JP2000032424A - Data transmission system and data receiving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect respective contents, even when a plurality of contents are in existence in one event by controlling the receiver side so that a status denoting purchase of contents data is stored and purchase of the contents is inhibited, when it is decided that the contents data have already been purchased. SOLUTION: In a music content distribution system, when a viewer desires confirmation of downloaded music, the viewer depresses a recording history button to display a list of music programs that have already been downloaded on an entire screen. In this reception installation 3, the music list is displayed on a GUI picture of a television receiver 14. Then a desired music can be listened for trial by selecting the music according to the display on GUI picture. Moreover, download and reservation of music, and display of download history and a list of reserved music programs or the like are executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a data transmission system and a data receiving apparatus suitable for a system for performing music broadcasting by digital satellite broadcasting, and more particularly to protection of data provided as contents.

[0002]

2. Description of the Related Art Digital satellite broadcasting has been widely used. Digital satellite broadcasting is more resistant to noise than conventional analog broadcasting and can transmit high-quality signals. Further, the frequency use efficiency is improved, and the number of channels can be increased. For example, in digital satellite broadcasting, one satellite can secure several hundred channels. In such digital satellite broadcasting, a large number of specialized channels for sports, movies, music, news, etc. are prepared, and programs of respective specialized contents are broadcasted on these specialized channels.

[0003] Among these specialty channels, the music channel is one of the popular channels, and a promotion program mainly for introducing new songs and hit songs is broadcast.

[0004] In a conventional music channel, a program of a new song or a hit song is transmitted as a moving image and a sound. Viewers
If there is a favorite song while watching such a music channel, the user may want to purchase a CD (Compact Disc) of the introduced song and enjoy the song. Further, there are times when it is desired to know the information of the artist of the music or the information of the album in which the music is stored. If you are watching a music program and want to know the artist information of the song or the information of the album that contains the song, you can get the information on the spot, and if you find a song you like, It would be very convenient to be able to download the audio data.

[0005] However, in a conventional music channel, a moving image and a sound related to a music are transmitted unilaterally.
Such a request cannot be met.

In order to solve such a problem, information on music broadcast on a music channel can be easily obtained, and the music data can be easily downloaded to a data storage device. A music content distribution system has been proposed.

[0007] In such a music content distribution system, in order to protect the rights of the author, it is necessary to charge the content and charge the data when downloading the music data.

In a digital satellite broadcasting system, FIG.
The charging system shown in FIG. It is conceivable to use such a billing system in a music content distribution system.

FIG. 11 shows a billing system used in a digital satellite broadcasting system. FIG.
In, the video signal and the audio signal are compression-encoded by the encoder 111 of the transmission side 101. Encoder 111
The video signal and the audio signal that have been compression-encoded are sent to the multiplexer 112.

[0010] In the multiplexer 112, the encoder 11
1 and an EMM (Entitlement Manageme) from the scramble control system.
nt Message) ECM from data and related information sending device
(Entitlement Control Message) data is multiplexed. The multiplexed signal is scrambled by the scrambler 113 using the key Ks from the related information transmitting device 114, and transmitted to the transmission path.

[0011] Encoder 111 and related information sending device 1
14 is controlled by the program control system 115.
The scramble control system 133 stores all contractor information (card ID, individual key, contract type, etc.), generates a work key Kw using the individual key of each contractor, 114. Further, the scramble control system 133 supplies the contract information to the viewing information collection system 135.

The signal transmitted via the transmission path is descrambled by the receiver 102 and decoded to restore the original video and audio signals.

The receiver 102 has a slot into which an IC card 136 is inserted. This IC card 13
6 and the receiver 102 are configured to be able to communicate with each other. The IC card 136 is shipped with the individual key and card ID of each contractor stored and used when charging and descrambling are performed.

As a billing form, there are a flat type contract and a PPV (Pay Per View) type contract. In PPV, the viewing history of a PPV program watched within a certain period is
It is stored in the nonvolatile memory in the C card 136. The viewing history data stored within a certain period is uploaded to the viewing information collection processing system 135 via the modem 117 in the receiver 102 and the telephone line. In this way, a viewing fee is charged to the subscriber's house from the broadcast music.

FIG. 12 shows a descrambling process in the receiver 102. The ECM and EMM sent from the transmission side are input to the descrambler.

First, using the individual key stored in the IC card 136, the first decryption circuit 121
The encrypted work key Kw in the MM is decrypted. Further, in the second decryption circuit 122, the encrypted scramble key Ks in the ECM is decrypted using the decrypted work key Kw.

The signal selected by the tuner, demodulated and error-corrected is supplied to a descrambler 123. The descrambler 123 decrypts the scrambled video and audio signals using the scramble key Ks.

EMM data is not transmitted frequently, but is transmitted only during a specific period, such as when a new contract or a contract is changed. The receiver 102 takes in the EMM data that matches the card ID stored in the IC card 136 and stores it in the EEPROM in the IC card 136. The EMM data includes data such as contract type, PPV program purchase upper limit, SMS call date and time, SM call amount, and the like, and a billing process is performed based on these data.

