JP4665442B2 - Portable receiver, receiving method, and program - Google Patents

Description

The present invention relates to a portable receiver, a receiving method, and a program , and more particularly, to a portable receiver, a receiving method, and a program that can flexibly cope with various service forms.

  The copyright information of the program (contents) in the current digital broadcasting is inserted into the PMT (Program Specific Information) PMT (Program Map Table) of the digital copy control descriptor (digital_copy_control_descriptor) multiplexed in the transport stream Is defined as

  That is, the digital copy control descriptor is used by the right holder of the content to transmit information regarding the copy of the content to the device on the receiver side.

  FIG. 1 is a diagram showing a data structure of a digital copy control descriptor. Of the data constituting the digital copy control descriptor, “digital_recording_control_data” on the fourth line from the top of FIG. 1 and “copy_control_type” on the seventh line will be described.

  “Digital_recording_control_data” is information for controlling the copy generation as the copyright information of the content.

  When 2 bits of “digital_recording_control_data” are 00b, it indicates “copying is possible without constraint”, and when 10b is “1st generation can be copied”. If it is 11b, it indicates “copy prohibited”.

  “Copy_control_type” represents a protection mechanism. 01b and 11b are defined in this 2-bit “copy_control_type”.

  Specifically, when “copy_control_type” is 01b and “digital_recording_control_data” is other than “Copyable without restrictions” (00b), digital signals are received from the receiver via IEEE (Institute of Electrical and Electronics Engineers) 1394. When outputting, a DTCP (Digital Transmission Content Protection) encryption output process licensed by DTLA (Digital Transmission Licensing Administrator) is required.

  That is, when the first device digitally outputs content to the second device connected by IEEE1394, the first device responds to the DTCP protection information before the output. When the authentication is established, the content encrypted using the key exchanged at the time of authentication is output to the second device. In the second device, the decryption process is performed with the exchanged key, and the content is acquired.

  On the other hand, when “copy_control_type” is 11b, encrypted output is not defined. Therefore, when “digital_recording_control_data” is other than “Copyable without restriction”, IEEE1394 digital output is operationally prohibited. Yes.

  The digital copy control descriptor including such information is commonly used in current BS / broadband CS (Broadcasting Satellite / Communications Satellite) digital broadcasting and terrestrial digital broadcasting. BS / broadband CS or terrestrial digital broadcasting services are broadly divided into three categories: television broadcasting services, music (radio) broadcasting services, and data broadcasting services. The operation of has changed.

  For example, in both the BS / broadband CS digital broadcast and the terrestrial digital broadcast, it is stipulated in the operation regulations that “copy_control_type” is only 01b in the television broadcast service. Further, in the music broadcasting service and the data broadcasting service, “copy_control_type” is determined to adopt both 01b and 11b.

  Details of the digital copy control descriptor are described in “ARIB (Association of Radio Industries and Businesses) TR-B14” and “ARIB TR-B15”.

  From April 2004, digital broadcasting content can be operated from "Copyable without restrictions" to "Copyable for only one generation" at many TV broadcast stations ("digital_recording_control_data" has changed from 00b to 10b. ). At the same time, the broadcast transmission path is scrambled to protect the security, so in order to use the content, a B-CAS (trademark) card for generating a key to unscramble is used in the receiver. It must be inserted.

  Currently, both terrestrial digital broadcasting and BS digital broadcasting are targeted for reception at home television receivers or STB (Set Top Box). The user can view high-definition HD (High Definition) content for both images and audio using those devices in which a B-CAS card is inserted.

  On the other hand, one of the major merits of terrestrial digital broadcasting is that a portable broadcasting service called “one segment broadcasting” is possible. This does not require a fixed antenna installed in each home, but is intended for portable receivers such as mobile phones and PDAs (Personal Digital Assistants) that are portable and have a relatively small antenna. Is a broadcasting service.

  As a result, the user can enjoy digital broadcasting even on the go. In mobile broadcasting services, various services similar to services for home devices have been proposed. Among them, for example, content recorded in a removable memory medium built in a mobile receiver is stored in an external device. By switching to the removable memory slot, content may be viewed using the external device.

  Therefore, for such content recording and output by a portable receiver, as in the case of the above-described receiver installed in the home, a copy restriction technique is required from the viewpoint of protecting the copyright of the content. .

Patent Document 1 discloses a technology that enables a content provider to restrict the movement and pause of content by a user.
JP 2003-16725 A

  However, in the conventional operation of copyright protection, when digitally connecting a receiver and an external device, copying is restricted and scrambled broadcasting is performed at the same time.

  If the conventional operation of copyright protection is used as it is for a mobile broadcast service, a B-CAS card must be inserted in the mobile receiver in order to receive the scrambled broadcast and release the scramble. There is.

