JP4597266B2 - Digital information recording / reproducing apparatus, digital information receiving apparatus, digital information transmitting / receiving system, digital information receiving method, and digital information transmitting / receiving method - Google Patents

Description

The present invention relates to a recording apparatus or an information recording / reproducing apparatus for recording digital information such as video and audio, and more particularly to limit the recording of digital information on a recording medium with the authority of the copyright holder or the like. Relates to the device.

In the field of television broadcasting, recording and reproducing devices, and package media such as movie software, digital broadcasting has started, and consumer-use digital recording / reproducing devices corresponding to this have been put on the market. Package software for this device will appear in the near future. The advantage of digital broadcasting and digital recording devices is that there is no or very little quality degradation in the information transmission process and recording / reproduction process. However, there are problems in that many good quality copies of information are made around the place where the copyright holder does not know, and when the copy is repeated, profits are not returned to the copyright holder.

U.S. Pat. US Pat. No. 5,896,454 discloses a method of attaching 2-bit copy control information to information. This is a copy prohibition (Copy Never) at the will of copyright holders and information creators.
, Copy authorization (Copy Free), copy authorization for only one generation (Copy One Generation),
By selecting either one, the operation of the recording apparatus is controlled. The recording device does not perform the recording operation if the copy is prohibited, and performs the recording operation if the copy is authorized. If only one generation of copy is authorized, the recorder will give this control information and no more copies (No More Copies).
After rewriting to s), perform the recording operation.

When the copy control information is prohibited from being copied in broadcasting, there is a problem that the user has no means to view the broadcast, such as when there is a visitor. Therefore, JP 2000-149 A
No. 417 discloses a temporary recording (temporary r) even when the copy control information indicates copy prohibition.
A method for solving this problem is disclosed by using a method called “ecording”. In this method, information is physically recorded once on a recording medium, but a period of time for reproduction and viewing is set to, for example, 90 minutes and deleted after reproduction or after the time limit. In other words, it is not stored for a long time and recorded for multipurpose use, but is equivalently delayed and viewed within 90 minutes. Since the recording medium does not remain for a long time, the above inconvenience for the user can be solved without penalizing the copyright holder. Temporary recording is often performed using a hard disk recorder or the like built in the receiving device due to its nature.

Similar temporary recording is possible when the copy control information indicates copy authorization for only one generation. For example, a restriction of 90 minutes or the like is set, and the copy control information on the recording medium is left indicating only one generation of copy authorization within the time limit, and after the time limit has passed, no further copying is permitted. rewrite. This also has the effect of substantially delaying the broadcast by, for example, 90 minutes.

After being rewritten with information that does not permit further copying, it is impossible to copy information from a disk to a tape, for example. This may be inconvenient for the user. Therefore, an operation called “move” is allowed to be recorded again on another recording medium on condition that the information on the original recording medium cannot be reproduced. Since the number of recording media is not increased, the recording media can be changed without penalizing the copyright holder.

The matter disclosed in the above prior art is to make a certain amount of pawl so as not to give a disadvantage to the copyright holder for a copy made by combining a plurality of recording / reproducing apparatuses or recording apparatuses. However, as described above, recently, an increasing number of recording media use a hard disk. If you have some knowledge, remove it from the device
All information can be copied to another hard disk in 1-bit units regardless of the above-described copy control information.

For example, information that was originally Copy One Generation is recorded on the media, and No More Copies.
Even after s is reached, the premise of allowing the above-described operation of “move” is that the information on the original recording medium cannot be reproduced and the number of recording media is not increased. No on the hard disk
If the information that is More Copies is recorded, if it is removed and installed on a PC, it can be copied to another hard disk in the state of No More Copies. If this is attached to the original recording / reproducing apparatus, not only can it be reproduced and viewed, but copy media can be created by “move” by the number copied to the hard disk. This breaks the premise of “move” that does not increase the number of recording media, and disadvantages the producers and copyright holders of information.

Of course, this problem is not limited to the hard disk, but for example CD-RW,
Even if it was originally made to be removable from the device, such as an optical disk such as DVD-RAM, it can be the same if it is attached to a drive connected to a PC and copied to another recording medium in 1-bit units. Will occur.

In view of the above problems, an object of the present invention is to provide means for preventing an increase in the number of information recording media that are No More Copies even when a hard disk is removed, and an apparatus to which this is applied. Kotonia is, after all aimed at improving the usability of the digital information recording and reproducing apparatus and digital information recording and reproducing method in consideration of the copyright.

The above object can be solved by, for example, the invention described in the claims.

According to the present invention, a digital information recording / reproducing apparatus and digital information are taken into consideration while taking copyright into consideration.
Usability of the information recording / reproducing method can be improved.

1 is a block diagram showing an embodiment of an entire digital information transmission / reception recording system to which the present invention is applied. FIG. 2 is a block diagram showing an example of a configuration of an information providing station 1 such as a broadcasting station in FIG. The block diagram which shows an example of a structure of the receiver 3 in FIG. The block diagram which shows an example of a structure of the recording / reproducing apparatus 4 in FIG. The block diagram which shows an example of the periphery of the recording medium of the recording / reproducing apparatus in FIG. The block diagram which shows an example of a structure of the receiver 3 in FIG. The block diagram which shows an example of a structure of the control information signal in this invention. (A) shows what is sent from the information providing station, and (b) shows what is recorded on the recording medium.

Hereinafter, embodiments of the present invention will be described with reference to the drawings as necessary. The present invention relates to a digital information recording apparatus or recording / reproducing apparatus. Before the description, the entire system to which the present invention is applied will be described.