[0019]

In the digital satellite broadcasting, there is a contract of the PPV system as described above. In the PPV system, when the content is viewed, the information is transmitted for each event corresponding to the content. The information is recorded on an IC card, and the information of the IC card is sent to a charging server via a telephone line at predetermined intervals, and charging is performed. In the music content distribution system, it is conceivable to perform charging by the above-mentioned PPV method. In other words, it is conceivable to consider one song as one content and charge each time one song is received.

However, the conventional PPV system handles contents having a relatively long time, such as movie programs. In the case of such long-time content, one content can be processed in response to one event. However, in the case of short-time content such as music data, if one content corresponds to one event, the number of events becomes enormous. However, there is a danger that information will overflow in the current charging IC card, and the charging information cannot be managed.

Therefore, it is conceivable to broadcast the same music a plurality of times, and treat contents corresponding to the music data of the plurality of times as one event. If a plurality of contents are regarded as one event, the number of events will not be enormous.

However, in the PPV system, since one event is a unit of encryption, if a plurality of contents are handled as one event, all the plurality of contents in one event will be descrambled. For this reason, the user can purchase one content a plurality of times, which may make it impossible to protect the author.

Therefore, an object of the present invention is to provide a data transmission system and a data receiving device which can protect individual contents even when one event includes a plurality of contents.

[0024]

SUMMARY OF THE INVENTION The present invention comprises a transmitting device for transmitting scrambled content data, and a data receiving device for descrambling and reproducing the content data from the data transmitting device. The device repeatedly transmits a plurality of pieces of data of the same content within the event which is set as the unit of data scrambling, and the data receiving device converts the data of the content received for each event which is set as the unit of data scrambling. After descrambling and receiving the content data in the event, determine whether the content data has already been purchased from the status indicating that the content data has been received, and determine that the content data has not been purchased yet Once the content data has been approved, Data that stores a status indicating that the content data has been purchased after purchasing the content data, and controls to prohibit the purchase of the content if it is determined that the content data has already been purchased. It is a transmission system.

According to the present invention, descrambling means for descrambling content data received for each event, which is a unit of data scrambling, and that when content data in an event is received, the content data is received. From the status shown, it is determined whether or not the content data has been purchased. If it is determined that the content data has not been purchased yet, the purchase of the content data is permitted, and after the purchase of the content data, the content data is purchased. And a content purchase control means for storing a status indicating that the content data has been purchased, and controlling to prohibit the purchase of the content when it is determined that the content data has been purchased. It is.

When the content data in the event is received, it is determined from the status indicating that the content data has been received whether or not the content data has already been purchased, and it is determined that the content data has not been purchased yet. Then, the user is allowed to purchase the content data, and after purchasing the content data, stores a status indicating that the content data was purchased,
If it is determined that the content data has already been purchased, by controlling to prohibit the purchase of the content, even if there are multiple contents in one event,
Each content can be protected.

By transmitting a program for performing such control using an MHEG script, a general-purpose receiver can be used without requiring a special control circuit.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. The system to which the present invention is applied broadcasts a music program using digital satellite broadcasting, and distributes audio data related to the music program so that a viewer can listen to the music program. If you listen to a song that you like, you can easily purchase the song on the spot.

FIG. 1 shows the overall configuration of a music content distribution system to which the present invention is applied. As shown in the figure, the ground station 1 for digital satellite broadcasting includes a material for television program broadcasting from a television program material server 6, a material for music data from a music material server 7, and an additional audio information server 8 Additional information from the
GUI data from an I (Graphical User Interface) data server 9 is sent.

The television program material server 6 is a server for providing a material of a normal music broadcast program. The material of the music broadcast sent from the television program material server 6 is a moving image and a sound.
For example, a moving image and sound for promotion of a new song introduction are broadcasted, or a countdown of the latest hit songs is broadcasted.

The music material server 7 is a server that provides an audio program using an audio channel. The material of this audio program is audio only. The music material server 7 sends materials of audio programs of a plurality of audio channels to the ground station 1. In the program broadcasting of each audio channel, the same music is repeatedly broadcast for a predetermined unit time. Each audio channel is independent, and various usages can be considered. For example, one audio channel repeatedly broadcasts a recommended song in the latest Japanese pop music for a predetermined time, and another audio channel broadcasts a recommended song.
The recommended song in the latest American pop is repeatedly broadcast for a predetermined time, and in other audio channels,
The recommended music may be repeatedly broadcasted from jazz for a predetermined time. Also, a plurality of songs of the same artist may be divided into respective audio channels and repeatedly broadcast.

The additional audio information server 8 provides time information of the music output from the music material server 7.