  Therefore, if the B-CAS card is indispensable in this way, naturally, a card slot is required for the portable receiver, and the size of the main unit will be larger than the current one, as well as for inserting and removing the card. By providing the mechanism, the design of the main body is greatly affected.

  In other words, the conventional operation of “digital_copy_control_descriptor” cannot substantially support new forms of services such as digitally outputting content recorded on a portable receiver to an external device while restricting copying. Therefore, a small card or a CAS (Conditional Access System) system that can restrict copying without performing scrambled broadcasting is desired.

  The present invention has been made in view of such circumstances, and is intended to flexibly support various service forms.

The portable receiver of the present invention is a portable receiver that can use a predetermined service of digital broadcasting, and includes a content and a digital copy control descriptor that is copyright information of the content transmitted together with the content. Receiving means for receiving, and the value of the generation control information included in the digital copy control descriptor together with generation control information used for copy generation control indicates that copying is possible without restriction conditions according to the that it must output the encrypted content, or value of the limiting information representing, the output is impossible for the contents when the case is a value for outputting the content, and records the content Or when the content is output to an external device, the content needs to be encrypted Determining means for determining whether, when it is determined by the determining means that there is a need to perform encryption, and encryption processing means for encrypting the content, the encrypted by the encryption processing means Processing means for recording or outputting the content or the content determined by the determination means that it is not necessary to perform encryption .

The reception method of the present invention is a reception method of a portable receiver that can use a predetermined service of digital broadcasting, and a digital copy control descriptor that is content and copyright information of the content transmitted together with the content receive bets, the included with the generation control information used to control the copy generation in the digital copy control descriptor, the value indicating that other than is possible copy without value constraints of the generation control information according to the value of the restriction information in the case where represents a, it outputs a is impossible that the must output encrypted, or the content of the content when outputting the content, when recording the content Or whether the content needs to be encrypted when the content is output to an external device To determine, when it is determined that it is necessary to perform encryption, recording or output of said encrypts the content, the content is determined that there is no need to do encrypted the content or encrypted, Includes steps.

The program of the present invention is a program for causing a computer to execute a reception process for using a predetermined service of digital broadcasting, and a digital copy control which is content and copyright information of the content transmitted together with the content The value of the generation control information included in the digital copy control descriptor, which is the copyright information of the content received together with the generation control information used for controlling the copy generation, is constrained. If the value represents something other than being able to be copied without conditions, the content must be output after being encrypted, or the content cannot be output. according to the value of the restriction information indicating a time of recording the content, Others when outputting the content to an external device, and determines whether it is necessary to encrypt the content, if it is determined that it is necessary to perform encryption, encrypts the content And causing the computer to execute a process including a step of recording or outputting the encrypted content or the content determined not to be encrypted .

In the present invention, the content and the digital copy control descriptor which is the copyright information of the content transmitted together with the content are received and the digital copy control which is the copyright information of the content transmitted together with the content is received. The content is output when the value of the generation control information included in the descriptor together with the generation control information used for controlling the generation of the copy is a value indicating that copying is possible without restriction conditions. according to the that it must output the encrypted content, or value of the limiting information representing, the output is impossible for the contents at the time of, when recording the content, or the content to an external device when outputting, whether it is necessary to perform encryption of the content is determined If it is determined that there is a need to perform encryption, the encryption of the content is performed, encrypted said content or recording or output of the content is determined that there is no need to perform encryption, it is performed .

  According to the present invention, it is possible to flexibly cope with various service forms.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 is a diagram showing a configuration example of a broadcasting system to which the present invention is applied.

  This broadcasting system basically includes a broadcasting station 1 (a transmission device 11 (FIG. 7) installed in the broadcasting station 1), a portable receiver 2, and a receiver 3.

  The broadcasting station 1 provides various services of terrestrial digital broadcasting such as a television broadcasting service and a data broadcasting service. Services provided by the broadcast station 1 include not only services for receivers installed at home, but also services for portable devices.

  These services are identified by service types described in PSI (Program Specific Information) multiplexed in a stream transmitted from the broadcasting station 1.

  The portable receiver 2 is a receiver (portable device) with a built-in tuner for terrestrial digital broadcasting that supports so-called “one-segment broadcasting”. “One-segment broadcasting” is a mobile phone or PDA (Personal Digital Assistants) that uses one segment of the 13-segment segmentation of the 6 MHz bandwidth of a conventional analog broadcasting channel. Is broadcast.

  Accordingly, by using the mobile receiver 2, the user can use a service for the mobile device provided by the broadcast station 1 from an outside location and view a television program. Further, the user of the portable receiver 2 records (copies) a content such as a television program in a memory built in the portable receiver 2 and transfers the content in a form shifted in time rather than in real time. 2 or digitally output to an external device connected to the portable receiver 2 via IEEE (Institute of Electrical and Electronics Engineers) 1394 for viewing.

