configuration, since the PLL of the input means 2 does not enter the UNLOCK state, as a result of the determination in step # 115 in the flowchart of FIG. Does not enter the state. Therefore, unauthorized copying using the external reproduction device 13 can be prevented.

Further, transmission of digital data to an external recording device can be prevented. As shown in FIG. 4, an external recording device 17 is connected to the reproducing device 7 via a digital signal line 18.
Are connected, the serial bus line 16 is connected to the recording device 1 and the playback device 7, and thus the mutual authentication using the serial bus line 16 determines that the devices are connected to each other.

However, in such a configuration, the PLL of the input means 2 is always in the UNLOCK state.
As a result of the determination in step # 115 in the flowchart of step # 115, the process proceeds to step # 120, and the playback device 1 does not enter the playable state. Therefore, illegal copying using the external recording device 17 can be prevented.

Next, a second embodiment will be described. The configuration diagram of the recording / reproducing apparatus of the second embodiment is as shown in FIG. 1 as in the first embodiment. In the second embodiment, as in the first embodiment, in addition to the mutual authentication using the serial bus line 16, mutual authentication based on a change in the state of the PLL provided in the input unit 2 is performed. This operation will be described with reference to the flowchart of FIG.

The microcomputer 3 of the recording device 1 generates a random number (step # 300) and uses the generated random number as a pattern number n
(Step # 305). The discriminating means 5 corresponds to FIG.
A data table as shown in (a) is stored in advance. The microcomputer 3 obtains the output switching signal S6 _n corresponding to the pattern number n from the data table, and transmits the output switching signal S6 _n from the serial input / output means 6 (step # 310).

The serial input / output means 11 receives the output switching signal S6 _n via the serial bus line 16 (Step # 400). The determination means 12 outputs the output switching signal S6
A predetermined output / non-output switching pattern corresponding to _n is switched at a cycle T stored in advance, converted into a signal S7 as shown in FIG. 6B, and transmitted to the output means 8 (step # 405). The signal S7 shown in FIG. 6 (b) corresponds to the output switching signal S6 _1. The digital data S4 sent from the output means 8 to the input means 2 via the digital signal line 15 is output when the signal S7 is in the “1” section, and is not output when the signal S7 is in the “0” section. As a result, the digital data S4 is switched between output and non-output in the cycle T for a predetermined period according to the output switching signal S6 _n .

In the PLL provided in the input means 2,
Switching between the LOCK state and the UNLOCK state occurs at a period T for a predetermined period in accordance with the switching of the output / non-output of the digital data S4 sent from the output means 8 via the digital signal line 15 (step # 315).

After a lapse of a predetermined period, the output means 8 always resumes outputting digital data S4 (step #).
410), and the P provided in the input means 2 accordingly.
LL remains in the LOCK state (step # 32)
0). In step # 325, the determination unit 5 determines whether the LOCK state of the PLL provided in the input unit 2 / UNLOC
FIG. 6 shows whether the switching of the K state is the same as the pattern number n.
The determination is made based on the data table shown in FIG.

If the switching of the LOCK state / UNLOCK state of the PLL is not the pattern number n (N in step # 325), the serial input / output means 6, the serial bus line 16, the serial input / output means 11, and the determination means 1
A reproduction non-permission signal is sent to the output means 8 via the input device 2 so that the reproduction device 7 cannot perform reproduction, and a recording non-permission signal is transmitted to the input device 2 so that the recording device 1 cannot perform recording. (Step # 330). That is, the mutual authentication is not established, and the operation of the mutual authentication ends without the digital data S3 being recorded on the MD 20.

On the other hand, the LOCK state of the PLL / UNLOC
If the switching of the K state is n pattern numbers (Y in step # 325), the reproduction permission signal is sent to the output means 8 via the serial input / output means 6, the serial bus line 16, the serial input / output means 11, and the determination means 12. To enable the playback device 7 to perform playback, and sends a recording permission signal to the input means 2 so that the recording device 1 can perform recording (step # 335). That is, mutual authentication is established. Thereafter, the reproduction device 7 starts reproduction (step # 415), and the recording device 1 starts recording (step # 340), whereby digital data S3 starts to be recorded on the MD 20, and the operation of mutual authentication ends.

In this embodiment, since one output pattern is selected from a large number of output patterns based on random numbers, the authentication method becomes more complicated than in the first embodiment. Thereby, a more secure authentication method can be realized.

The data table may be set differently for each recording / reproducing device. For example, the recording device 22
The data table shown in FIG. 6C is stored in advance in the storage device 23, and the data table shown in FIG. 6D is stored in the recording device 23 in advance. In this way, as shown in FIG. 8, the recording devices 22 and 23 of the same model are
Even if it is attempted to copy to a plurality of MDs at once by connecting in parallel to each other, since the data tables stored in the respective recording devices are different, the recording devices 22 and 23 are mutually authenticated with the reproducing device 7. Cannot be established and cannot be used. Further, the cycle T may be set differently for each recording / reproducing device.

In the first and second embodiments, cables are used for the digital signal line 15 and the serial bus line 16, but the present invention is not limited to this. For example, light and radio waves are used. Similar effects can be obtained when applied to a wireless system. In the case of the wireless system, the range of use of the recording / reproducing device is wider than that of the cable system.

In the first and second embodiments, the mutual authentication is performed based on the output / non-output of the digital data S4 regardless of the reproduction speed and the recording speed. The mutual authentication based on the output / non-output of the digital data S4 may not be performed, and the mutual authentication based on the output / non-output of the digital data S4 may be performed only when the reproduction speed and the recording speed are equal to or higher than the double speed.