FIG. 1 is a block diagram showing an embodiment of the entire system used in the present invention, and shows an example in which information is transmitted / received by broadcasting and recorded / reproduced. This includes devices to which the present invention is applied. Reference numeral 1 is an information providing station such as a broadcasting station, 2 is a relay station, 3 is a receiving device, 4 is a first recording / reproducing device, 5 is a display, and 6 is a second recording / reproducing device. In addition,
Here, when broadcasting or the like is recorded, it can be recorded on at least one of the first recording / reproducing apparatus 4 and the second recording / reproducing apparatus 6 according to the copy control information attached thereto. The first recording / reproducing apparatus 4 is described here as being based on a digital recording method built in the receiving apparatus 3. The recording medium uses a hard disk as an example. Some video disks, video tapes, etc. can be easily removed, but the recording / playback device built in the receiving device is often used for storing information for a relatively short period of time. Hard disks are often used for purposes. Although the second recording / reproducing apparatus 6 is externally attached to the receiving apparatus 3, the present invention can be applied even if it does not exist or does not function even if it exists. .

An information providing station 1 such as a broadcasting station transmits a signal radio wave modulated by information via a relay station 2 such as a broadcasting satellite. Of course, other transmissions such as cable transmission, telephone line transmission, and terrestrial broadcast transmission may be used. As will be described later, this signal radio wave received by the receiving device 3 on the receiving side is demodulated into an information signal, and then to the first recording / reproducing device 4 and the second recording / reproducing device 6 as necessary. It is recorded as a signal suitable for recording.
Also, it is sent to the display 5. Here, the user can directly view the information content. The information reproduced by the first recording / reproducing apparatus 4 and the second recording / reproducing apparatus 6 is as follows.
The information is given to the display 5 through the receiving device 3 and the original information such as video and audio is viewed.
When a removable recording medium in which information is recorded in advance, for example, package software, is provided, the reproduction operation and the like in, for example, the second recording / reproducing apparatus 6 attached thereto is performed. Information is often exchanged between devices using digital signals. For example, the receiving device 3 and the display 5 may be connected using analog signals.

FIG. 2 is a block diagram showing a configuration example of the information providing station 1 such as a broadcasting station in the above system. 11 is a source generation unit, 12 is an encoding circuit that performs compression by the MPEG system, 13 is a scramble circuit, 14 is a modulation circuit, 15 is a transmission antenna, 16 is a management information adding circuit, 1
Reference numeral 7 denotes an input terminal.

Information such as video and audio generated by the source generation unit 11 including a camera and a recording / reproducing device is compressed by the encoding circuit 12 so that it can be transmitted in a smaller occupied band. If necessary, the scramble circuit 13 performs transmission encryption so that only a specific viewer can view. After being modulated by the modulation circuit 14 so as to be a signal suitable for transmission, the signal is emitted from the transmission antenna 15 as a radio wave toward the relay station 2 such as a broadcasting satellite. At this time, the management information adding circuit 16 adds information such as the current time including the copy control information described above. Further, although omitted from FIG. 1 above, for example, request information is input from the input terminal 17 via a telephone line or the like. This is utilized in a system for determining information to be transmitted in response to a viewer's request such as video on demand.

In practice, a plurality of information is often multiplexed in one radio wave by a method such as time division or spread spectrum. Although not shown in FIG. 2 for simplicity, in this case, the source generator 11
There are a plurality of systems of the encoding circuit 12 and the encoding circuit 12 and the scramble circuit 13.
A multiplex circuit for multiplexing a plurality of pieces of information is placed between the two.

FIG. 3 is a block diagram showing an example of the configuration of the receiving device 3 in the system of FIG. 3
01 is an RF / IF conversion circuit, 302 is a demodulation circuit, 303 is an error correction circuit, 304 is a descrambling circuit for canceling transmission encryption applied to the signal, 305 is a first demultiplexing circuit, and 306 is an input / output terminal 307 is a second demultiplexing circuit, 308 is a decoding circuit,
Reference numerals 309 and 310 denote output terminals, 311 denotes a control circuit for controlling the entire receiving apparatus 3, 312 denotes an information management circuit, 313 denotes a command input circuit, and 314 denotes an input terminal. Reference numeral 4 denotes a first recording / reproducing apparatus, which is assumed to be built in the receiving apparatus 3 as described in FIG. In the figure,
The solid line shows the main information flow such as video and audio, and the dotted line shows the flow of control signal information between the components.

First, the flow of information such as video and audio indicated by solid lines will be described with respect to the components 301 to 310. For example, radio waves from a relay station such as a broadcasting satellite are input to the RF / IF conversion circuit 301. Here, the radio wave in the RF band is frequency-converted to an IF band (Intermediate Frequency) and becomes a signal in a certain band that does not depend on the reception channel, and the modulation operation performed for transmission by the demodulation circuit 302 is demodulated. Further, after an error in the code generated during transmission is detected and corrected by the error correction circuit 303, the descrambling circuit 304 releases the transmission cipher. Thereafter, the data is sent to the first and second demultiplexing circuits 305 and 307. As described above, particularly in the case of digital broadcasting, a plurality of pieces of information are often multiplexed on one channel by a method such as time division or spread spectrum. The demultiplexing circuit separates only desired information from this. The reason why the two demultiplex circuits are provided is not only to enable so-called back program recording, but also to the first demultiplex circuit 3.
This is to remove information not worthy of recording at 05. That is, some information includes weather forecasts,
In many cases, additional information such as a broadcast schedule of a program is attached, which may be viewed at the time of broadcasting, but it is not worth recording and viewing at a later date, so it can be removed here.

The output of the first demultiplexing circuit 305 is given to the first recording / reproducing apparatus 4 and recorded on the recording medium as necessary. The signal is also given to the input / output terminal 306 and exchanges signals with the second recording / reproducing apparatus 6 connected thereto. The input / output terminal 306 is a bidirectional terminal, and exchanges information to be recorded / reproduced with the second recording / reproducing apparatus 6 as digital data, for example. In general, connection according to the IEEE 1394 standard is often used. The second demultiplexing circuit 307 includes information sent from the descrambling circuit 304, information reproduced by the first recording / reproducing device 4, or a second recording / reproducing device from the input / output terminal 306. The information reproduced in step 6 is connected, and information to be viewed is selected, and desired information is further separated. In the next decoding circuit 308, the data compression of the moving image performed before transmission is decoded and sent to an external device via the output terminals 309 and 310. For digital broadcasting, for example, HD (High Definition) information with more than 1000 scanning lines, and 50
There are around zero SD (Standard Definition) information. According to this, the former is HD output,
If the latter is SD output, information on the output terminal 309 may be supplied to an HD-compatible display, and information on the output terminal 310 may be supplied to an SD-compatible display. Output terminals 309, 31
The information of 0 may be either digital or analog depending on the input of the display.

