JP4051689B2 - Broadcast data processing apparatus and broadcast data processing method - Google Patents

Description

  The present invention relates to a broadcast data processing apparatus and a broadcast data processing method, and is suitable for application to, for example, a digital broadcast (DVB: Digital Video Broadcast) receiver (IRD: Integrated Reciever Decoder).

  Conventionally, in this type of digital broadcasting system, video data, audio data, and the like of a plurality of channels are compressed and encoded using an MPEG2 (Moving Picture Experts Group Phase 2) system, and then each predetermined unit (for example, 184 [byte]) For each data amount) is formed into a packet (hereinafter referred to as a TS (Transport Stream) packet) and multiplexed to form a transport stream, which is converted into a digital broadcast signal, such as terrestrial, satellite or cable. It is made to transmit via.

  In such a digital broadcasting system, a receiving device extracts TS packets corresponding to a desired program from each TS packet included in a transport stream received as a digital broadcasting signal, and this is performed in accordance with a procedure reverse to the compression processing. The video data and audio data in the form of signals are decoded.

  In recent years, in such a receiving apparatus, a plurality of digital signal output terminals (hereinafter referred to as digital output terminals) are provided as output terminals for connection to an external device. That is, after the audio data obtained by decoding as described above is converted into a predetermined format, the audio data is output to an external device via an optical digital audio output terminal of IEC (International Electro-technical Committee) 958 format, or IEEE ( It has been proposed to output audio data to an external device via a high-speed serial interface called “Institute of Electrical and Electronics Engineers” 1394, or to output the transport stream itself before decoding to the external device.

  However, since the digitized video data and audio data are not deteriorated in image quality and sound quality even when copied, any number of copies without deterioration in quality can be created using a digital recording apparatus.

  For this reason, the copy management is usually performed in the digital recording device by adding predetermined copy management data (CCI: Copy Control Information) to the video data and audio data and outputting a digital signal from the digital output terminal on the receiving device side. Copy restrictions based on data are performed to prevent illegal dubbing against the copyright law.

  For example, according to the SCMS (Serial Copy Management System) method adopted in IEC 958, the copy management data includes three types of information: “Never Copy”, “Copy Once”, and “Copy Freely”. That is, “Never Copy” cannot be copied at all, “Copy Once” can be copied only once (it switches to “Never Copy” when recorded), and “Copy Freely” can be copied any number of times. It means that you can do it. In the above-described digital broadcasting system, such copy management data is added to each program and transmitted to prevent illegal dubbing contrary to the copyright law.

  However, when a digital broadcast signal to which copy management data representing “Copy Once” is added is received by a receiving apparatus provided with a plurality of digital output terminals as described above, and is recorded in the digital recording apparatus. Since digital signals are simultaneously output from a plurality of digital output terminals, when a digital recording device is connected to each of the plurality of digital output terminals, the actual copying is permitted although only one copy is permitted. Would create multiple copies at the same time.

  For this reason, a receiving apparatus provided with a plurality of digital output terminals is made to correspond to a new application that limits the number of copies, such as pay per download (a service that is charged for each download). There was a problem that became very difficult in practice.

  The present invention has been made in consideration of the above points, and an object of the present invention is to propose a broadcast data processing apparatus and a broadcast data processing method capable of reliably performing copy management.

In order to solve this problem, in the present invention, receiving means for receiving digital data and copy management data corresponding to the digital data via a broadcast wave, and outputting the received digital data to the outside in a first format. The first output means for converting the received digital data to a second format different from the first format, and the content of the copy management data is encrypted if it can be freely copied If the content of the copy restriction based on the copy management data is “do not allow copying” or “allow copying only once”, the encrypted second format data is output. Second output means for outputting to the outside, and control means for controlling operations from the first and second output means based on copy management data And the control means permits the output in the first format and the second format if the content of the copy management data is “free copy”, and “does not permit copying” or When “copy is permitted only once”, control is performed so that one of the first format and the second format is output.

According to the present invention, when a broadcast wave having digital data and copy management data corresponding to the digital data is received, if the copy management data is “can be freely copied”, the received digital data is If the copy management data is “recognize no copy” or “permit copy only once”, it is output in either the first or second format (and the first (2 format is encrypted and output), so that the digital data contained in the broadcast wave can be used more conveniently for various purposes and the copy management of the digital data is more reliably performed. An obtained data processing apparatus can be realized.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, an example of a music distribution service (EMD: Electric Music Distribution) using a digital broadcasting system will be described. However, the present invention can be applied not only to a music distribution service but also to a movie distribution service.

