JP4742951B2 - Information reproducing apparatus, control method therefor, and control program - Google Patents

Description

  The present invention relates to a technique for reproducing information such as music content, and more particularly to a new information reproduction technique that combines reception of broadcast and reproduction of music content.

  Currently, in-vehicle devices such as car navigation devices are being developed in the direction of mounting communication functions. For example, in the case of a car navigation device, it is possible to receive a service such as distribution of the latest map data using a communication function. In this way, the development of various services is expected in the future because automobiles have communication functions.

  Future wireless communication infrastructure development is indispensable for the realization of comfortable services using communication functions. Specifically, speeding up communication, constant connection, and flat-rate charges are essential. These are becoming reality through narrow-area communication (DSRC), third-generation mobile phone systems, wireless LANs, and the like that are used in automatic toll collection systems (ETC).

  By the way, in recent years, music distribution using a telecommunication line is becoming widespread. However, at present, it is premised on a wired communication infrastructure such as FTTH, CATV, and xDSL, and the mobile communication system applied to automobiles has been improved as described above, but as a distribution base for music content. Is still not enough.

  In music distribution, copyright protection technology for preventing unauthorized distribution of content is indispensable. However, at present, the result is that the user's convenience is suppressed as the copyright protection is strengthened, and the improvement in the communication speed does not directly improve the user's convenience.

In the field of car audio, where listening to cassette tapes and CDs was the mainstream, the introduction of music distribution services incorporating copyright protection technology has begun. However, from the above viewpoint, the music data itself is not distributed, and a large number of encrypted music data are preinstalled on the hard disk, and the music that the user requests to purchase from among them. The decryption key (license key) is distributed (see, for example, Patent Documents 1 and 2). In this case, even the music that is not necessarily listened to by the user is stored in the hard disk, which is wasteful in this respect. However, considering the recent increase in capacity and price of the hard disk, it is realistic. It can be said.
JP 2003-331140 A JP 2003-330474 A

  As described above, music distribution services using communication functions are being introduced in the current car audio field, and convenience is greatly improved.

  On the other hand, new technologies such as digital broadcasting are being developed in the field of radio broadcasting. However, the conventional problem that the sound quality is deteriorated due to a decrease in reception sensitivity depending on the location still remains.

  Accordingly, an object of the present invention is to realize high quality broadcasting using a content distribution service via a communication medium.

An information reproducing apparatus according to an aspect of the present invention includes a broadcast receiving unit that receives a broadcast program, a storage unit that stores a plurality of contents each encrypted with a different encryption key, and before receiving the broadcast program, Broadcast information obtaining means for obtaining broadcast program information specifying the content scheduled to be aired on the broadcast program and the scheduled broadcast time of the content, and whether the content specified by the broadcast program information is stored in the storage means search means for searching for whether or not a decryption key receiving means for receiving a decryption key management server sent, decoding means for performing decoding of the content by using the decryption key received by the pre-Symbol decryption key reception means When, the content decoded by said decoding means, based on the broadcast program information, and content reproducing means for reproducing in synchronization with the broadcast program, before When the content specified by the broadcast program information does not exist in the storage means as a result of the search by the search means, the selection means for allowing the user to select by which medium the content is acquired, and the broadcast program information Broadcast reproduction means for reproducing the broadcast received by the broadcast reception means instead of the content reproduction when the specified content does not exist in the storage means and is not acquired. .

  According to this configuration, it is possible to realize high-quality content reproduction that is not affected by a decrease in radio wave reception sensitivity or the like as the broadcast program progresses.

An information reproducing apparatus according to another aspect of the present invention includes a broadcast receiving unit that receives a broadcast program, a plurality of contents each encrypted with a different encryption key , and a content that a user has purchased among the plurality of contents Storage means for accumulating a decryption key corresponding to , and broadcast information obtaining means for obtaining broadcast program information specifying content scheduled to be on-air in the broadcast program and scheduled broadcast time of the content before receiving the broadcast program; A search means for searching for the content specified in the broadcast program information , which is stored in the storage means, and for which the decryption key of the content has not been acquired, and searched by the search means Request means for requesting delivery of the decryption key of the content to the management server, and decryption key reception for receiving the decryption key transmitted in response to the request by the management server And the step, prior Symbol by using the decryption key received by the decryption key reception means, a decoding means for performing decoding of the retrieved the content by the searching means, the content decoded by said decoding means And content reproduction means for reproducing in synchronization with the information of the broadcast program based on the broadcast program information .