Next, control signals indicated by dotted lines will be described. The control circuit 311 is 3 from the above 301.
Control signals are exchanged between the components 05, 307, and 308, and the entire receiving apparatus 3 is controlled to perform a desired operation. The information management circuit 312 supplies management data when the control circuit 311 performs control in response to a request. For example, reception contract information is managed here. When the user designates a channel to be viewed, this designation is input from the input terminal 314 and sent to the control circuit 311 via the command input circuit 313. The control circuit 311 requests the reception contract information from the information management circuit 312. When it is determined that there is a contract with the channel designated by the user, a control signal is sent to each of the above-described components to instruct the receiving operation of the corresponding channel. The information management circuit 312 manages timer reservation information by the user. When it is time to reserve viewing, the control circuit 311 sends a control signal to each component described above to start a receiving operation.

When the first recording / reproducing device 4 is built in the receiving device 3, the input terminal 314 is used.
The recording / reproducing operation is performed according to the user's instruction input from. This user instruction is given to the control circuit 311 via the command input circuit 313 to control the operation of the first recording / reproducing apparatus 4. Further, depending on the embodiment of the present invention, the control circuit 311 and the first recording / reproducing apparatus 4 may deliver, for example, version information of the recording medium of the hard disk, as will be described later.

Next, the recording / reproducing operation of the digital recording / reproducing apparatus will be described with reference to FIGS. The first recording / reproducing apparatus 4 and the second recording / reproducing apparatus 6 described above may have the same basic circuit block configuration in many parts, and an example using a digital recording system is shown here. In these drawings, the main object is one using a hard disk as a recording medium, but the present invention is not limited to this. The recording medium of the first recording / reproducing apparatus 4 and the second recording / reproducing apparatus 6 may be a hard disk, and if an easily removable medium such as an optical disk or a magnetic tape is used, this is also applicable. The present invention can be applied.

FIG. 4 is a circuit block diagram of a digital recording / reproducing apparatus according to the present invention. 41 is a recording circuit, 4101 is an input terminal for a signal to be recorded, 4102 is a storage means such as a semiconductor memory, 41
03 is an encryption circuit, 4104 is a first encryption key generation circuit, 4105 is a recording encoding circuit, 4106 is an output terminal for a signal to be recorded on a recording medium, 4107 is a medium detection circuit, 4108 is a control detection circuit, 4109 Is a recording control circuit, 4110 is a control signal input / output terminal, and 4111 is a control signal output terminal. Reference numeral 42 denotes a reproduction circuit, 4201 denotes an input terminal for a reproduction signal, 4
202 is a reproduction / decryption circuit, 4203 is a block reproduction circuit, 4204 is a storage means such as a semiconductor memory, 4205 is an error correction circuit, 4206 is an encryption / decryption circuit, 4207 is an input terminal for a second encryption key, and 4208 is a signal output circuit. , 4209 is an output terminal for sending a reproduction signal to a receiver, 4210 is a control signal detection circuit, 4211 is a clock, 4212 is a reproduction control circuit, 421
Reference numeral 3 denotes a control signal input / output terminal, and 4214 denotes a control signal output terminal.

FIG. 5 is a block diagram showing the periphery of the recording medium of the recording / reproducing apparatus. Reference numeral 43 denotes a recording / playback unit, which uses a hard disk as a recording medium, and corresponds to what is usually called a hard disk drive. 4301 is an input terminal, 4302 is a recording amplifier, 4303 is a recording medium drive equipped with a hard disk as a recording medium, 4304 is a reproduction amplifier, 4305 is an output terminal, 4306 is a mechanism control circuit, 4307 is an input terminal, 4308 is a second encryption The key generation circuit 4309 is an output terminal.

First, the operation will be described with reference to FIG. The recording circuit 41 will be described. Information to be recorded is input from the input terminal 4101. This is supplied from the first multiplex circuit 305 of FIG. The information after the transmission cipher is decrypted by the descramble circuit 304 is, of course, within the scope of the present invention when it is supplied without being decrypted.

In the case of the second recording / reproducing apparatus 6, this information is further supplied via the input / output terminal 306, and the output of the information output terminal 4209 reproduced by the reproducing circuit 42 described later is also the input / output terminal shown in FIG. To 306. Therefore, in the second recording / reproducing apparatus 6, 4101 and 4209
Can be combined into a single input / output terminal. Of course, it may be defined by the IEEE 1394 standard.

The input information is temporarily stored in the storage unit 4102 for each block. In addition to digital information such as video and audio, various control information as shown in FIG. In the case of broadcasting, for example, it is given by the management information giving circuit 16 in FIG. This is given to the control detection circuit 4108 to detect control information. Based on this, the recording control circuit 4109 determines whether or not the signal can be recorded, whether or not to encrypt the signal, and the result is sent to the encryption circuit 4103 and the recording encoding circuit 4105. send.

On the other hand, information such as video and audio in the storage unit 4102 is encrypted in the encryption circuit 4103 according to the control signal from the recording control circuit 4109 as necessary. Here, the encryption is performed by the first encryption key generation circuit 4104 and the second encryption key input terminal 4207.
The example performed based on the encryption key from is shown. The former generates a device key such as an identification number of the apparatus, a user key such as a personal ID read by mounting an IC card held by the user on the apparatus. From the latter, as shown in FIG. 5, an identification number unique to the hard disk drive to be used is input. C means copy control information prohibits recording
opy Never, temporary recording for Copy One Generation, which means that only one generation of recording is authorized, or when rewriting the latter as No More Copies, so high security is required. It is often encrypted to give restrictions. The encryption may be double encryption in which information is encrypted using one of the first and second encryption keys, and then the remaining one is used for repeated encryption. The information may be encrypted using a new encryption key obtained by encrypting the remaining encryption key with any one of the encryption keys. This encryption is not an indispensable condition depending on the embodiment, and can also be applied to a case where the encryption is not performed.