  In FIG. 1, reference numeral 1 denotes a digital broadcasting system 1 to which the present invention is applied as a whole. A transmitting apparatus 2 compresses and encodes a plurality of music data to be distributed by the MPEG method, and then converts the data into TS packets for each predetermined unit. In this way, a transport stream is formed by multiplexing. In addition to the music distribution service, the digital broadcasting system also compresses and encodes video and audio data of programs such as movies, dramas and news by the MPEG method, and generates a transport stream. The plurality of transport streams generated in this way are frequency-multiplexed and transmitted.

  At this time, the transmission apparatus 2 includes a TS packet describing copy management data corresponding to a predetermined format in the transport stream of the music distribution service. The copy management data is classified into a first level in which copying is not permitted, a second level in which copying is permitted only once, and a third level in which copying is permitted.

  That is, the program sent by digital satellite broadcasting includes copyright information so that the copyright is not infringed by illegal copying, and this copyright information is stored in the transport stream PMT (Program Map Table). The copyright information related to the service is inserted as two descriptors (DM_copy_control_descriptor) and (digital_copy_control_descriptor) in a form accompanying the content.

  The descriptor DM_copy_control_descriptor contains information related to analog video output, and contains analog copy guard trigger information. It also contains information on pay-per-tape (a service that is charged each time recording is performed on a recording medium such as a magnetic tape), and when the user records the tape with pay-per-tape specified content. On the other hand, the analog copy guard is removed by declaring and paying an additional fee. If you do not report, the analog copy guard will remain active.

  The descriptor called digital_copy_control_descriptor contains CGMS (Copy Generation Management System) information similar to the above-mentioned SCMS, and digital output is controlled according to the information.

  CGMS is copyright information represented by 2 bits, and the meaning of 2 bits is as follows.

In the case of “00”, copying is possible (Copy-free).
“01” is not used in CGMS.
“10” means copying once (Copy Once).
“11” is copy-prohibited (Copy-Never).

  In the present invention, output from a plurality of digital output terminals is controlled based on the description content of the above-described descriptor called digital_copy_control_descriptor.

  Thus, the transmission apparatus 2 transmits the digital broadcast signal S1 composed of the transport stream frequency-multiplexed as described above via the satellite 3, and the transmitted digital broadcast signal is given to the reception apparatus 5 via the antenna 4. .

  The receiving device 5 selects a desired frequency from the received digital broadcast signal, extracts TS packets including audio data of the desired music in the transport stream transmitted through the selected channel, and extracts these TS packets. Is decoded and sent to the speaker 6 and, if necessary, to digital recording devices 7 and 8 such as an MD (Mini Disc) recorder via a digital output terminal (not shown), respectively. It is designed to output.

  Actually, the receiving device 5 is configured as shown in FIG. 2, and when the front end unit 10 receives the digital broadcast signal S1 via the antenna 4, it is based on the channel selection command S2 sent from the control unit 11. , Frequency (frequency assigned to transponder of satellite 3) is selected. Then, for example, by performing QPSK (Quadrature Phase Shift Keying) demodulation and error correction processing, a transport stream D1 including encoded data of a desired program is output.

  Subsequently, the descrambler 12 sequentially descrambles the encrypted TS packets using the descrambling signal S3 obtained from the control unit 11, and sends the descrambled transport stream D2 to the demultiplexer 13.

  When the demultiplexer 13 receives the control signal S4 corresponding to the program designated by the user from the control unit 11, the TS packet D3 including the audio data of the designated program out of the transport stream D2 obtained from the descrambler 12. After the TS packet D4 including the copy management data is extracted, the TS packet D3 is sent to the audio decoder 14 and the TS packet D4 is sent to the control unit 11. When the selected program is a movie, drama, news, etc., TS packets including video data are also extracted and supplied to a video decoder (not shown).

