JP4538414B2 - Digital information recording / reproducing apparatus, digital information receiving apparatus, and digital information transmitting / receiving system - 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 because the copyright owner and the creator of the information can select one of three methods: copy prohibition (Copy Never), copy authorization (Copy Free), and one-generation copy authorization (Copy One Generation). It controls the operation of the recording apparatus. 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 copying is permitted for only one generation, the recording apparatus rewrites this control information to information that disallows copying any more (No More Copies), and then performs a 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, Japanese Patent Laid-Open No. 2000-149417 discloses a method for solving this problem using a means called temporary recording even when copy control information indicates copy prohibition. 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 re-record on another recording medium on condition that the information on the original recording medium is unreproducible. 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 this is a person with a certain degree of knowledge, it can be removed from the apparatus and mounted on a PC (Personal Computer), and all information can be copied to another hard disk in 1-bit units regardless of the above-described copy control information. .

  For example, after the information that originally was Copy One Generation was recorded on the medium and became No More Copies, the premise of allowing the above-mentioned “move” operation is that the information on the original recording medium cannot be reproduced. The number of recording media is not increased. If the information that is No More Copies is recorded on the hard disk, it can be copied to another hard disk in the No More Copies state if it is removed and attached to the PC. 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, even if it was originally designed to be removable from the device, such as an optical disk such as a CD-RW or DVD-RAM, it was connected to the PC. If it is attached to a drive and copied to another recording medium in 1-bit units, the same occurs.

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 the invention described in the claims.

According to the present invention, the usability of the digital information recording / reproducing apparatus and the digital information recording / reproducing method can be improved while considering the copyright.

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. Here, when recording a broadcast or the like, it can be recorded on at least one of the first recording / reproducing apparatus 4 and the second recording / reproducing apparatus 6 in accordance with the copy control information attached thereto. The first recording / reproducing apparatus 4 is described here as being based on a digital recording system 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 given to the display 5 via the receiving apparatus 3 and the information such as the original video / 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. Reference numeral 11 denotes a source generation unit, 12 denotes an encoding circuit that performs compression by the MPEG method, 13 denotes a scramble circuit, 14 denotes a modulation circuit, 15 denotes a transmission antenna, 16 denotes a management information addition circuit, and 17 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 addition 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, there are a plurality of systems of the source generation unit 11 and the encoding circuit 12, and a multiplex for multiplexing a plurality of information between the encoding circuit 12 and the scramble circuit 13. A circuit is placed.

  FIG. 3 is a block diagram showing an example of the configuration of the receiving device 3 in the system of FIG. Reference numeral 301 denotes an RF / IF conversion circuit, 302 a demodulation circuit, 303 an error correction circuit, 304 a descrambling circuit for canceling a transmission cipher applied to the signal, 305 a first demultiplexing circuit, and 306 an input / output terminal 307 is a second demultiplexing circuit, 308 is a decoding circuit, 309 and 310 are output terminals, 311 is a control circuit for controlling the entire receiving apparatus 3, 312 is an information management circuit, 313 is a command input circuit, and 314 is Input terminal. Reference numeral 4 denotes a first recording / reproducing apparatus, which is incorporated in the receiving apparatus 3 as described in FIG. In the figure, the solid line indicates the flow of main information such as video and audio, and the dotted line indicates 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 remove information not worth recording in the first demultiplex circuit 305. In other words, additional information such as weather forecasts, program broadcast schedules, etc. is often included in the information, which is good to see at the time of broadcasting, but it is not worth recording and seeing at a later date. It can also be removed.

  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. Digital broadcasting includes HD (High Definition) information having more than 1000 scanning lines, for example, and SD (Standard Definition) information of around 500 lines. Accordingly, if the former is HD output and 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. Information on the output terminals 309 and 310 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 exchanges control signals with the components 305, 307, and 308 from the above 301, and controls the entire receiving apparatus 3 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, a recording / reproducing operation is performed in accordance with a user instruction input from the input terminal 314. 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. Reference numeral 41 denotes a recording circuit, 4101 denotes an input terminal for a signal to be recorded, 4102 denotes a storage means such as a semiconductor memory, 4103 denotes an encryption circuit, 4104 denotes a first encryption key generation circuit, 4105 denotes a recording encoding circuit, and 4106 denotes 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 an input / output terminal for a control signal, and 4111 is an output terminal for a control signal. 42 is a reproduction circuit, 4201 is a reproduction signal input terminal, 4202 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 Input terminal for second encryption key, 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, and 4213 is a control. A signal input / output terminal 4214 is 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, and 4308 is a second cipher. 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 may be combined into one 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 the 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, an example is shown in which encryption is performed based on the encryption key from the first encryption key generation circuit 4104 and the input terminal 4207 of the second encryption key. 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. When copy control information is prohibited to record, Copy Never, which means that only one generation of recording is authorized Copy One Generation, or when the latter is rewritten as No More Copies Since high security is required, encryption is often performed to limit the range of use. 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. Based on the control information from the recording control circuit 4109, the recording encoding circuit 4105 cuts off the information when recording is not performed, and when recording is performed, performs modulation suitable for the medium to be used and outputs it to the output terminal 4106. To do.