The encrypted information is given to the recording encoding circuit 4105. Recording encoding circuit 4105
Then, based on the control information from the recording control circuit 4109, when recording is not performed, the information is blocked here. When recording is performed, modulation suitable for the medium to be used is performed and output to the output terminal 4106.

In addition to the copy control information, the current time of recording output from the clock 4211 is also given from the recording control circuit 4109 to the recording encoding circuit 4105. When recording is possible,
This is also recorded at the same time if necessary. If the current time is included in the received information, it may be used, or the clock 4211 may be calibrated with the received information.

Further, the information signal at the output terminal 4106 is input to the input terminal 43 of the recording / reproducing unit 43 shown in FIG.
Is given to 01. This signal is amplified by the recording amplifier 4302 so that the hard disk head can be driven, and then recorded on the recording medium by the recording medium drive 4303. 4306
Is a mechanism control circuit such as a motor for driving the recording medium drive 4303, and includes an input terminal 4
The recording medium is controlled by a control signal from 307. The second encryption key generation circuit 4308
Generates an encryption key with an identification number (manufacturing number or the like) unique to the hard disk drive and supplies it to the output terminal 4309. This is given to the input terminal 4207 of FIG.

The output of the recording control circuit 4109 shown in FIG. 4 is given to the output terminal 4111. If necessary, this may be given to the input terminal 4307 in FIG. 5 and when the information forbidden to be recorded including the temporary recording described above is inputted, the mechanism control circuit 4306 may be instructed to stop the recording operation. 4 inputs and outputs control signals to / from an external device or the control circuit 311 in FIG. In the case of the second recording / reproducing apparatus 6, IEEE13
It can be shared with the input terminal 4101 and the output terminal 4209 according to the 94 standard.

Next, an operation when reproducing recorded information will be described. Recording medium drive 4303 in FIG.
The information signal reproduced from is amplified to a level that allows signal processing in the subsequent stage by the regenerative amplifier 4304 and then output to the output terminal 4305. A control signal from the output terminal 4214 in FIG. 4 is input to the input terminal 4307 to control the mechanism control circuit 4306. This is generated by the reproduction control circuit 4212. The previous recording control circuit 4109 and the reproduction control circuit 42
12 is usually on the same semiconductor device, and in this case, the output terminals of 4111 and 4214 can be made common.

The information signal at the output terminal 4305 in FIG. 5 is applied to the input terminal 4201 of the reproduction circuit 42 in FIG. This is supplied to the reproduction decoding circuit 4202. Here, the modulation applied on the recording side for recording / reproducing on the medium is demodulated, the waveform is equalized, and the data is determined by the clock. Next, the block reproduction circuit 4203 detects a synchronization signal, an ID signal, etc., and the reproduction data is temporarily stored in a predetermined position of the storage means 4204 based on the detection. The error correction circuit 4205 detects an error in the sign generated in the recording / reproducing process by using a calculation operation from the stored data and corrects it to a correct value. The data after error correction is given to the encryption / decryption circuit 4206. This is for decrypting the recording encryption performed by the previous encryption circuit 4103 during recording. Here, a device key of the apparatus from the first encryption key generation circuit 4207, a user key such as a personal ID, and the like,
Decryption is performed using the second encryption key from the input terminal 4207. Decryption may be performed in the reverse of the above-described encryption. If these are not predetermined ones, normal decryption is not performed and viewing is impossible. Therefore, it is possible to view using the device in the same state as when it was recorded, or to be viewed by a specific user, but in other cases it is difficult to reproduce and view.

On the other hand, the control signal detection circuit 4210 detects, for example, copy control information, recording time, and the like from the data subjected to the previous error correction. Next, the reproduction control circuit 4212 determines whether or not reproduction output is possible based on the detected information and the current time from the clock 4211 and controls the output of the signal output circuit 4208. Alternatively, the encryption / decryption circuit 4206 is operated or stopped. For example, when there is a time limit for the period of reproduction and viewing, and this is over, the signal output circuit 4208 does not output information that can be viewed normally. If necessary, control information may be sent from the output terminal 4214 to the input terminal 4307 in FIG. 5 to stop the reproduction operation of the recording medium drive 4303 itself.

When it is permitted to output the reproduced information including items such as version information of the hard disk drive to be described later, this information is given to the output terminal 4209, and the display 5 is connected via the receiving device 3 of FIG. Supplied to. M applied in the encoding circuit 12 of FIG.
The data amount compression operation by PEG or the like is restored by the decoding circuit 308 of the receiving device 3. For this reason, the user can view the information content. The decoding circuit 308 may be built in the display 5.

When copy control information or the like is different from what has been described so far, when the digital watermark is embedded in the video information, the same control may be performed using the information detected from the digital watermark during reproduction.

Of course, the watch 4211 is required to have a certain degree of accuracy. Anything that can be easily changed by the user's malicious intentions will not serve the purpose. It is desirable that the time information from a broadcasting station or the like be controlled. If the time is changed intentionally, the apparatus may not be operated thereafter.

The input / output terminal 4213 exchanges control information with an external device or the control circuit 311 shown in FIG. For example, it is used when the reproduced information is further recorded in an external recording device. The input / output terminals 4110 and 4213 can be shared. Further, in the second recording / reproducing apparatus 6, for example, in accordance with the IEEE 1394 standard, an input terminal 4101 and an output terminal 420 are provided.
9 information can be exchanged in one system, or can be exchanged wirelessly using infrared rays or the like.