The GUI data server 9 includes data for forming a screen of a list page of music to be distributed and an information page of each music, data for forming still image data of a jacket, and an EPG (Electric Program Guide). To provide data for forming the screen of FIG. As will be described later in detail, in a system to which the present invention is applied, lyrics of music to be distributed, artist concert information, and the like can be displayed on the screen by operating a GUI on the screen. Also, by operating the GUI on the screen, it is possible to select a music piece, download it, make a reservation for it, and the like. The data for that purpose is sent from the GUI data server 9. The GUI data includes, for example, MHEG (Multimedia and Hypermedia Information
Coding Experts Group) method is used.

The ground station 1 includes the above-described video data and audio data as the material of the music program broadcast from the television program material server 6, the audio data as the material of the audio channel from the music material server 7,
The voice additional information from the voice additional information server and the GUI data from the GUI data server 9 are multiplexed and transmitted. At this time, the video data of the television program broadcast is compressed by, for example, the MPEG (Moving Picture Experts Group) 2 system, and the audio data of the television program broadcast is compressed by the MPEG audio system. The audio data of each audio channel is divided into two different formats, eg, MPEG2 audio format and ATRAC.
(Adaptive Transform Acoustic Coding). These data are encrypted using key information from the key information server 10 at the time of multiplexing.

In the digital satellite broadcasting system,
The billing contract includes a flat system in which a predetermined fee is paid every predetermined period and a PPV system in which a fee is paid according to the content every time the content is viewed.
The main television program is billed in a flat manner, and music data to be downloaded is
Charging is performed by the PV method. In the PPV method, scrambling is performed in units of one event. In the case of music data, the same music data is repeatedly transmitted multiple times within one event.

The signal from the ground station 1 is received by the receiving equipment 3 of each home via the satellite 2. The satellite 2 has a plurality of transponders. One transponder has a transmission capacity of, for example, 30 Mbps. As the receiving equipment 3 of each home, a parabolic antenna 11 and an IRD
(Integrated Receiver Decoder) 12, a storage device 13, and a television receiver 14 are prepared.

A signal transmitted via the satellite 2 is received by the parabolic antenna 11. This received signal is transmitted to an LNB (Low Noise Bl) attached to the parabolic antenna 11.
ockDownconverter) 15 is converted to a predetermined frequency,
It is supplied to IRD12.

The IRD 12 selects a program of a predetermined program from a received signal and demodulates video data and audio data. In addition, the IRD 12 includes a list page of music to be distributed, an information page of each music,
A screen for EPG is formed. Then, the output of the IRD 12 is supplied to the television receiver 14.

The storage device 13 is for storing downloaded audio data.
For example, as the storage device 13, an MD (Mini
Disc) Recorder / player, DAT (Digital Audio)
Tape) Recorder / player, DVD (Digital Video Di)
sc) A recorder / player can be used. Further, a personal computer is used as the storage device 13 and its hard disk or CD-R (CD-Recor
dable) can also store audio data.

The IRD 12 is connected to the accounting server 5 via the telephone line 4, for example. An IC card in which various information is stored is inserted into the IRD 12. When the audio data of the music is downloaded, the information is
It is stored on the C card. The information of the IC card is sent to the accounting server 5 via the telephone line 4. The billing server 5 performs appropriate billing from the download information and bills the viewer. As described above, by performing appropriate charging, the copyright of the downloaded music can be protected.

As described above, in the system to which the present invention is applied, the ground station 1 includes the video data and audio data serving as the music program broadcast material from the television program material server 6 and the audio data from the music material server 7. The audio data serving as the material of the channel, the audio additional information data from the audio additional information server 8, and the GUI data from the GUI data server 9 are multiplexed and transmitted. Then, when this broadcast is received by the receiving facility 3 of each home, a music program is viewed, and a GUI screen is displayed based on the transmitted GUI data. When a necessary operation is performed while viewing the GUI screen, an information page for each song can be viewed, and a preview of each song can be performed. Further, by performing necessary operations while viewing the GUI screen, audio data of a desired music piece can be downloaded and stored in the storage device 13.

Next, the operation of the viewer in the receiving facility 3 will be described in more detail. When this broadcast is received by the receiving facility 3 of each home, a screen as shown in FIG. 2 is displayed on the television receiver 14. A moving image based on the music program provided from the television program material server 6 is displayed in the television program display area 21A at the upper left of the screen. In the upper right part of the screen, a list 21B of songs of each channel being broadcast on the audio channel is displayed. A text display area 2 is located at the lower left of the screen.
1C and a jacket display area 21D are set. Furthermore, a lyrics display button 22, a profile display button 23, an information display button 24, a reservation recording button 25, a reservation list display button 26, a recording history display button 27, and a download button 28 are displayed on the right side of the screen.

The viewer searches for a musical piece of interest while viewing the musical piece name displayed on the list 21B.
When the user finds a song of interest, the user operates the arrow keys of the remote commander to move the cursor to the song, and then presses the enter key of the remote commander attached to the IRD 12. As a result, it is possible to listen to the music piece with the cursor. That is, in each audio channel, the same music is repeatedly broadcast during a predetermined unit time, so that the television program display area 21A
Is switched to the audio channel of the song without changing the screen, and the song can be heard. At this time, a still image of the CD jacket of the music is displayed in the jacket display area 21D.