  Content recording and output are performed in accordance with the description of a digital copy control descriptor (digital_copy_control_descriptor) inserted into a PSI PMT (Program Map Table), as will be described in detail later.

  In the conventional operation of the digital copy control descriptor, copying is restricted while permitting output on the assumption that DTCP copyright protection technology is adopted for digital connection between the receiver and the external device. Also, since it is necessary to protect the security of the broadcast from the broadcast station 1 by scrambled broadcast, broadcast reception cannot be realized unless a B-CAS card is inserted in the receiver. On the other hand, in the portable receiver 2, broadcast reception can be realized even if a B-CAS card is not inserted.

  The receiver 3 is a terrestrial digital broadcast receiver installed in the house H. A television receiver 4 and a fixed antenna 5 are connected to the receiver 3, and a user can use a service provided from the broadcast station 1 using the receiver 3. A B-CAS card is inserted in the receiver 3, and at the same time, the content is copied according to the description of the digital copy control descriptor specified in ARIB (Association of Radio Industries and Businesses) (for example, “ARIB TR-B10”). Recording and output can be performed.

  Here, the digital copy control descriptor will be described.

  FIG. 3 is a diagram showing an example of the data structure of a digital copy control descriptor used in the broadcasting system of FIG.

  In the conventional digital copy control descriptor, 01b and 11b are defined as 2-bit “copy_control_type” included therein. However, in the digital copy control descriptor of FIG. 3, 10b is further defined. It is different from the one. The “copy_control_type” of 10b is particularly used to restrict the recording and output of content in the mobile broadcast service.

  The 8-bit “descriptor_tag” shown in the second line from the top in the data structure of FIG. 3 is used to identify the digital copy control descriptor. The 8-bit “descriptor_length” shown in the third line represents the descriptor length of the digital copy control descriptor.

  The 2-bit “digital_recording_control_data” shown in the fourth line represents the copyright information of the content by the receiver or an external device connected thereto, and is information for controlling content copying. FIG. 4 shows the meaning of each value of “digital_recording_control_data”.

  As shown in FIG. 4, when “digital_recording_control_data” is 00b, it indicates “copying is possible without constraint”, and when it is 10b, “only one generation can be copied”. If it is 11b, it indicates “copy prohibited”. Note that 01b can be arbitrarily defined by the user.

  Returning to the description of FIG. 3, 1-bit “maximum_bit_rate_flag” shown in the fifth line indicates whether or not to describe the maximum transmission rate of the service. When “maximum_bit_rate_flag” is 0, it indicates that the maximum transmission rate is not described, and when it is 1, it indicates that the maximum transmission rate is described.

  When the value of 1-bit “component_control_flag” shown in the sixth line is 0, the digital copy control information is defined for the entire program, and indicates that there is no field after the component control length. This flag is not used when the descriptor is described in the PMT.

  The 2-bit “copy_control_type” shown in the seventh line represents a protection mechanism. FIG. 5 shows the meaning of each value of “copy_control_type”.

  As shown in FIG. 5, when “copy_control_type” is 01b, it means that when “digital_recording_control_data” is other than “copy possible without constraint” (00b), the receiver IEEE1394 digital output has DTLA (Digital This means that DTCP (Digital Transmission Content Protection) encryption output processing licensed by Transmission Licensing Administrator is required.

  When “copy_control_type” is 11b, it indicates that IEEE1394 digital output is not possible when “digital_recording_control_data” is other than “Copyable without constraint”.

  Further, when “copy_control_type” is 10b (when “if (copy_control_type = 10)” shown in the eighth line of FIG. 3 is satisfied), it refers to the 2-bit “security_type” shown in the ninth line of FIG. In this case, the content is recorded and output according to the setting.

  This point differs from the digital copy control descriptor of FIG. 1 in that 10b of “copy_control_type” is used and that “security_type” is defined. Naturally, as the value of “copy_control_type” for referring to “security_type”, 00b which is not used in other services may be used as in 10b.

  The meaning of each value of “security_type” is shown in FIG. Note that “security_type” is a name given for convenience, and any name may be used as long as it can represent restrictions on recording and output of content in the same way as “security_type”.

  As shown in FIG. 6, when “security_type” is 00b, it means “no security is required for digital recording and digital output”, and when 01b is “security_type” is “security is required for digital recording and digital output” " Here, security refers to the above-described DTCP encryption output processing and the like.

  Further, when “security_type” is 10b, it indicates that “only built-in security recording is possible. Digital output is not possible”. 11b is “resesrved_future_use” and is used for future expansion.