  According to this configuration, only the minimum necessary decryption key is received, and high-quality content reproduction that is not affected by a decrease in radio wave reception sensitivity or the like can be realized as the broadcast program progresses.

  According to a preferred embodiment of the present invention, the decryption key receiving means synchronizes with the timing when the content scheduled to be aired on the broadcast program while the broadcast program is being received by the broadcast receiving means, Preferably, the decryption key is received from the management server.

  Similarly, with such a configuration, it is possible to realize high-quality content reproduction that is not affected by a decrease in radio wave reception sensitivity or the like as the broadcast program progresses.

  According to a preferred embodiment of the present invention, the search means can collectively search for contents scheduled to be on-air by broadcasting for a predetermined period more than a day ahead and stored in the storage means. preferable.

  The same effect can be obtained by this configuration.

According to a preferred embodiment of the present invention, there is further provided means for acquiring the content and additionally storing it in the storage means before the broadcast program is on-air when the user makes a selection using the selection means. It is preferable to have.

  According to this configuration, it is possible to add content that is not stored in the storage unit in advance.

  According to a preferred embodiment of the present invention, when the storable remaining capacity of the storage unit is equal to or less than a predetermined value, the content stored in the storage unit has a number of playbacks less than a threshold value. It is preferable to further have means for deleting.

  According to this configuration, it is possible to cope with an insufficient storage capacity of the storage unit.

According to a preferred embodiment of the present invention, the requesting unit may further request the management server to distribute a decryption key that permits the reproduction of the content for a longer period during the reproduction of the content by the reproduction unit. It is preferable that the configuration is possible.

  According to this configuration, for example, purchase of a new song that can be known from a broadcast program can be determined at the earliest timing while listening.

Still another aspect of the present invention relates to a control method for an information reproducing apparatus including broadcast receiving means for receiving a broadcast program and storage means for storing a plurality of contents each encrypted with different encryption keys. In this control method, before receiving the broadcast program, a broadcast information acquisition step of acquiring broadcast program information specifying content scheduled to be on-air in the broadcast program and scheduled broadcast time of the content, and the broadcast program information a search step in which the identified content searches whether stored in the storage means, the decryption key and decryption key receiving step has received in the previous SL decryption key receiving step of receiving the decryption key management server sent A decrypting step for decrypting the content using the content, and a content playback step for playing back the content decrypted in the decrypting step in synchronization with the broadcast program based on the broadcast program information ; As a result of the search in the search step, when the content specified in the broadcast program information does not exist in the storage means, A selection step for allowing the user to select whether to acquire the content according to the body, and if the content specified in the broadcast program information does not exist in the storage means and is not acquired, the content is replaced with the content reproduction And a broadcast reproduction step of reproducing the broadcast received by the broadcast receiving means .

  According to this configuration, it is possible to realize high-quality content reproduction that is not affected by a decrease in radio wave reception sensitivity or the like as the broadcast program progresses.

Still another aspect of the present invention provides broadcast receiving means for receiving a broadcast program, a plurality of contents each encrypted with a different encryption key , and a decryption corresponding to a content purchased by a user among the plurality of contents. The present invention relates to a control method for an information reproducing apparatus comprising a storage means for storing a key , and obtains broadcast program information specifying content scheduled to be on-air in the broadcast program and scheduled broadcast time of the content before receiving the broadcast program A broadcast information obtaining step, a search step for searching for the content specified in the broadcast program information , stored in the storage means, and for which the decryption key of the content has not been acquired, A requesting step for requesting the management server to deliver a decryption key for the content searched in the searching step, and the management server responding to the request A decryption key receiving step of receiving decryption key signal, using the decryption key received in the previous SL decryption key receiving step, a decoding step of performing decoding of the content found by the search step, the decoding A content reproduction step of reproducing the content decrypted in the conversion step in synchronization with the information of the broadcast program based on the broadcast program information .