A control signal supplied from the reproduction control circuit 4212 to the recording / encoding circuit 4105 instructs, for example, erasure of information during reproduction. It is used to delete information that has passed the time limit for viewing and to delete information that has been played once regardless of the time limit. When moving the reproduced information to another recording medium, it is necessary to erase it after reproduction, and this is also used at this time. When the recording medium is a disk or the like, the recording encoding circuit 4105 generates a meaningless signal as information according to this control signal, and erases the information by recording on the medium. Alternatively, a part thereof is erased so that it cannot be practically used. In this case, the recording medium must be erasable. The medium detection circuit 4107 is provided for this purpose. This is effective for an apparatus in which a recording medium can be removed, such as the second recording / reproducing apparatus 6. In the case of recording information that is allowed to be recorded on the condition that it is to be deleted, recording is not performed if a medium such as a CD-R that cannot delete information is attached. Also, the reproduction operation is stopped when information is moved from a medium that cannot be erased. These are realized by sending control signals from the medium detection circuit 4107 to the recording encoding circuit 4105 and the reproduction control circuit 4212. When the recording medium is not assumed to be removed as in the first recording / reproducing apparatus 4, the medium detection circuit 4107 is not necessary. The above is the basic operation description of FIG. 4 and FIG.

Next, effects of the embodiment of the present invention shown in FIGS. 4 and 5 will be described. In FIG. 4, the digital information to be recorded is an encryption circuit 4103, an encryption key such as a device key or a user key from the first encryption key generation circuit 4104, and a second encryption key input terminal 420.
7 is encrypted using both the encryption key with the identification number (manufacturing number etc.) unique to the hard disk drive from 7. For this reason, in order to reproduce the recorded digital information, correctly decrypt the encryption by the encryption / decryption circuit 4206, and view normally, the recorded device or user plays it from the hard disk at the time of the first recording. Limited to. For example,
Remove the hard disk drive composed of the recording / reproducing unit 43 shown in FIG. 5 from the recording / reproducing apparatus, attach it to the PC, copy it to the second hard disk drive, and attach the second hard disk drive to the original recording / reproducing apparatus for reproduction. However, the encryption cannot be decrypted,
It cannot be viewed normally. Therefore, No More Copies via PC as described above
It is impossible to increase the number of recording media by repeatedly moving the information. As a result, the original idea of movement, that is, changing the recording medium to be used without increasing the number of recording media, is not destroyed, and the benefits of the creator of the information and the copyright holder can be protected. is there. Also, when temporarily recording information that is Copy Never or Copy One Generation, if the same encryption is performed and the information is copied, it is decrypted when it is copied to another hard disk drive and played back. You cannot do it, and you cannot watch it normally. In this case as well, there is an effect that it is possible to protect the interests of the creator of the information and the copyright holder.

Next, operations and effects of another embodiment to which the present invention is applied will be described with reference to FIGS. The first recording / reproducing device 4 is built in the receiving device 3. Therefore, the control circuit 311
Can manage the history of the recording medium drive 4303 in FIG. Version information that is changed when the recording content of the recording medium is updated is generated by the control circuit 311 and recorded in the management information recording area on the hard disk. This generates version information in the control circuit 311,
This can be realized by supplying to the input / output terminal 4110 in FIG. 4 and multiplexing the digital information by the recording / coding circuit 4105. At the same time, this version information is stored in the information management circuit 312 of FIG. When information is reproduced, the version information is obtained from the reproduced information by the control detection circuit 42.
10 is applied to the reproduction control circuit 4212. On the other hand, the version information stored in the information management circuit 312 is read out and provided to the reproduction control circuit 4212 via the control circuit 311 and the input / output terminal 4213, so that it can be determined whether or not both match. If they match, the reproduced information is output to the output terminal 4209. If they do not match, the decryption in the encryption / decryption circuit 4206 is stopped, or the output operation in the signal output circuit 4208 is stopped.

With the above operation, even if the recording / reproducing unit 43 is detached and attached to a PC or the like and copied to another hard disk drive, it is impossible to reproduce and use it even if it is attached to the first recording / reproducing device 4. . In addition, even if the data copied to another hard disk drive is copied again to the original hard disk drive, it cannot be played back and used.
This is because information related to recording progress such as version information is updated when copying to another hard disk drive with a PC or the like, and the reproduced version information is stored in the information management circuit 312 even if the information is reproduced. This is because they do not match. For this reason,
Regardless of the content of the copy control information using the PC, even if the hard disk is copied to another hard disk, it cannot be used as effective information, and the number of recording media is not increased by the movement operation. Therefore, the original concept of movement of changing the recording medium to be used without increasing the number of recording media is not destroyed, and there is an effect that the interest of the creator of the information and the copyright holder can be protected.

In FIG. 4, as an example, when information is recorded, since it is encrypted using a second encryption key unique to the recording medium, it is possible to attach, reproduce, and use a copy copied to another hard disk. You can stop it. However, if it is restored to the original hard disk drive, it can be played back and used. According to the present embodiment, it is possible to eliminate the meaning of the operation of removing and copying with a PC, so that the profits of the producer and the copyright holder can be protected more completely.

For normal users who use without removing the hard disk drive, version information and information recorded in the management area on the hard disk each time new information is recorded and the recorded information is deleted The version information stored in the management circuit 312 changes at the same time. Therefore, by performing these operations, the information on the hard disk is not made unusable. The control circuit 311 is not involved in changing the information on the hard disk and preventing another hard disk drive from being attached and reproduced.

In the above description, the information stored in the information management circuit 312 is version information. However, the present invention is not limited to this. Any information may be used as long as it represents the recording progress of the recording medium, such as directory information of the recording medium and information on the date and time when the recording content was last updated.
5 includes the recording amplifier 4302, the reproduction amplifier 4304, the mechanism control circuit 4306, the second encryption key generation circuit 4308, and the like. However, the present invention is not limited to this. Some components may be missing. The recording medium portion of the hard disk may exist alone. Needless to say, if an optical disk or the like is used as the recording medium, the recording medium portion is a single unit.