  In this way, by newly defining “security_type”, setting “copy_control_type” to 10b, and setting “security_type” to 00b, if “digital_recording_control_data” is other than 00b, scramble output must be performed. When digital output cannot be performed and content is recorded, it is possible to perform digital recording and digital output while avoiding the need for security recording. In broadcasting, security is improved by scrambling.

  Therefore, for example, the content can be digitally output from the portable receiver 2 to an externally connected device, and broadcast reception can be performed without a B-CAS card.

  Note that the “security_type” 10b can be used for so-called server-type broadcasting in which content is recorded on a recording medium built in the receiver and the content can be used later. Further, when “security_type” is 11b (undefined), it is also possible to treat the reserved bits for future expansion in the same manner as 01b of “security_type”.

  In this way, it is possible to independently limit the recording of content on the built-in recording medium and the security of digital output to external devices, thereby widening the range of content handling on the receiver side. Is possible. That is, the broadcast station 1 can provide various services.

  In the above, the handling of digital signals has been described, but for analog output from the receiver, the same operation as the conventional regulation is imposed (following the value of “APS_control_data” in FIG. 1), and the digital content As with handling, it is possible to impose another operation.

  The processing of the transmitter 11 of the broadcast station 1 that restricts recording or output of content using the digital copy control descriptor as described above and the processing of the portable receiver 2 will be described later with reference to flowcharts.

  FIG. 7 is a block diagram illustrating a configuration example of the transmission device 11.

  The control unit 21 controls the overall operation of the transmission device 11 according to a predetermined program. For example, the control unit 21 controls the encoders 22-1 to 22-n to perform encoding processing and compression processing of video signals and audio signals of television programs, and packet encoders 23-1 to 23-n. To control the packetization of the outputs of the encoders 22-1 to 22-n. In addition, the control unit 21 generates a PSI such as a PMT including a digital copy control descriptor, and outputs additional information such as the generated PSI to the multiplexing unit 24.

  The encoders 22-1 to 22-n encode video signals and audio signals supplied from a supply unit (not shown) and, for example, MPEG-AVC / H.264 (Moving Picture Experts Group-Advanced Video Coding / H.264) is performed, and the obtained data is output to the packet encoders 23-1 to 23-n.

  The packet encoders 23-1 to 23-n perform packetization processing on the video data and audio data supplied from the encoders 22-1 to 22-n, respectively, and the obtained packets are multiplexed by the multiplexing unit 24. Output to.

  The multiplexing unit 24 multiplexes the packets supplied from the packet encoders 23-1 to 23-n and the additional information supplied from the control unit 21, and outputs the obtained stream to the digital modulation circuit 25. The multiplexing unit 24 also scrambles content as necessary. Note that the PSI of additional information supplied from the control unit 21 includes PAT (Program Association Table), NIT (Network Information Table), and CAT (Conditional Access Table) in addition to PMT.

  The digital modulation circuit 25 performs digital modulation processing on the stream supplied from the multiplexing unit 24 and transmits the obtained broadcast signal from the antenna 26.

  FIG. 8 is a block diagram illustrating a functional configuration example of the control unit 21. At least a part of the configuration of FIG. 8 is realized by executing a predetermined program by the control unit 21.

  The control unit 21 includes a digital copy control information setting unit 41, a copy control type setting unit 42, and a security type setting unit 43. The digital copy control information setting unit 41, the copy control type setting unit 42, and the security type setting unit 43 are supplied with control information input by an administrator of the transmission apparatus 11, and based on this control information, the respective information Is set.

  The digital copy control information setting unit 41 sets “digital_recording_control_data” (FIG. 4) of the digital copy control descriptor based on the control information.

  That is, the digital copy control information setting unit 41 is supplied with the digital copy control descriptor having the structure shown in FIG. The digital copy control descriptor supplied to the digital copy control information setting unit 41 is one in which the values of “digital_recording_control_data”, “copy_control_type”, and “security_type” have not been set yet.

  The digital copy control descriptor in which “digital_recording_control_data” is set by the digital copy control information setting unit 41 is output to the copy control type setting unit 42.

  The copy control type setting unit 42 sets “copy_control_type” (FIG. 5) of the digital copy control descriptor based on the control information. The digital copy control descriptor in which “copy_control_type” is set by the copy control type setting unit 42 is output to the security type setting unit 43.

  The security type setting unit 43 sets “security_type” (FIG. 6) of the digital copy control descriptor based on the control information. The digital copy control descriptor in which “security_type” is set by the security type setting unit 43 is output to the multiplexing unit 24 together with other PSI.

  FIG. 9 is a block diagram illustrating a configuration example of the mobile receiver 2 of FIG.