  The audio decoder 14 decodes the audio data D5 included in the extracted TS packet based on the control signal S5 obtained from the control unit 11, and then converts the decoded data into a D / A (Digital / Analog) conversion unit 15 and a switch 16 Are sent to the input terminal 16A and the input terminal 17A of the switch 17.

  The D / A converter 15 converts the obtained audio data D5 from analog to analog, and sends the analog audio signal S6 to the externally connected speaker 6 (FIG. 1) via the analog output terminal 18. As a result, a sound based on the analog sound signal S6 is emitted from the speaker 6.

On the other hand, the control unit 11 _{extracts the} copy management data D _CCI included in the supplied TS packet D4, and the copy management data D _CCI is a first level at which copying is not permitted, and a second level at which copying is permitted only once. Or a third level that can be freely copied, and then, switching signals S7 and S8 are sent to the switches 16 and 17, respectively, according to the determination result.

At this time the control unit 11, the restored copy control data D _CCI is to be connected to both turned on the switches 16 and 17 only if it is determined that the third level, whereas, the copy management data D _CCI is first When it is determined that the level is the first or second level, only one of the switches 16 and 17 designated by the user is connected to the on state.

  When the switch 16 is in the on state and the switch 17 is in the off state, the audio data D5 output from the audio decoder 14 is supplied to the first format processing unit 19. The first format processing unit 19 converts the audio data D5 into a predetermined format according to, for example, IEC958, and then sends the audio data D5 to the first information adding unit 21 as the first audio data D6.

The first information adding unit 21 adds copy management data _DCCI to the first audio data D6, and then sends it to the digital recording device 7 (FIG. 1) connected externally via the digital output terminal 22. To do.

  On the other hand, when the switch 16 is in the off state and the switch 17 is in the on state, the audio data D5 output from the audio decoder 14 is given to the second format processing unit 20. The second format processing unit 20 converts the audio data D5 into a predetermined format according to, for example, IEEE 1394, and then sends the audio data D5 to the second information adding unit 23 as the second audio data D7.

The second information adding unit 23 adds the copy management data D _CCI to the second audio data D7, and the second audio data only when the copy management data D _CCI represents the first or second level. After D7 is encrypted, it is sent to the externally connected digital recording device 8 (FIG. 1) via the digital output terminal 24. This encryption is performed from the viewpoint of protecting copyrights when digital content data such as audio and video is transmitted on IEEE 1394, and is based on a standard called 5CDTCP.

Thus, the first or second audio data D6, D7 to which the copy management data D _CCI is added is supplied to either the digital recording device 7 or 8 designated by the user. Thus, also in the digital recording device 7 or 8, the first or second audio data D6, D7 is stored in a predetermined recording medium (not shown) in a state where the copy restriction is made according to the level of the copy management data _DCCI. It can be recorded.

In the above configuration, in the receiving device 5, when it is determined that the audio data D5 of the program designated by the user is copy-prohibited or can be copied only once based on the copy management data _DCCI , two digital The first or second audio data D6, D7 is output to any one of the output terminals 22, 24 specified by the user.

In this way, the receiving apparatus 5 receives the first or second audio data D6, D7 to which the copy management data D _CCI is added only to one of the digital recording devices 7 or 8 designated by the user. Can be supplied. As a result, the digital recording device 7 or 8 can also perform copy restrictions based on the copy management data D _CCI .

According to the above configuration, in the receiving device 5, only when there is a copy restriction based on the copy management data D _CCI , only one of the digital output terminals 22 or 24 designated by the user is the audio data D5 (D6, D7). _Is output together with the copy management data D _CCI , copy restriction can be applied to the digital recording device 7 or 8 connected to the digital output terminal 22 or 24, and thus unlimited dubbing is executed. Can be avoided in advance.

In the above-described embodiment, the audio data D5 (D6, D7) to which the supplied predetermined copy management data D _CCI is added is converted into a plurality of formats (formats corresponding to the interfaces of IEC958 and IEEE1394). However, the present invention is not limited to this and may be converted into a format corresponding to an interface used for various other digital data.

  In the above-described embodiment, the case where the audio data D5 is applied as the supplied digital data has been described. However, the present invention is not limited to this, and various digital data such as digitized video data are widely used. Can be applied.