In this state, when the cursor is moved to the lyrics display button 22 and the enter key is pressed (hereinafter, the operation of moving the cursor to the button and pressing the enter key is called the button), the lyrics of the music are displayed in the text display area 21C. Displayed at the timing synchronized with the audio data. Similarly, when the profile display button 23 or the information display button 24 is pressed, the artist profile or concert information corresponding to the music is displayed in the text display area 21C. In this way, the viewer can know what kind of music is currently being distributed,
You can know detailed information about each song.

The viewer presses the download button 28 when he wants to purchase the tune listened to. When the download button 28 is pressed, the audio data of the selected music is downloaded and stored in the storage device 13. Along with the audio data of the music, lyrics data, artist profile information, jacket still image data, and the like can be downloaded. Every time a song is downloaded, its information is stored in an IC in the IRD12.
Stored on the card. The information stored on the IC card
For example, it is downloaded to the accounting server 5 once a month. Thereby, the copyright of the downloaded music can be protected.

When the viewer wants to make a reservation for download in advance, he presses the reservation recording button 25.
When this button is pressed, the GUI screen is switched, and a list of songs that can be reserved is displayed on the entire screen. This list can display music searched in units of one hour, one week, or genre. When the viewer selects a song to be reserved for download from this list, the information is registered in the IRD 12. And
If you want to check the songs that have already been reserved for download, press the reserved list display button 26,
It can be displayed on the entire screen. The music thus reserved is downloaded by the IRD 12 at the reserved time and stored in the storage device 13.

When the viewer wants to confirm the downloaded music, the recording history button 27 can be pressed to display a list of already downloaded music on the entire screen.

As described above, in the receiving equipment 3 of the system to which the present invention is applied, the GUI of the television receiver 14 is used.
A list of songs is displayed on the screen. And this GU
When a song is selected in accordance with the display on the I screen, the song can be previewed, and the lyrics of the song, the artist profile, and the like can be known. Further, it is possible to perform downloading of music and reservation thereof, display of a download history and a list of reserved music, and the like.

As described above, in the music content distribution system to which the present invention is applied, music broadcast programs are distributed, and audio data of music is distributed using a plurality of audio channels. Then, the user can search for a desired music using a list of the music that has been distributed, and can easily store the audio data in the storage device 13. Hereinafter, such a system will be described in more detail.

FIG. 3 shows the configuration of the ground station 1 in the music content distribution system to which the present invention is applied.

In FIG. 3, material data from the television program material registration system 31 is registered in the AV server 35. This material data is video data and audio data. The data registered in the AV server 35 is sent to a television program transmission system 39, where the video data is compressed by, for example, the MPEG2 system, and the audio data is compressed and packetized by, for example, the MPEG2 audio system. The output of the television program transmission system 39 is sent to the multiplexer 44.

The audio data from the music material registration system 32 is an MPEG2 audio encoder 3
6A and the ATRAC encoder 36B, after being encoded respectively, the MPEG audio server 40
A and registered in ATRAC audio server 40B. MP registered in the MPEG audio server 40A
The EG audio data is sent to the MPEG audio transmission system 43A, where it is packetized and sent to the multiplexer 44. ATRAC data registered in the ATRAC audio server 40B is ATRAC data.
The data is sent to the audio transmission system 43B as quadruple-speed ATRAC data, packetized here, and sent to the multiplexer 44.

Further, the additional audio information from the additional audio information registration system 33 is registered in the additional audio information database 37. The additional audio information registered in the additional audio information database 37 is sent to the additional audio information transmitting system 41, where it is packetized,
Sent to

The GUI data from the GUI material registration system 34 is registered in the GUI material database 38. GU registered in the GUI material database 38
The I material data is sent to the GUI authoring system 42, where the GUI screen data is processed and packetized, and then sent to the multiplexer 44. Here, the GUI material data includes still image information of a jacket, lyric information of music, concert information of an artist, and the like. Still image information is, for example, JPEG (Joint Photograp).
hic Experts Group), and the lyric information is, for example, text data of up to 800 characters and is packetized.

In the multiplexer 44, the video packet and the audio packet from the television program transmission system 39, the audio packet from the MPEG audio transmission system 43A, the quadruple speed audio packet from the ATRAC audio transmission system 43B, the audio additional information The voice additional information packet from the transmission system 41 and the GUI data packet from the GUI authoring system 42 are time-division multiplexed and encrypted using key information from the key information server 10 (FIG. 1).

The output of the multiplexer 44 is sent to a radio wave transmission system 45, where an error correction code is added, modulated,
After being subjected to processing such as frequency conversion and the like, it is transmitted from the antenna to the satellite 2.