  A CPU (Central Processing Unit) 51 executes a predetermined program stored in a ROM (Read Only Memory) or a memory 53 (not shown), and controls the overall operation of the portable receiver 2 via the bus 52. . For example, the CPU 51 analyzes the PSI supplied from the B / E (Back End) unit 56 via the bus 52, determines the service type of the selected channel, analyzes the digital copy control descriptor, etc. I do.

  The content supplied from the B / E unit 56 is recorded in a memory 53 such as a flash memory, and the recorded content is read by the B / E unit 56 as necessary. Content recording to the memory 53 is performed according to the description of the digital copy control descriptor.

  An F / E (Front / End) unit 55 performs processing such as channel selection of a broadcast signal received by the antenna 54, processing for demodulating a modulated signal, and error correction in accordance with control by the CPU 51. The stream is output to the B / E unit 56.

  The B / E unit 56 performs processing for separating packets from the stream supplied from the F / E unit 55, decoding processing, and the like according to control by the CPU 51. The video data acquired by the B / E unit 56 is output to, for example, an LCD (Liquid Crystal Display) 57, and an image of the content is displayed. Thereby, the user can view the program. Note that the audio data acquired by the B / E unit 56 is converted into an analog signal and then output from a speaker or an earphone terminal (not shown). The data acquired by the B / E unit 56 is also output to the output unit 58 as necessary.

  Further, the B / E unit 56 outputs additional information such as PSI included in the stream supplied from the F / E unit 55 to the CPU 51 via the bus 52.

  The output unit 58 is a digital output terminal such as IEEE1394, for example, and digitally outputs content (video data, audio data) supplied from the B / E unit 56 to an external device connected via an IEEE1394 cable. To do. Digital output from the output unit 58 to an external device is also performed according to the description of the digital copy control descriptor.

  FIG. 10 is a block diagram illustrating a functional configuration example of the mobile receiver 2 of FIG. At least a part of the configuration in FIG. 10 is realized by the CPU 51 executing a predetermined program.

  The service type determination unit 71 refers to the NIT included in the PSI supplied from the B / E unit 56 and determines the service provided by the channel selected by the F / E unit 55. The NIT service list descriptor describes a service type for identifying each service such as a television broadcast service, a music broadcast service, and a data broadcast service. The determination result by the service type determination unit 71 is output to the digital copy control descriptor analysis unit 72.

  The digital copy control descriptor analysis unit 72 analyzes the digital copy control descriptor included in the PMT supplied from the B / E unit 56 with reference to the service determination result by the service type determination unit 71.

  For example, when the service type determination unit 71 determines that the selected service is a mobile broadcast service, the digital copy control descriptor analysis unit 72 uses “security_type” in addition to “digital_recording_control_data” and “copy_control_type”. Analysis is also performed. The analysis result of the digital copy control descriptor by the digital copy control descriptor analysis unit 72 is output to the recording / output control unit 73.

  The recording / output control unit 73 controls content recording and output by the B / E unit 56 according to the analysis result by the digital copy control descriptor analysis unit 72.

  Next, operations of the transmission device 11 and the portable receiver 2 having the above-described configurations will be described.

  First, the transmission processing of the transmission device 11 will be described with reference to the flowchart of FIG.

  The digital copy control information setting unit 41 (FIG. 8) of the control unit 21 sets “digital_recording_control_data” of the digital copy control descriptor based on the control information input by the administrator of the transmission apparatus 11 or the like.

  That is, the digital copy control information setting unit 41 sets 00b to “digital_recording_control_data” when the content to be transmitted can be “copied without constraint”, and 10b when “only one generation can be copied” To do. Also, the digital copy control information setting unit 41 sets 11b to “digital_recording_control_data” when “copying prohibited” is set.

  The digital copy control descriptor in which “digital_recording_control_data” is set by the digital copy control information setting unit 41 is output to the copy control type setting unit 42.

  In step S2, the copy control type setting unit 42 sets “copy_control_type” of the digital copy control descriptor based on the control information.

  For example, when the “digital_recording_control_data” set by the digital copy control information setting unit 41 is other than “copy possible without restriction” (00b), the copy control type setting unit 42 outputs an encrypted output to the digital output of the receiver. When requesting the process, set 01b to “copy_control_type”.

  Further, when transmitting the content of the mobile broadcast service, the copy control type setting unit 42 sets 10b to “copy_control_type” as appropriate. Thereby, in the portable receiver 2, digital recording and digital output of content are restricted according to "security_type".

  The digital copy control descriptor in which “copy_control_type” is set by the copy control type setting unit 42 is output to the security type setting unit 43.

  In step S3, the security type setting unit 43 sets “security_type” of the digital copy control descriptor based on the control information.