  From the recording control circuit 4109 to the recording encoding circuit 4105, in addition to the copy control information, the current time of recording output from the clock 4211 is also given. Record at the same time. 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 of the output terminal 4106 is given to the input terminal 4301 of the recording / reproducing unit 43 shown in FIG. 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. A mechanism control circuit 4306 such as a motor for driving the recording medium drive 4303 controls the recording medium by a control signal from the input terminal 4307. 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, it can be shared with the input terminal 4101 and the output terminal 4209 in accordance with the IEEE 1394 standard.

  Next, an operation when reproducing recorded information will be described. The information signal reproduced from the recording medium drive 4303 in FIG. 5 is amplified to a level that allows signal processing in the subsequent stage by the reproduction 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 4212 are usually on the same semiconductor device. In this case, the output terminals 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 and corrects it to a correct value by a calculation operation from the stored data. 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, decryption is performed using the device key of the apparatus from the first encryption key generation circuit 4207, a user key such as a personal ID, and 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. 2 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. In the second recording / reproducing apparatus 6, for example, according to the IEEE 1394 standard, information can be exchanged in a single system including information on the input terminal 4101 and the output terminal 4209, or 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 4207. Encryption is performed using both an encryption key based on an identification number (manufacturing number, etc.) unique to the hard disk drive. 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, the hard disk drive comprising the recording / reproducing unit 43 shown in FIG. 5 is removed from the recording / reproducing apparatus, mounted on the PC and copied to the second hard disk drive, and the second hard disk drive is attached to the original recording / reproducing apparatus. Even if playback is attempted, the encryption cannot be decrypted and normal viewing cannot be performed. Therefore, it is impossible to increase the number of recording media by repeatedly moving information that is No More Copies through the PC as described above. 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 can be realized by generating version information in the control circuit 311, supplying the version information to the input / output terminal 4110 in FIG. 4, and multiplexing the digital information in the recording encoding 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 detected by the control detection circuit 4210 from the reproduced information and given 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, the contents of the hard disk using the PC are not related to the contents of the copy control information and cannot be used as effective information even if copied to another hard disk, and the number of recording media can be increased by the movement operation. Disappear. 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. I 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 exchanges information with the board 7 externally attached to the receiving device 3. In FIG. 3, the version of the hard disk drive is stored in the information management circuit 312, but here, it is stored in the removable external board 7. 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. 7B shows control information that is rewritten as necessary based on the control information shown in FIG. 7A in the recording encoding circuit 4105 and is recorded on the recording medium with the contents added. Control information shown in FIG. 7B is recorded in advance in package software or the like. In FIG. 7B, the same number is assigned to the information based on the information in FIG. 7A. For example, in the case of a tape medium, it is sufficient that one piece of information shown in FIG. 7B is recorded on one recording track, but it is naturally recorded with a fixed relationship with information data such as video and audio, and can be easily reproduced. Can be separated.

  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. The copyright owner such as the creator of information selects and decides one of Copy Never (copy prohibited), Copy One Generation (copy authorization for only one generation), and Copy Free (copy authorization). 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. If 104a indicates Copy Free, it may be recorded 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 described later is permitted, it is temporarily recorded in either Copy One 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, since there are a total of four states such as Copy Never, Copy One Generation, No More Copies, and Copy Free, transmission can be performed 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), and so on.

  The APS 105a is copy control information (APS; Analogue Protection System; corresponding to an analog copy control signal) to the analog recording apparatus. This controls whether or not copying to an analog recording device is performed by adding a pseudo sync pulse to an analog video signal as described in, for example, Japanese Patent Laid-Open No. 61-288582. This may be recorded as it is as the APS 105b.