FIG. 4 shows an example of data transmitted from the ground station 1. Each data shown in this figure is actually multiplexed on the time axis. As shown in FIG. 4, one event is between time t1 and time t2, and the next event is from time t2. An event is a unit for changing the lineup of music, and is usually in units of 30 minutes or 1 hour. For example, it is conceivable to broadcast the 20th to 11th of the top 20 of the latest hit songs in an earlier event, and broadcast the 10th to 1st in a later event. This event is a unit of encryption.

As shown in FIG. 4, from time t1 to time t2
In the event (1), a music program having a predetermined content A1 is being broadcast in a normal video program broadcast. Time t
In the event starting from 2, a music program having a predetermined content A2 is broadcast. What is broadcast on this normal music program is moving images and audio.

For example, ten audio channels CH1 to CH10 are prepared.
At this time, each audio channel CH1, CH2, C
In H3,..., CH10, the same music is repeatedly transmitted during one event. That is, in the event from time t1 to time t2, the audio channel CH
1, the music B1 is repeatedly transmitted, the music C1 is repeatedly transmitted on the audio channel CH2, and thereafter, the music K1 is similarly transmitted on the audio channel CH10.
Is repeatedly transmitted. In the event starting from the time t2, the music B2 is repeatedly transmitted on the audio channel CH1, the music C2 is repeatedly transmitted on the audio channel CH2, and thereafter, the music K2 is repeatedly transmitted on the audio channel CH10. This is common to the MPEG audio channel and the 4 × ATRAC audio channel.

That is, in FIG. 4, the same numbers in parentheses, which are the channel numbers of the MPEG audio channel and the 4 × -speed ATRAC audio channel, relate to the same music. The number in parentheses, which is the channel number of the additional audio information, is the additional audio information added to the audio data having the same channel number. Still image data and text data transmitted as GUI data are also formed for each channel. These data are transmitted in a time-division multiplexed manner in an MPEG2 transport packet, and are reconstructed in the IRD 12 using the header information of each data packet.

Next, the receiving equipment 3 in each home will be described. As shown in FIG. 1, the receiving facilities in each home include:
A parabolic antenna 11, an IRD 12, a storage device 13, and a television receiver 14 are provided. Here, as the IRD 12, as shown in FIG.
An analog audio output terminal Aout, a digital audio output terminal Dout such as IEC958 for transmitting audio data via an optical cable, and a digital interface terminal Dif such as IEEE1394 are provided. Therefore, the storage device 13 having only the analog audio input terminal Ain, IE
A device having a PCM audio input terminal Din such as C958 or a device having a bidirectional digital interface terminal Dif such as IEEE1394 can be connected.

As shown in FIG. 5B, when a storage device 13A having only an analog audio input terminal Ain is used as a storage device,
An analog output terminal Aout of the IRD 12 and an analog input terminal Ain of the storage device 13A are connected by an analog cable. As shown in FIG. 5C, a PCM such as IEC958 is used as a storage device.
When the storage device 13B having the audio input terminal Din is used, the digital output terminal Dout of the IRD 12 and the digital input terminal Din of the storage device 13B are connected by, for example, an IEC958 optical fiber. Further, as shown in FIG. 5D, when a storage device 13C having a bidirectional digital interface terminal Dif such as IEEE1394 is used as the storage device,
Digital interface terminal Dif of D12 and digital interface terminal D of storage device 13C.
is connected with a digital interface cable.

As shown in FIG. 5B, when a storage device having no digital input terminal is used, the downloaded MPEG audio data is subjected to MPEG2 decoding processing in the IRD 12 and further to D / A conversion and output from an analog audio output terminal Aout. Then, the storage device 13A is connected from the IRD 12 via an analog cable.
Sent to In this case, a configuration is adopted in which a control signal is exchanged between the IRD 12 and the storage device 13A using wireless communication such as infrared rays or wired communication using a cable to confirm a connection relationship and a download operation. It is also possible.

As shown in FIG. 5C, when the storage device 13B having the PCM audio input terminal Din is used as the storage device, the downloaded MPEG audio data is stored in the IRD 12
The decoding process of MPEG2 is performed within the device, and the IRD 12 outputs the data as PCM audio data. And IR
From D12, it is sent to the storage device 13B via, for example, an IEC958 optical cable. Again, I
A control signal may be exchanged between the RD 12 and the storage device 13A using wireless communication such as infrared rays or wired communication using a cable to confirm a connection relationship or a download operation. is there.

As a specific example in the case shown in FIG. 5D, IE
When an MD recorder / player having a bidirectional digital interface terminal Dif such as EE1394 is used as a storage device, the downloaded quadruple-speed ATRAC data is directly sent from the IRD 12 via, for example, an IEEE1394 digital interface cable. Sent to storage device.

As described above, devices used as the storage device 13 include analog input devices and PCs.
There are three systems, one for inputting M audio data and one for inputting ATRAC data.

FIG. 6 shows an example of the configuration of the IRD 12. The IRD 12 has an input terminal T1, an analog video output terminal T as an external terminal or an interface.
2, an analog audio output terminal T3, T4, an optical digital output interface 59, an IEEE 1394 interface 60, a man-machine interface 61, an IC card slot 62, and a modem 63.