  That is, the security type setting unit 43 sets 00b to “security_type” when the content to be transmitted does not require security during digital recording or digital output, and sets 01b when required. Also, the security type setting unit 43 sets 10b to “security_type” when the content is handled as “only built-in security recording is possible. Digital output is not possible”.

  The digital copy control descriptor in which “security_type” is set by the security type setting unit 43 is output to the multiplexing unit 24 together with other PSI.

  In addition to PSI from the control unit 21, the multiplexing unit 24 is subjected to encoding processing and compression processing by encoders 22-1 to 22-n, and packetization processing is performed by packet encoders 23-1 to 23-n. Packets obtained by being applied are also supplied.

  In step S4, the multiplexing unit 24 multiplexes these packets and the PSI supplied from the control unit 21 (security type setting unit 43). The stream obtained by multiplexing by the multiplexing unit 24 is output to the digital modulation circuit 25.

  In step S <b> 5, the digital modulation circuit 25 performs digital modulation processing or the like on the stream supplied from the multiplexing unit 24 and transmits the obtained broadcast signal from the antenna 26.

  Next, the reception process of the portable receiver 2 will be described with reference to the flowchart of FIG.

  In step S <b> 11, the F / E unit 55 selects a channel in accordance with, for example, a user operation, and outputs a stream obtained by performing processing such as demodulation and error correction to the B / E unit 56. The B / E unit 56 separates packets and outputs information such as PSI to the CPU 51 (service type determination unit 71, digital copy control descriptor analysis unit 72 (FIG. 10)) via the bus 52. .

  In step S12, the service type determination unit 71 refers to the NIT service type included in the PSI supplied from the B / E unit 56, and provides the service provided by the channel selected by the F / E unit 55. It is determined whether or not is a mobile broadcast service.

  If it is determined in step S12 that the provided service is not a mobile broadcast service, the service type determination unit 71 outputs the determination result to the digital copy control descriptor analysis unit 72. At this time, the process proceeds to step S13.

  In step S13, the digital copy control descriptor analysis unit 72 performs normal recording / output control processing.

  On the other hand, when it is determined in step S12 that the service provided by the selected channel is a mobile broadcast service, the service type determination unit 71 outputs the determination result to the digital copy control descriptor analysis unit 72. .

  In step S14, the digital copy control descriptor analysis unit 72 analyzes the PSI supplied from the B / E unit 56, and determines whether or not there is a digital copy control descriptor in the PMT.

  If the digital copy control descriptor analysis unit 72 determines in step S14 that there is no digital copy control descriptor in the PMT, the digital copy control descriptor analysis unit 72 proceeds to step S15 to record the content, assuming that the received content is copy-free content. The recording / output control unit 73 performs predetermined processing such as output. That is, the B / E unit 56 is controlled by the recording / output control unit 73, and content recording to the memory 53 and content digital output from the output unit 58 are performed.

  If the digital copy control descriptor analyzing unit 72 determines in step S14 that the PMT has a digital copy control descriptor, the digital copy control descriptor analyzing unit 72 analyzes “copy_control_type” of the digital copy control descriptor.

  In step S <b> 16, when the digital copy control descriptor analysis unit 72 determines that “copy_control_type” is 01b or 11b, the digital copy control descriptor analysis unit 72 outputs the determination result to the recording / output control unit 73. At this time, the process proceeds to step S13.

  In step S13, the digital copy control descriptor analysis unit 72 performs normal recording / output control processing. That is, when “copy_control_type” is 01b and the “digital_recording_control_data” is other than “copy possible without restriction” (00b), the digital copy control descriptor analysis unit 72 performs recording / output control during digital output. The unit 73 is caused to perform encryption output processing on the IEEE1394 digital output. Further, when “copy_control_type” is 11b, the digital copy control descriptor analysis unit 72 prohibits the IEEE1394 digital output to the recording / output control unit 73 when “digital_recording_control_data” is other than “copying without restriction”. Let

  On the other hand, if the digital copy control descriptor analysis unit 72 determines that “copy_control_type” is 10b in step S16, the process proceeds to step S17, and “digital_recording_control_data” is 00b (“copying possible without restriction”). It is determined whether or not.

  If it is determined in step S17 that “digital_recording_control_data” is 00b, the digital copy control descriptor analysis unit 72 proceeds to step S15, and determines that the received content is copy-free content to the recording / output control unit 73. A predetermined process is performed.

  If the digital copy control descriptor analyzing unit 72 determines in step S17 that “digital_recording_control_data” is not 00b, the digital copy control descriptor analyzing unit 72 proceeds to step S18 and determines “security_type”.

  In step S <b> 18, when the digital copy control descriptor analysis unit 72 determines that “security_type” is 10 b, the determination result is output to the recording / output control unit 73. At this time, the process proceeds to step S19.