  Further, in the above-described embodiment, the case where the digital output terminal 22 corresponding to IEC 958 and the digital output terminal 24 corresponding to IEEE 1394 are applied as the plurality of output terminals for outputting the supplied audio data D5 has been described. However, the present invention is not limited to this, and the receiving apparatus may be provided with a plurality of digital output terminals corresponding to, for example, IEC958, or may be provided with a plurality of digital output terminals corresponding to IEEE1394.

Further, in the above-described embodiment, the case where the control unit 11 is applied as the control means for controlling the output of each output terminal according to the content of the copy restriction based on the copy management data D _CCI has been described. The important point is that the audio data D5 (D6, D7) is transmitted via only one designated digital output terminal 22 or 24 among the plurality of digital output terminals 22 and 24 when it is determined that there is a copy restriction. As long as output is possible, various other configurations may be applied as the control means.

  In this case, as a method of alternatively designating the digital output terminal, not only switching so that one of the switches 16 and 17 is connected, but also prohibiting the operation of the first format processing unit or the second format processing. Anyway.

Further, in the above-described embodiment, the copy restriction based on the copy management data D _{CCI is set} to the first level where copying is not permitted, the second level where copying is permitted once, and the third level where copying is allowed freely. Although the case of classification into levels has been described, the present invention is not limited to this, and a level that allows multiple copies (more than once) is provided between the second level and the third level as necessary. May be.

  Further, in the above-described embodiment, the case where the data processing apparatus in the present invention is applied to digital satellite broadcasting using the satellite 3 has been described. However, the present invention is not limited to this, and digital terrestrial broadcasting, CATV (Cable It can be widely applied to various broadcasts such as television broadcasts.

  Further, in the above-described embodiment, the case where the MD recorder is applied as the digital recording equipment 7 and 8 connected to the digital output terminals 22 and 24 provided in the receiving device 5 has been described. The present invention is not limited to this, and can be widely applied to recording devices capable of recording various digital data such as rewritable optical disk devices and digital VTRs.

  INDUSTRIAL APPLICABILITY The present invention can be used for a broadcast data processing apparatus and a broadcast data processing method that externally output digital data to which predetermined management data to be supplied is added via a plurality of output systems.

It is a basic diagram which shows the structure of the digital broadcasting system by this Embodiment. It is a block diagram which shows the structure of the receiver by this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Digital broadcasting system, 2 ... Transmitting device, 3 ... Communication satellite, 4 ... Antenna, 5 ... Receiving device, 6 ... Speaker, 7, 8 ... Digital recording equipment, 10 ... Front end part , 11... CPU, 12... Descrambler, 13... Demultiplexer, 14... Audio decoder, 16, 17. , 21... First information adding unit, 23... Second information adding unit, D _CCI .

Claims (3)

Receiving means for receiving digital data and copy management data corresponding to the digital data via a broadcast wave ;
First output means for outputting the received digital data to the outside in a first format;
The received digital data is converted into a second format different from the first format, and if the content of the copy management data is “may be freely copied”, the second unencrypted Formatted data is output, and if the content of the copy restriction based on the copy management data is “copy not allowed” or “copy allowed only once”, the encrypted second format data is output to the outside. A second output means;
And control means for controlling the operation from the first and second output means based on the copy management data,
The control means includes
If the content of the copy management data is “free copy”, output in the first format and the second format is permitted, and “copy is not allowed” or “copy only once” is permitted. In the case of “recognize” , the broadcast data processing apparatus controls to output one of the first format and the second format . The broadcast data processing apparatus according to claim 1, wherein one of the output terminals of the plurality of output means is an output terminal conforming to the IEEE 1394 standard or IEC 958 standard. Digital data and copy management data corresponding to the digital data are received by the receiving means via broadcast waves,
Outputting the digital data received by the first output means to the outside in a first format;
In the second output means, the received digital data is converted into a second format different from the first format, and if the content of the copy management data is “may be freely copied”, it is encrypted. If the content of the copy restriction based on the copy management data is “not allowed to copy” or “permitted to copy once”, the encrypted second format is output. Output the data to the outside,
The control means controls the operations from the first and second output means based on the copy management data,
The control means includes
If the content of the copy management data is “free copy”, output in the first format and the second format is permitted, and “copy is not allowed” or “copy only once” is permitted. If “Yes” is selected, control is performed to output one of the first format and the second format.
A broadcast data processing method.

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