The received signal input to input terminal T 1 is supplied to tuner 51. In the tuner 51, the control C
Based on a setting signal from a PU (Central Processing Unit) 58, a signal of a predetermined carrier frequency is selected from the received signals. Then, this received signal is QPSK (Quad
rature Phase Shift Keying) is demodulated, further subjected to error correction processing, and an MPEG transport stream is output.

The output of the tuner 51 is supplied to a descrambler 52. The received ECM data and EMM data are input to the descrambler 52,
The descrambling key data stored in the IC card 65 is input via the IC card slot 62 and the control CPU 58. The descrambler 53 stores the received ECM data and EMM data with the IC card 6
5, the MPEG transport stream is descrambled. The descrambled MPEG transport stream is transport I
It is sent to C53.

The transport IC 53 separates a desired packet from the stream from the descrambler 52 based on a command from the CPU 58.
In a transmission packet, a packet identifier (PI
D) is provided. A desired packet is extracted based on the PID, and the packet is sent to the MPEG audio decoder 54 and the MPEG video decoder 55.

The video signal packet is sent to the MPEG video decoder 55. The audio signal packet is MPE
It is sent to the G audio decoder 54.

The MPEG video decoder 55 receives the video signal packet from the transport IC 53,
An MPEG2 decoding process is performed to form video data before data compression. This video data is N
The signal is supplied to the TSC conversion circuit 57 and the NTSC conversion circuit 57
Then, the video data decoded by the MPEG video decoder 55 is converted into a composite video signal and converted into an analog signal. The output of the NTSC conversion circuit 57 is output from the analog video output terminal T2 to the television receiver 14.

The MPEG audio decoder 54 receives a video signal packet from the transport IC 53, performs an MPEG audio decoding process, and forms audio data before data compression. The decoded audio data is converted into an analog audio signal by the DA converter 56, and then output from the analog audio output terminal T3 to the television receiver 14.
The audio data decoded by the audio decoder 54 is transmitted to the optical digital output interface 59.
Sent to

The setting of the carrier frequency of the received signal is performed based on the channel setting signal input from the remote controller 64 by the viewer. When a program of a desired channel is set, the reception frequency of the tuner 51 is set to a predetermined carrier frequency by referring to an NIT (Network Information Table). Then, a PAT (Program Asso
PMT (Program MapTable) which is information on the desired channel by referring to the packet in the ciation table)
Is extracted. By referring to this PMT, the PID of the video, audio, and additional data packet of the desired channel can be obtained.

Further, if the PMT has a sub-channel related to this channel, the PMT of this sub-channel can be described. PMT for this subchannel
Is described, the PM of this subchannel is
The PID packet of T is extracted, and the PID of the data packet of the desired subchannel is obtained by referring to the PMT of this subchannel.

[0086] Still images such as CD jackets, and GUI data such as lyrics and artist information are transmitted based on the MHEG5 system. For mono-media such as still images and audio, MHEG5 content is created together with a script indicating a display procedure (file information, link information, time information, event) and the like. The created content is D
SM-CC (Digital Storage Media-Command and Cont
rol) format.

[0077] The music list 21B is displayed on the screen shown in FIG.
When the user selects a song and listens to the audio data of the song, the audio data of the selected song is extracted by the transport IC 53, decoded by the MPEG audio decoder 54, and subjected to digital / analog conversion by the DA converter 56. After the switch S
The signal is output from the analog audio output terminal T3 to the television receiver 14 through W1.

At this time, the viewer uses the remote control 64 to
When the various operations described above are performed, the operation is sent from the man-machine interface 61 to the control CPU 58. Control CPU5
8 processes the GUI data according to the operation of the viewer.

For example, when the lyrics button 22 is pressed, the text data of the lyrics transmitted as the additional data is supplied to the MPEG video decoder 55. Then, the data is converted into image data using an OSD (On Screen Display) function, converted into a composite video signal by the NTSC conversion block 57, and output from the analog video output terminal T2 to the television receiver. Thereby, at the same time as the sound of the music is played from the speaker of the television receiver 14, the lyrics are displayed in the text display area 21C of the screen in synchronization with the sound.

When the download button 28 is pressed on the screen shown in FIG. 2 and the audio data of the music is downloaded, the sub-channel corresponding to the download button 28 is set. P of this main channel
With reference to the MT, a PID for extracting the PMT of the specified sub-channel is specified. Then, the MPE sent on the sub-channel from the sub-channel PMT
The PID of audio compressed by the G method, audio data compressed by ATRAC, and additional data is specified.

Referring to the PID of this sub-channel,
From the transport IC 53, audio data compressed by the MPEG system, audio data compressed by ATRAC, and additional data are extracted.

The IEEE 1394 interface 60
When an IEEE 1394-compatible storage device is connected, the transport IC 53 selects the quadruple-speed ATRAC data and sends it out to the storage device via the IEEE 1394 interface 60 as it is.