  In step S19, the recording / output control unit 73 treats the received content as “only built-in security recording is possible. Digital output is not possible”. Thereby, for example, the content acquired by the B / E unit 56 is supplied to the memory 53 and recorded. In this description, it is assumed that data is recorded in the memory 53, but it is also possible to record on a removable recording medium capable of security recording, such as a device built-in HDD recording device, a device built-in memory stick (trademark), or the like.

  On the other hand, if it is determined in step S18 that “security_type” is 01b, the digital copy control descriptor analysis unit 72 outputs the determination result to the recording / output control unit 73. At this time, the process proceeds to step S20.

  In step S20, the recording / output control unit 73 handles the received content as “security is required for digital recording and digital output”. Thus, for example, when content is output to an external device connected via the output unit 58, encryption output processing or the like is performed with the device.

  In step S <b> 18, when the digital copy control descriptor analysis unit 72 determines that “security_type” is 00b, the digital copy control descriptor analysis unit 72 outputs the determination result to the recording / output control unit 73. At this time, the process proceeds to step S21.

  In step S21, the recording / output control unit 73 handles the received content as “security is not required for digital recording and digital output”. Thereby, for example, when content is output to an external device connected via the output unit 58, the content is output to the external device without performing encryption output processing or the like.

  As described above, 10b of “copy_control_type” is newly used, and “security_type” is referred to the portable receiver 2, thereby making it possible to correspond to various types of services and having an appropriate copyright. Management can be achieved.

  In the above, the case where the above-described function is realized by newly using “copy_control_type” 10b and corresponding to a new service has been described. However, the existing “digital_copy_control_descriptor” is not changed, and a new service is provided. It is also possible to achieve this by adding provisions that are only valid for it.

  For example, when “copy_control_type” is 01b, the device that has analyzed the content handles the content as equivalent to “security is required for digital recording and digital output”, which means 01b of “security_type”. When "copy_control_type" is 11b, the conventional "digital_copy_control_descriptor" is changed by treating the content as equivalent to "security is not required for digital recording and digital output" meaning 00b of "security_type" Without having to do so, it can flexibly handle new services.

  The reception process of the portable receiver 2 when adding a function without changing the conventional “digital_copy_control_descriptor” will be described with reference to the flowchart of FIG. 13.

  The processing in steps S31 to S34 is the same as the processing in steps S11 to S14 in FIG. That is, when the F / E unit 55 selects a channel in step S31 and the service type determination unit 71 determines in step S32 that the service provided on the received channel is a mobile broadcast service, The process proceeds to step S34.

  If it is determined in step S34 that the digital copy control descriptor analysis unit 72 has a digital copy control descriptor in the PMT, the process proceeds to step S36.

  In step S36, the digital copy control descriptor analyzing unit 72 analyzes the “copy_control_type” of the digital copy control descriptor, and when it is determined that “copy_control_type” is 01b, the process proceeds to step S37, where “digital recording and digital output” To handle the received content.

  That is, the digital copy control descriptor analyzing unit 72 replaces 01b of “copy_control_type” with 01b of “security_type”.

  In step S36, if the digital copy control descriptor analysis unit 72 determines that “copy_control_type” of the digital copy control descriptor is 11b, the process proceeds to step S38, and “security is not required for digital recording and digital output. ", The received content is handled.

  That is, the digital copy control descriptor analysis unit 72 replaces 11b of “copy_control_type” as 00b of “security_type”.

  By performing such replacement, it is possible to flexibly support a new service with the conventional “digital_copy_control_descriptor”. The above-described reading may be made possible by installing a program that specifies a reading method for a receiver capable of analyzing the conventional “digital_copy_control_descriptor”.

  In the above, the case where the function of the mobile broadcast service is added has been described. Similarly, the function of the receiver 3 installed in the house H is added by using 10b of “copy_control_type” and “security_type”, and a new It may be made to correspond to various services.

  Further, in the above, the meaning of “security_type” is shown in FIG. 6, but naturally, various other meanings can be given depending on the service.

  The series of processes described above can be executed by hardware, but can also be executed by software. In this case, the apparatus for executing the software is constituted by, for example, a personal computer as shown in FIG.

  In FIG. 14, the CPU 71 executes various processes according to a program stored in the ROM 72 or a program loaded from a storage unit 78 into a RAM (Random Access Memory) 73. The RAM 73 also appropriately stores data necessary for the CPU 71 to execute various processes.

  The CPU 71, ROM 72, and RAM 73 are connected to each other via a bus 74. An input / output interface 75 is also connected to the bus 74.

  Connected to the input / output interface 75 are an input unit 76 such as a keyboard and a mouse, an output unit 77 composed of an LCD, a storage unit 78 composed of a hard disk, and a communication unit 79 that performs communication processing via a network. ing.