Next, another embodiment of the present invention will be described. In this case, the encryption key from the input terminal 4207 in FIG. 4 is not provided from the second encryption key generation circuit 4308 in FIG. 5, but is provided from the control circuit 311 in FIG. 3 as described above. It is information such as. At this time, the encryption key is changed each time new digital information is additionally recorded and erased, that is, whenever the version information changes. For this reason, the information management circuit 312 needs to store version information at the time of recording for all of the information on the recording medium without being erased. When the corresponding information is deleted, the version information at that time is deleted.

Next, a case where a device for storing version information and the like is not built in the receiving apparatus 3 and is externally attached will be described with reference to the circuit block diagram of FIG. In FIG. 6, unlike FIG. 3, the control circuit 311 is also connected to the output terminal 315, and the board 7 that is externally attached to the receiving device 3.
And exchange information. In FIG. 3, the version of the hard disk drive is indicated by the information management circuit 3
12 is stored in the external board 7 that can be removed. For this reason, the board 7 has, for example, a flash memory. This may be something like an IC card. Only a specific user who owns the board 7 can reproduce and use the information recorded in the first recording / reproducing apparatus 4. When the key generated by the first encryption key generation circuit 4104 in FIG. 4 is a user key, it may be generated from the board 7 separately from the above version information without being generated here. In this way, the use of a third party other than the user can be restricted, and the profits of the producer and copyright holder can be further protected. In this case as well, instead of the version information described above, directory information of the recording medium, information on the date and time when the recorded content was last updated, and the like may be used.

Furthermore, regardless of whether or not it is a user key, if the encryption key is generated from the board 7, the information is moved from the recording medium to another medium, etc. When erasing, the purpose can be achieved if the encryption key on the board 7 is erased. The erase operation can be simplified. Of course, even when the encryption key is generated in the information management circuit 312 as shown in FIG. 3, the encryption key of the information management circuit 312 may be deleted in the same case. In the above description, the first recording / reproducing apparatus 4 built in the receiving apparatus 3 is mainly targeted, but the present invention can be similarly applied to the second recording / reproducing apparatus 6 externally attached thereto.

Next, FIG. 7 is a block diagram showing a configuration example of the control information signal in the present embodiment. FIG. 7A shows control information received by the receiving device 3 and input to the first recording / reproducing device 4 or the second recording / reproducing device 6 and detected by the control detection circuit 4108 on the recording side. . FIG.
(B) shows the control information that is rewritten as necessary based on the control information shown in FIG. 7 (a) in the recording encoding circuit 4105 and is added to the recording medium and recorded on the recording medium. Control information shown in FIG. 7B is recorded in advance in package software or the like. Of FIG. 7B, FIG.
Items based on the information in a) are associated with the same numbers. For example, in the case of a tape medium, it is sufficient that one piece of information in FIG. 7B is recorded on one recording track.
Of course, it is recorded in a fixed relationship with information data such as video and audio, and can be easily separated during reproduction.

The contents of FIG. 7 will be described in comparison with the circuit block diagram of FIG. 4 as necessary. In FIG. 7B, a program number 100 indicates what number program is in the medium.

Sector information 101 is a sector number obtained by dividing a program by a predetermined unit when recording on a medium. The division may be a fixed unit, for example, a unit of 2 kbytes, or a fixed unit of information, for example, a unit for division when encoding. The number may be given in the program or may be a serial number for the entire recording medium. Information such as a recording time 107b described later is added in units of sectors.

The time information 102 indicates how long the recorded part has passed since the start of the program. The above has been added when recording information on a recording medium.

The type 103b indicates attribute information such as whether the program is sold, rented, self-made, or broadcast. As indicated by reference numeral 103a in FIG. 7A, if it is added from the transmission stage, it may be recorded as it is.

Next, the copy control 104a in FIG. 7A indicates whether or not the information can be recorded on the medium. Copy Never (copy prohibited), Copy One Generation (copy authorization for one generation only)
, Copy Free (copy authorization) is selected and determined by the copyright holder, such as the creator of the information. In broadcasting, it is often given by the management information adding circuit 16 shown in FIG.
The copy control 104b in FIG. 7B is obtained by rewriting the recording / coding circuit 4105 in FIG. 4 as necessary based on the information of 104a. 104a is Copy
If it indicates Free, you can record it as it is. When indicating Copy One Generation, in principle, rewrite and record as No More Copies (copied once with Copy One Generation, copy prohibited beyond this). If temporary recording to be described later is permitted, Copy One
It is temporarily recorded either as Generation or rewritten as No More Copies. If 104a indicates Copy Never, recording is not possible in principle, but if temporary recording is permitted, recording is performed with Copy Never. If the information software is provided on a recording medium, the right holder records it at the time of creation. That is, Copy Never, Copy One Generation, No
Since there are a total of four states such as More Copies and Copy Free, it can be transmitted with 2-bit information. Copy Never is (1,1), Copy One Generation is (1,0), No More Copies is (
0,1), Copy free is (0,0), etc.

APS 105a is a copy control information (APS; Analogue Protec) to analog recording device.
tion System (corresponding to an analog copy control signal). For example, this is disclosed in JP-A-61.
Whether or not copying to an analog recording device is controlled by adding a pseudo sync pulse to an analog video signal as described in Japanese Patent No. -288582. This is APS1 as it is
It may be recorded as 05b.

Pause 106a indicates whether or not temporary recording can be performed when the copy control information 104a indicates Copy Never. Temporary recording is called a Pause function because it works like a pause for a certain period of time. For example, “0” if temporary recording is allowed
If it is prohibited, “1” can be transmitted in 1 bit. As a result, the copyright holder can manage whether or not temporary recording is possible.