The optical digital output interface 59 has I
When an EC958-compatible device is connected, MPEG audio data is selected by the transport IC 53, decoded by the MPEG audio decoder 54, and transmitted to the storage device via the optical digital output interface 59. When a storage device is connected to the analog audio output terminal T4, MPEG audio data is selected, decoded by the MPEG audio decoder 54, converted into an analog signal by the DA converter 56, and transmitted to the storage device. .

The satellite broadcasting includes a flat contract and a PPV contract as billing forms. Flat contracts are billed on a monthly basis for a specific channel, which includes contracting on a channel-by-channel basis,
Some contracts are made with multiple channel packages. In the PPV, a fee is set for each program,
There are two types, one that is applied in advance and one that can be purchased immediately. In such a music content distribution service, the main channel is in the form of a flat contract, and the download of music data is performed under a PPV contract. Such a pay channel receiving process is performed as shown in FIGS.

First, at the time of contract, CAT (Condition Acce
ss Table) is received, and from this CAT, the EMM (Entitlem) which is individual information such as identification of the conditional access system and contract information.
The PID of the entManagement Message) packet is obtained (step S1). An EMM addressed to itself that matches the individual ID in the IC card 65 is received (step S2), the EMM is sent to the IC card 65, and the contract contents are stored in the IC card 65 (step S2).

When the PPV purchase is determined (step S
4) The contract type in the IC card 65 is checked (step S5). From this contract type, it is checked whether or not a contract is concluded. If the contract is not concluded, purchase is prohibited (step S6).

By selecting a desired channel and acquiring the PMT, the PID of the ECM can be obtained. This EC
M (Entitlement Control Message) is received and IC
It is sent to the card 65. ECM is an encrypted descramble key. The charge information PPV_fee of the content in the ECM is extracted (step S7),
It is determined whether or not the sum of the fee information PPV_feed and the total viewing fee is equal to or less than the excess viewing Over_view (step S8). If it exceeds the excess viewing Over_view, the purchase is prohibited (step S6). Excessive viewing Ov
If er_view is not exceeded, ser in ECM
The device_id, event_id, and the latest total viewing fee are stored in the IC card 65 (step S9). Then, the descrambling key is returned from the IC card 65. The PID and key of the component to be descrambled are set in the descrambler 52, and the components of the desired program are descrambled (step S1).
0).

In the scramble by PPV as described above, one content is usually treated as one event. However, in the case of relatively short content such as music data, one content is used.
If the singles event is used, the number of events becomes enormous, and the IC card 65 immediately overflows.

Therefore, the same music is transmitted a plurality of times, and the contents of the plurality of times are treated as one event. As described above, even when a plurality of contents are handled as one event, the processing shown in the flowchart of FIG. 9 is performed so that protection for each content can be achieved.

In FIG. 9, while the main channel television program is being received, the program
Sent by G script. This script is received (Step S21).

The main channel television program is received, and the audio data of the program is monitored as audio output (step S22). Then, it is determined whether or not the download sub-channel is viewed (step S23).

If it is determined that the sub-channel is to be viewed, the sub-channel is displayed for a predetermined preview time (eg,
30 seconds) (step S)
24). Then, the audio output is switched to the sub-channel (step S25). Thereby, the sound of the sub-channel is monitored (step S26).

While the sound of the sub-channel is being monitored, it is determined whether to download the data of the sub-channel (step S27). If the data of the sub-channel is not downloaded, it is determined whether a predetermined preview time has elapsed (step S28).
If the predetermined preview time has not elapsed, the process returns to step S26, and monitoring of the audio of the sub-channel is continued. When the predetermined preview time has elapsed, the process returns to step S22.

If it is determined in step S23 that the sub-channel is not viewed, it is determined whether to download the sub-channel (step S29).
If sub-channel is not downloaded, step S
Returned to 22.

If it is determined in step S29 that the sub-channel is to be downloaded, the status of the purchased
It is determined whether or not this sub-channel has been purchased (step S30). If the purchased status indicates that this is not your first purchase, "This song has been purchased"
Is displayed (step S31), and the process returns to step S22.

In step S30, if it is determined from the purchased status that this sub-channel has been purchased for the first time, it is determined whether or not it is the beginning of one song (step S32). Then, the sound of the sub-channel is monitored (step S33). Then, it is determined whether the data for one music has been completed (step S3).
4) The monitoring of the audio of the sub-channel is continued until the end of the data of one music.

When the reception of the data for one song is completed, it is determined whether the data for one song has been received correctly (step S35). If the data has not been received correctly, the process returns to step S32, and again the sub-channel Is monitored. If it is determined in step S35 that the song has been correctly received, the process is passed from the MHEG script to the registration program of the CPU 58, and a purchased status indicating that the song has been purchased is recorded in the memory or the IC card 65 for the CPU 58. (Step S36), and the process returns to step S22.