  A drive 80 is connected to the input / output interface 75 as necessary, and a removable medium 81 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory is appropriately mounted, and a computer program read from the medium is required. Is installed in the storage unit 78 according to the above.

  When a series of processing is executed by software, the programs that make up the software can execute various functions by installing a computer that is built in dedicated hardware or various programs. For example, it is installed on a general-purpose personal computer from a network or a recording medium.

  As shown in FIG. 14, the recording medium is distributed to provide a program to the user separately from the apparatus main body, and includes a magnetic disk (including a flexible disk) on which the program is recorded, an optical disk (CD- ROM (Compact Disk-Read Only Memory), DVD (including Digital Versatile Disk)), magneto-optical disk (including MD (registered trademark) (Mini-Disk)), or removable media 81 made of semiconductor memory, etc. In addition, it is configured by a ROM 72 on which a program is recorded and a hard disk included in the storage unit 78 provided to the user in a state of being pre-installed in the apparatus main body. When the digital broadcast receiving function is realized by a computer, it is necessary to pay sufficient attention so that broadcast contents and security information cannot be easily taken out in accordance with the implementation standard defined in the operation regulations in addition to the above.

  In the present specification, each step includes not only processing performed in time series according to the described order but also processing executed in parallel or individually, although not necessarily performed in time series.

  Further, in this specification, the system represents the entire apparatus constituted by a plurality of apparatuses.

It is a figure which shows the data structure of the conventional digital copy control descriptor. It is a figure which shows the structural example of the broadcast system to which this invention is applied. It is a figure which shows the example of the data structure of the digital copy control descriptor used with the broadcasting system of FIG. It is a figure which shows the meaning of digital_recording_control_data. It is a figure which shows the meaning of copy_control_type. It is a figure which shows the meaning of security_type. It is a block diagram which shows the structural example of a transmitter. It is a block diagram which shows the function structural example of the control part of FIG. It is a block diagram which shows the structural example of a portable receiver. It is a block diagram which shows the function structural example of the portable receiver of FIG. It is a flowchart explaining the transmission process of a transmitter. It is a flowchart explaining the reception process of a portable receiver. It is a flowchart explaining the other receiving process of a portable receiver. And FIG. 16 is a block diagram illustrating a configuration example of a personal computer.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Broadcasting station, 2 Portable receiver, 3 Receiver, 21 Control part, 41 Digital copy control information setting part, 42 Copy control type setting part, 43 Security type setting part, 51 CPU, 53 Memory, 55 F / E part, 56 B / E section, 58 output section, 71 service type determination section, 72 digital copy control descriptor analysis section, 73 recording / output control section

Claims (3)

In a portable receiver that can use a predetermined service of digital broadcasting,
Receiving means for receiving the content and a digital copy control descriptor that is copyright information of the content transmitted together with the content;
When the value of the generation control information included in the digital copy control descriptor together with the generation control information used for controlling the copy generation is a value indicating that copying is possible without restriction conditions it must output by encrypting the content at the time of outputting the content, or the output of the content is impossible, according to the value of the restriction information indicating a time of recording the content, or the content A determination means for determining whether or not the content needs to be encrypted when outputting to an external device ;
An encryption processing means for encrypting the content when the determination means determines that it is necessary to perform encryption;
And processing means for recording or output of the encrypted the contents or the content that is determined by the determining means and there is no need to perform encryption by the encryption processing means
A portable receiver comprising: In a receiving method of a portable receiver that can use a predetermined service of digital broadcasting,
Receiving a content and a digital copy control descriptor which is copyright information of the content transmitted together with the content;
When the value of the generation control information included in the digital copy control descriptor together with generation control information used for copy generation control is a value indicating that copying is possible without restriction conditions it must output by encrypting the content at the time of outputting the content, or the output of the content is impossible, according to the value of the restriction information indicating a time of recording the content, or the content When outputting to an external device, determine whether the content needs to be encrypted ,
If it is determined that encryption is necessary, the content is encrypted,
Recording or output of the content is determined that there is no need to perform the content or encrypted, encrypted
A receiving method including steps . In a program for causing a computer to execute reception processing for using a predetermined service of digital broadcasting,
Receiving a content and a digital copy control descriptor which is copyright information of the content transmitted together with the content;
When the value of the generation control information included in the digital copy control descriptor together with generation control information used for copy generation control is a value indicating that copying is possible without restriction conditions it must output by encrypting the content at the time of outputting the content, or the output of the content is impossible, according to the value of the restriction information indicating a time of recording the content, or the content When outputting to an external device, determine whether the content needs to be encrypted ,
If it is determined that encryption is necessary, the content is encrypted,
Recording or output of the content is determined that there is no need to perform the content or encrypted, encrypted
A program that causes a computer to execute processing including steps .

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