Furthermore, temporary recording may be permitted for the information of Copy One Generation, and the use of this bit may be used to control whether temporary recording is possible. If this is “1” for which temporary recording is not permitted, the copy control information is rewritten as No More Copies and recorded. If it is “0” that allows temporary recording, copy control information is recorded as Copy One Generation or rewritten as No More Copies, and if it is within the time limit when played back and output. , Copy One Generation and the signal output circuit 4208 in FIG.

In either case, when “0” is recognized for temporary recording, it may be recorded as “1” by rewriting it with the recording encoding circuit 4105 of FIG. It is possible to solve the problem of being repeatedly recorded temporarily in another device within the time limit.

The time 107a is, for example, the current time at the time of broadcasting given by the management information adding circuit 16 of FIG. This may be recorded as it is as the recording time 107b, or the clock 421 in FIG.
1 may be calibrated and recorded. This recording is performed, for example, in units of sectors. For example, temporary recording of information in which the copy control information is set to Copy Never has a time limit for reproduction and viewing, but the times 107a and 107b are important in performing this management.

The broadcast system 108a includes HD information (HD; High Definition; high definition), SD information (SD
; Standard Definition; standard definition), etc., indicating the broadcasting system used by the information. This may be recorded as it is as 108b.

In the case of Copy Never information, the Pause time 109a means a time limit for playback and viewing after temporary recording. Since this is generally as short as 90 to 120 minutes, it may be inconvenient for the user. For example, if you record temporarily at midnight, you must watch it before going to bed. Therefore, if 3 bits are added as the Pause time 109a, various time settings can be made. “001” is 90 minutes, “010” is one day, “011” is one week,
“100” is one month, “101” is half a year, “110” is one year, “111” is unlimited. Thereby, the inconvenience of the user due to the short Pause time can be solved under the management of the copyright holder or the like. This may be recorded as it is as 109b. Copy One
This bit may also be used when temporary recording is allowed for generation information. After temporarily recording, the copy control information 104b remains in Copy One Generation for this period,
After the time limit has passed, rewrite as No More Copies. Alternatively, when the copy control information 104b is rewritten and recorded as No More Copies and reproduced within the time limit,
Copy One Generation is rewritten and output by the signal output circuit 4208 in FIG.

In FIG. 7B, the user identification 110 may be recorded when a user-specific code is used so that it can be reproduced only by the same device or user as when recording.

The encrypted information 111 may be used when reproducing information recorded by encryption and decrypting the encryption. When the data amount of the information itself is large, the code number may be recorded and the corresponding information stored in advance by the playback device may be extracted and used.

The user identification 110 and the encryption information 111 are added when recording. In the main embodiment of the present invention, the key for decrypting the cipher is the first and second encryption key generating circuit 41.
04, 4308, it is not always necessary to record on the recording medium.

The above is recorded at relatively fine time intervals such as every frame of video or every fixed amount of data as necessary. The configuration of the control information signal shown in FIG. 7 is an example, and various configurations such as the configuration, the recording position on the medium, and the frequency can be applied. Further, in the present invention, all of the contents are not essential, and some of them may be omitted. Of course, the order is not limited to this.

1... Information providing station 16 such as a broadcasting station... Management information giving circuits 104 a and 10
4b: Copy control 2 ... Relay station 3 ... Receiver 311 ... Control circuit 312 ... Information management circuit 4 ... First recording Reproducing apparatus 41... Recording circuit 4103... Encryption circuit 4108... Control detection circuit 4109... Recording control circuit 42. .Signal output circuit 42
10. Control detection circuit 4212 ... Reproduction control circuit 43 ... Recording / reproducing unit 4308
... Second encryption key generation circuit 5 ... Display 6 ... Second recording / reproducing device 7 ... Board

Claims (5)