When the processing shown in the above-mentioned flowchart is performed, an audio output as shown in FIG. 10 is obtained. That is, as shown in FIGS. 10A and 10B, it is assumed that the video and audio of the main television are transmitted, and the event length of the main channel is TA. Then, in the sub-channel, the MPE as shown in FIG.
G audio data and ATRA as shown in FIG.
It is assumed that audio data of C is transmitted and additional audio information is transmitted as shown in FIG. 10E.

FIG. 10F shows output audio data. As shown in FIG. 10F, when no operation is performed, the sound of the main television broadcast (FIG. 10B) is output.

At time t11, when a music piece is selected and the enter key is pressed, the music is selected for a predetermined preview time TC.
MPEG audio data (FIG. 10C) is output.
When the predetermined preview time elapses, the sound returns to the main television broadcast sound.

At time t12, when the download button 28 is pressed, from the purchased status, if the MPEG audio data has not been purchased yet, the next MP
MPEG audio data is output from time t13, which is the beginning of the EG audio data, to time t14, at which the audio data ends. When the data of one music is received, a status indicating that the music has been purchased is recorded, and the sound is switched to the main television sound.

As described above, when data for one song is received, a status indicating that the data has been purchased is recorded, and when it is determined from this status that the data has been purchased, the main television Thus, even if there is a plurality of content data in one event, the content data can be reproduced only once, and the data of each content can be protected. become.

In this case, the main television broadcast and the download data as the subprogram constitute a completely independent program. Therefore, the event length TA of the main program
And the event length TB in each subprogram can be completely and independently set.

In the above example, the download of MPEG audio data has been described.
Also in the case of the data of C (FIG. 10D), when data of one song of ATRAC is received, a status indicating that the data has been purchased is recorded, and from this status, it is determined that the data has been purchased. Then, processing is performed so that the sound can be switched to the sound of the main television, whereby the data of the content can be similarly protected.

[0105]

According to the present invention, when content data in an event is received, it is determined whether or not the content data has already been purchased based on the status indicating that the content data has been received. If it is determined that the content data has not been purchased yet, the purchase of the content data is permitted, and when the content data is purchased, a status indicating that the content data has been purchased is stored. If it is determined that there is a plurality of contents, by controlling the purchase of the contents to be prohibited, it is possible to protect each content even when one event includes a plurality of contents.

By transmitting a program for performing such control using an MHEG script, a general-purpose receiver can be used without requiring a special control circuit.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of an example of a music content distribution system to which the present invention has been applied.

FIG. 2 is a diagram illustrating an example of a screen displayed on a television receiver in the system illustrated in FIG. 1;

FIG. 3 is a block diagram illustrating an example of a configuration on a transmission side in the system illustrated in FIG. 1;

FIG. 4 is a diagram showing a structure of an example of data transmitted in the system shown in FIG. 1;

FIG. 5 is an explanatory diagram showing a connection relationship between an IRD and a storage device in the system shown in FIG. 1;

6 is a block diagram showing an example of an IRD configuration in the system shown in FIG.

FIG. 7 is a flowchart used to explain a billing process when a contract is changed.

FIG. 8 is a flowchart used to explain a PPV charging process.

FIG. 9 is a flowchart showing processing when purchasing content data.

FIG. 10 is a schematic diagram used to explain a case where content has been purchased in the processing shown in FIG. 9;

FIG. 11 is a block diagram used for explaining a conventional billing method.

FIG. 12 is a block diagram used for describing processing on the receiver side in a conventional charging method.

[Explanation of symbols]

3 ... receiving equipment, 12 ... IRD, 13 ... storage device, 14 ... television receiver,

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Claims (4)

[Claims] 1. A transmission device for transmitting data of scrambled content, and a data reception device for descrambling and reproducing content data from the data transmission device, wherein the data transmission device is configured to scramble the data. The data receiving apparatus repeatedly transmits data of a plurality of identical contents within the event set as the unit of the data, and descrambles the data of the content received for each event set as the unit of the data scrambling, When the data of the content in the event is received, it is determined whether or not the data of the content has already been purchased from the status indicating that the data of the content has been received, and it is determined that the data of the content has not been purchased yet. Once you authorize the purchase of the content data, After purchasing the content data, a status indicating that the content data has been purchased is stored, and if it is determined that the content data has been purchased, control is performed to prohibit the purchase of the content. Data transmission system. 2. The transmission device according to claim 1, wherein the transmission device sends a script for controlling the multimedia, and the reception device receives the script and executes the control based on the script. Data transmission system. 3. A descrambling means for descrambling data of content received for each event which is a unit of data scrambling, and when receiving data of content in the event, it is determined that the data of the content has been received. From the status shown, it is determined whether or not the data of the content has been purchased. If it is determined that the data of the content has not been purchased yet, the purchase of the data of the content is permitted and the data of the content is purchased. After that, a status indicating that the data of the content has been purchased is stored, and if it is determined that the data of the content has already been purchased, content purchase control means for controlling so as to prohibit the purchase of the content is provided. A data receiving device provided. 4. The data receiving apparatus according to claim 3, wherein a script for controlling the multimedia is received, and the control is executed based on the script.