In the first and second embodiments, the recording device 1 transmits the signal S5 or S6 _n to the serial bus line 16.
And the reproducing device 7 outputs / non-outputs the digital data S4 according to the signal. However, the present invention is not limited to this. For example, the recording / reproducing device differs one by one for each recording / reproducing device. The output / non-output pattern of the digital data S4 is set, and the microcomputer 9 of the playback device 7 stores the output / non-output pattern of the digital data S4 in advance,
The microcomputer of the recording device 1 uses the LOCK / UNLO of the PLL corresponding to the output / non-output pattern of the digital data S4.
The configuration may be such that the CK state pattern is stored in advance.

In the first and second embodiments,
The CD 21 was reproduced and the reproduced data was recorded on the MD 20, but the present invention is not limited to this.
The VD-ROM is reproduced, and the reproduced data is transferred to a DVD-RA
The same effect can be obtained by using another recording medium such as recording on M.

[0050]

According to the present invention, the reproducing apparatus and the recording apparatus perform mutual authentication based on the period during which the reproducing apparatus does not output digital data to the first transmission means. A configuration in which one end of the digital signal line is connected to an external recording device or an external reproduction device by connecting the digital signal line to an apparatus can prevent unauthorized copying. Further, since the configuration is simpler than that of the prior art illegal copy prevention method in which digital data is encrypted by a reproducing apparatus and decrypted by a recording apparatus, the cost can be reduced.

Also, in a configuration in which the recording device determines that the digital data is connected to the normal reproducing device by the first transmission device if the digital data is not input from the first transmission device only for a predetermined period, Similar effects can be obtained.

Further, according to the present invention, the recording apparatus stores a plurality of output patterns of digital data required for the reproducing apparatus and selects an arbitrary pattern from the output patterns, so that the recording apparatus has only one output pattern. The authentication method is more secure than in the case, and illegal copy can be surely prevented.

According to the present invention, the output pattern is a pattern in which output and non-output are alternately repeated.
A large number of patterns can be easily set. Also,
Since an arbitrary output pattern is selected from a plurality of output patterns based on the generated random numbers, a more secure authentication method can be achieved, and unauthorized copying can be more reliably prevented. Further, by setting the correspondence between the random number and the output pattern differently for each recording / reproducing device, it is possible to prevent illegal copying from being performed by using a plurality of recording devices of the same model connected in parallel.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a recording / reproducing apparatus according to the present invention.

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

FIG. 3 is a block diagram showing a configuration when an external reproduction device is connected to the recording / reproduction device according to the present invention.

FIG. 4 is a block diagram showing a configuration when an external recording device is connected to the recording / reproducing apparatus according to the present invention.

FIG. 5 is a flowchart showing an operation in the second embodiment.

FIG. 6 is a diagram illustrating an output switching signal.

FIG. 7 is a block diagram illustrating a configuration of a conventional recording / reproducing apparatus.

FIG. 8 is a block diagram showing a configuration in which recording devices of the same model are connected in parallel.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 recording device 2 input means 3 microcomputer 4 control means 5 discriminating means 6 serial input / output means 7 playback device 8 output means 9 microcomputer 10 control means 11 serial input / output means 12 discriminating means 13 external playback device 14 digital signal line 15 digital Signal line 16 Serial bus line 17 External recording device 18 Digital signal line 20 MD 21 CD 22 Recording device 23 Recording device

Claims (5)

[Claims] 1. A method for authenticating a reproducing apparatus and a recording apparatus, in which digital data is transmitted from a reproducing apparatus to a recording apparatus by a first transmitting means and information of each apparatus is recognized by a second transmitting means, Providing a period during which the playback device does not output the digital data to the first transmission unit, and performing mutual authentication between the playback device and the recording device based on the period. Method. 2. The recording device requests the reproducing device via a second transmitting device not to output the digital data to the first transmitting device for a predetermined period, and the reproducing device performs the request. The output of the digital data to the first transmission means is stopped for a predetermined period in response to the reception of the digital data. 2. The transmission device according to claim 1, wherein the transmission unit determines that the digital data is connected to an authorized reproduction device, and permits the reproduction device to output the digital data through a second transmission device. 3. An authentication method between a playback device and a recording device. 3. The recording apparatus stores a plurality of output patterns of the digital data requested to the reproducing apparatus, and selects from the output patterns the reproducing apparatus via a second transmission unit. Requesting an arbitrary output pattern, the reproducing device outputs the digital data to the first transmission means for a predetermined period according to the request of the arbitrary output pattern, and the recording device performs a first transmission If the digital data input from the means is in accordance with the arbitrary output pattern,
2. The apparatus according to claim 1, wherein the first transmission unit determines that the digital data is connected to an authorized reproduction device, and permits the reproduction device to output the digital data via the second transmission unit. An authentication method between the reproducing device and the recording device according to the above. 4. The output pattern is a pattern in which output and non-output are alternately repeated, and the recording apparatus generates a random number, and selects an arbitrary output pattern from the output pattern based on the random number. The authentication method for a playback device and a recording device according to claim 3. 5. A reproducing apparatus, a recording apparatus, a first transmitting means, and a second transmitting means, and authentication of the reproducing apparatus and the recording apparatus according to claim 1. A recording / reproducing apparatus for performing mutual authentication between the reproducing apparatus and the recording apparatus using a method.