  In a digital information recording / reproducing apparatus for receiving scrambled and transmitted digital information and recording / reproducing it on a recording medium,
  The digital information is accompanied by first control information and second control information,
  The first control information is information indicating at least copy prohibition of the digital information, recording of only one generation is possible, and copying is permitted.
  The second control information is information indicating whether or not temporary recording is permitted when the first control information is copy prohibited.
  Receiving means for receiving the digital information accompanied by the first control information and the second control information;
  Descrambling means for descrambling the digital information received by the receiving means;
  An encryption key generating means for generating an encryption key unique to the digital information recording / reproducing apparatus;
  Encryption means for performing encryption different from the scramble, using the encryption key unique to the digital information recording / reproducing apparatus, the digital information descrambled by the descrambling means;
  Recording means for recording the digital information encrypted by the encryption means on the recording medium;
  Reproducing means for reproducing the encrypted digital information from the recording medium;
  Decryption means for decrypting the encrypted digital information using the encryption key;
  Output means for outputting the digital information decoded by the decoding means,
  In the recording state in the recording means,
  When the first control information attached to the received digital information can be recorded for only one generation, the digital information encrypted with an encryption key unique to the digital information recording / reproducing apparatus is recorded on the recording medium. A first recording state for recording without allowing any more copies on the medium;
  The digital information encrypted with an encryption key unique to the digital information recording / reproducing apparatus when the first control information attached to the received digital information is copy-prohibited and temporary recording is permitted There is a second recording state in which information is temporarily recorded on the recording medium and the temporarily recorded digital information is reproduced and not temporarily recorded in another device. apparatus.   In a digital information receiving apparatus that receives scrambled and transmitted digital information and records / reproduces it on a recording medium,
  The digital information is accompanied by first control information and second control information,
  The first control information is information indicating at least copy prohibition of the digital information, recording of only one generation is possible, and copying is permitted.
  The second control information is information indicating whether or not temporary recording is permitted when the first control information is copy prohibited.
  Receiving means for receiving the digital information accompanied by the first control information and the second control information;
  Descrambling means for descrambling the digital information received by the receiving means;
  Recording and reproducing means for recording and reproducing the digital information descrambled by the descrambling means; and
  Output means for outputting the digital information recorded and reproduced by the recording and reproducing means,
  In the recording / reproducing output state in the recording / reproducing means and the output means,
  When the first control information attached to the received digital information is recordable for only one generation, the digital information descrambled by the descrambling means is encrypted with an encryption unique to the digital information recording / reproducing apparatus. When the recorded digital information is reproduced from the recording medium and output, the encrypted digital information is recorded with the encryption key encrypted so that no further copies are allowed on the recording medium. A first state in which the encryption is decrypted using an encryption key unique to the digital information receiving apparatus, and no further copies are allowed, and
  When the first control information attached to the received digital information is copy-prohibited and temporary recording is permitted, the digital information descrambled by the descrambling means is sent to the digital information receiving device. Encrypted using a unique encryption key, temporarily recorded on the recording medium, and when the temporarily recorded digital information is reproduced from the recording medium within the time limit of the temporary recording, the encrypted digital A digital information receiving apparatus characterized in that there is a second state in which the encryption of information is decrypted using an encryption key unique to the digital information receiving apparatus and is repeatedly output to another apparatus without being temporarily recorded. .   A digital information transmitting / receiving system for transmitting digital information from a transmitting device, receiving the transmitted digital information at a receiving device, and recording / reproducing the information on a recording medium,
  The digital information is accompanied by first control information and second control information,
  The first control information is information indicating at least copy prohibition of the digital information, recording of only one generation is possible, and copying is permitted.
  The second control information is information indicating whether or not temporary recording is permitted when the first control information is copy prohibited.
  The transmitter is
  Scrambling means for scrambling the digital information;
  Transmitting means for transmitting the scrambled digital information together with the first control information and the second control information;
  The receiving device is:
  Receiving means for receiving the digital information transmitted together with the first control information and the second control information;
  Descrambling means for descrambling the digital information received by the receiving means;
  Recording and reproducing means for recording and reproducing the digital information descrambled by the descrambling means; and
  Output means for outputting the digital information recorded and reproduced by the recording and reproducing means,
  In the recording / reproducing output state in the recording / reproducing means and the output means of the receiving device,
  When the first control information attached to the received digital information can be recorded for only one generation, the digital information descrambled by the descrambling means is stored with an encryption key unique to the receiving device. When the encrypted digital information is recorded on the recording medium without allowing further copying, and the recorded digital information is reproduced and output from the recording medium, the encrypted digital information is recorded. A first state in which the digital information is decrypted using an encryption key unique to the receiving device, and no further copies are allowed;
  When the first control information attached to the received digital information is copy-prohibited and temporary recording is permitted, the digital information descrambled by the descrambling means When the digital information is encrypted and temporarily recorded on the recording medium using an encryption key, the temporarily recorded digital information is reproduced from the recording medium within the time limit of the temporary recording. A digital information transmission / reception system comprising: a second state in which the encryption of the digital information is decrypted using an encryption key unique to the receiving device and is repeatedly output to another device without being temporarily recorded. .   In a digital information receiving method in a digital information receiving apparatus for receiving digital information transmitted by being scrambled and recording / reproducing it on a recording medium,
  The digital information is accompanied by first control information and second control information,
  The first control information is information indicating at least copy prohibition of the digital information, recording of only one generation is possible, and copying is permitted.
  The second control information is information indicating whether or not temporary recording is permitted when the first control information is copy prohibited.
  Receiving the digital information accompanied by the first control information and the second control information; and
  A descrambling step for descrambling the received digital information;
  Recording and reproducing the descrambled digital information on the recording medium, and outputting the recorded and reproduced digital information; and
  The recording / reproducing output state in the recording / reproducing output step includes the descrambled digital information when the first control information attached to the received digital information is recordable for only one generation. Encrypted with an encryption key unique to the recording / reproducing apparatus, recorded so that no more copies are allowed on the recording medium, and when the recorded digital information is reproduced and output from the recording medium, A first state in which the encrypted digital information is decrypted by using an encryption key unique to the digital information receiving device, and no further copies are allowed;
  When the first control information attached to the received digital information is copy-prohibited and temporary recording is permitted, the descrambled digital information is assigned an encryption key unique to the digital information receiving device. When the digital information temporarily recorded on the recording medium is reproduced from the recording medium within the time limit of the temporary recording, the encrypted digital information is encrypted. A digital information receiving method, characterized in that there is a second state in which decryption is performed using an encryption key unique to the information receiving device and output in a state in which the information receiving device is not repeatedly recorded temporarily.   A digital information transmitting / receiving method for transmitting digital information from a transmitting device, receiving the transmitted digital information at a receiving device, and recording / reproducing the information on a recording medium,
  The digital information is accompanied by first control information and second control information,
  The first control information is information indicating at least copy prohibition of the digital information, recording of only one generation is possible, and copying is permitted.
  The second control information is information indicating whether or not temporary recording is permitted when the first control information is copy prohibited.
  A scrambling step for scrambling the digital information;
  Transmitting the scrambled digital information together with the first control information and the second control information;
  Receiving the digital information transmitted together with the first control information and the second control information;
  A descrambling step for descrambling the received digital information;
  Recording and reproducing the descrambled digital information on the recording medium, and outputting the recorded and reproduced digital information; and
  In the recording / reproducing output state in the recording / reproducing output step,
  When the first control information attached to the received digital information is recordable for only one generation, the descrambled digital information is encrypted with an encryption key unique to the receiving device, and the recording medium When the recorded digital information is reproduced and output from the recording medium, the encrypted encryption of the digital information is unique to the receiving device. A first state of decrypting with the encryption key and outputting no more copies; and
  When the first control information attached to the received digital information is copy-prohibited and temporary recording is permitted, the descrambled digital information is transmitted using an encryption key unique to the receiving device. When the digital information is encrypted, temporarily recorded on the recording medium, and the temporarily recorded digital information is reproduced from the recording medium within the temporary recording time limit, the encrypted digital information is encrypted. A digital information transmission / reception method comprising: a second state in which decryption is performed using an encryption key unique to the reception device, and output to another device without being temporarily recorded.

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