  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, if temporary recording is permitted, “0” can be transmitted, and if prohibited, “1” can be transmitted with 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 4211 in FIG. 4 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 method 108a indicates a broadcast method used by the information, such as HD information (HD; High Definition) and SD information (SD; Standard Definition). 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 six months, “110” is one year, “111” is unlimited, and so on. 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. Note that this bit may also be used when temporary recording is permitted for Copy One Generation information. After the temporary recording, the copy control information 104b remains in Copy One Generation during this period, and after the time limit has elapsed, it is rewritten as No More Copies. Alternatively, the copy control information 104b is rewritten and recorded as No More Copies, and when it is reproduced within the time limit, it is rewritten and output by Copy One Generation, the signal output circuit 4208 of 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, since the key for decrypting the cipher is generated by the first and second encryption key generating circuits 4104 and 4308, it is not necessarily recorded on the recording medium. Absent.

  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 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.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Information providing station 16 such as a broadcasting station ... Management information adding circuits 104a, 104b ... Copy control 2 ... Relay station 3 ... Receiving device 311 ··· Control circuit 312 ··· Information management circuit 4 ··· First recording / reproducing device 41 ··· Recording circuit 4103 · · · Encryption circuit 4108 · · · Control detection circuit 4109: Recording control circuit 42: Reproduction circuit 4206: Encryption / decryption circuit 4208: Signal output circuit 4210 ... Control detection circuit 4212 ... Reproduction control circuit 43 ... Recording / reproducing unit 4308... Second encryption key generating circuit 5... Display 6.

Claims (3)

In a digital information recording / reproducing apparatus for receiving 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;
An encryption key generating means for generating an encryption key unique to at least the digital information recording / reproducing apparatus;
An encryption means for encrypting the received digital information using the encryption key;
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,
The recording means may record the first control information attached to the received digital information when only one generation can be recorded, or the first control information attached to the received digital information When copying is prohibited and temporary recording is permitted, the digital information encrypted with an encryption key unique to the digital information recording / reproducing apparatus is recorded on the recording medium ,
When the first control information attached to the received digital information is copy-prohibited and temporary recording is permitted, even if the temporarily recorded digital information is reproduced, it is not repeatedly recorded temporarily to another device. A digital information recording / reproducing apparatus characterized in that the state is set . In a digital information receiving apparatus for receiving 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;
Recording / reproducing means for recording / reproducing the received digital information on the recording medium;
Output means for outputting the digital information recorded and reproduced by the recording and reproducing means,
The recording / reproducing means generates an encryption key unique to the digital information receiving device;
When the first control information attached to the received digital information can be recorded for only one generation, or the first control information attached to the received digital information is copy-prohibited and temporarily When recording is permitted, the digital information is encrypted using an encryption key unique to the digital information receiving apparatus and recorded on the recording medium,
When the digital information recorded when the first control information attached to the received digital information can be recorded for only one generation is reproduced from the recording medium and output, The digital information encryption is decrypted and output using an encryption key unique to the digital information receiving device,
When the first control information attached to the received digital information is copy-prohibited and temporary recording is permitted, the digital information temporarily recorded is reproduced from the recording medium within the time limit of the temporary recording. when the encryption of the digital information that has been encrypted is decrypted using a unique encryption key to said digital information receiving apparatus, and outputs a state which is not temporarily recorded repeatedly to other devices Digital information receiver. 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
Transmission means for transmitting the 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;
Recording / reproducing means for recording / reproducing the received digital information on the recording medium;
Output means for outputting the digital information recorded and reproduced by the recording and reproducing means,
The recording / reproducing means of the receiving device generates an encryption key unique to the receiving device,
When the first control information attached to the received digital information can be recorded for only one generation, or the first control information attached to the received digital information is copy-prohibited and temporarily When recording is permitted, the digital information is encrypted using an encryption key unique to the receiving device and recorded on the recording medium,
When the digital information recorded when the first control information attached to the received digital information can be recorded for only one generation is reproduced from the recording medium and output, The digital information encryption is decrypted and output using an encryption key unique to the receiving device,
When the first control information attached to the received digital information is copy-prohibited and temporary recording is permitted, the digital information temporarily recorded is reproduced from the recording medium within the time limit of the temporary recording. when the digital information and outputs the encryption of the digital information that has been encrypted is decrypted using a unique encryption key to the receiving device, in a state that is not temporarily recorded repeatedly to other devices Transmission / reception system.

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