  According to this configuration, only the minimum necessary decryption key is received, and high-quality content reproduction that is not affected by a decrease in radio wave reception sensitivity or the like can be realized as the broadcast program progresses.

Still another aspect of the present invention provides a control program for controlling an information reproducing apparatus including broadcast receiving means for receiving a broadcast program and storage means for storing a plurality of contents each encrypted with different encryption keys. About. Before receiving the broadcast program , the control program includes a broadcast information acquisition step for acquiring broadcast program information specifying content scheduled to be aired in the broadcast program and a scheduled broadcast time of the content, and the broadcast program information a search step in which the identified content searches whether stored in the storage means, the decryption key and decryption key receiving step has received in the previous SL decryption key receiving step of receiving the decryption key management server sent A decrypting step for decrypting the content using the content, and a content playback step for playing back the content decrypted in the decrypting step in synchronization with the broadcast program based on the broadcast program information ; When the content specified by the broadcast program information does not exist in the storage means as a result of the search in the search step A selection step for allowing the user to select which medium the content is to be acquired; and if the content specified by the broadcast program information is not present in the storage means and is not acquired, instead of the content reproduction It includes a program code for causing the information reproduction apparatus to execute a broadcast reproduction step of reproducing the broadcast received by the broadcast receiving means .

  According to this configuration, it is possible to realize high-quality content reproduction that is not affected by a decrease in radio wave reception sensitivity or the like as the broadcast program progresses.

Still another aspect of the present invention provides broadcast receiving means for receiving a broadcast program, a plurality of contents each encrypted with a different encryption key , and a decryption corresponding to a content purchased by a user among the plurality of contents. The present invention relates to a control program for controlling an information reproducing apparatus comprising a storage unit for storing a key, and before receiving the broadcast program, a broadcast specifying the content scheduled to be aired on the broadcast program and the scheduled broadcast time of the content A broadcast information obtaining step for obtaining program information , and a search for searching for content specified in the broadcast program information , stored in the storage means, and for which the decryption key of the content has not been acquired. A requesting step for requesting the management server to deliver a decryption key for the content searched in the searching step, and the management server A decryption key receiving step of receiving the decryption key sent in response to the request, using the decryption key received in the previous SL decryption key reception step, decoding performs decoding of the content found by the search step For causing the information reproduction apparatus to execute a content reproduction step and a content reproduction step of reproducing the content decrypted in the decryption step in synchronization with information of the broadcast program based on the broadcast program information The program code is included.

  According to this configuration, only the minimum necessary decryption key is received, and high-quality content reproduction that is not affected by a decrease in radio wave reception sensitivity or the like can be realized as the broadcast program progresses.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the content broadcasted using the content memorize | stored in memory | storage means, such as a hard disk, with high sound quality.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to the following embodiment, It shows only the specific example advantageous for implementation of this invention. In addition, not all combinations of features described in the following embodiments are indispensable as means for solving the problems of the present invention.

  FIG. 1 is a diagram showing an overall configuration of an information reproduction system according to this embodiment.

  This information reproduction system has two communication platforms, for example, a broadcasting station 100 that performs terrestrial digital broadcasting and a mobile communication network 300 that realizes mobile radio access. The broadcast station 100 is, for example, a radio broadcast station that performs terrestrial digital radio broadcasts, and includes a broadcast station server 101 that includes program content to be broadcast and a broadcast antenna 102 that transmits digitally modulated broadcast waves. For example, an orthogonal frequency division multiplexing (OFDM) modulation scheme is used for the digital modulation related to the broadcast. One mobile communication network 300 is configured by, for example, a third generation mobile communication system, and here, a W-CDMA (Wide Band-Code Division Multiple Access) system that accommodates carriers of a plurality of different frequencies is applied.

  A content provider 200 that provides a music distribution service stores a music content and controls distribution of the content, and a content server (management server) 210 that is connected to the content server 210 and receives a music distribution service. The accounting server 250 is configured to manage accounting information. Further, the content server 210 and the broadcast station server 101 are connected to each other, and the music contents stored in both are configured to be the same in conjunction with each other. The content server 210 is further connected to the mobile communication network 300.

  BS 301 is a base station accommodated in mobile communication network 300. In addition, the automobile 400 is equipped with an in-vehicle device 410 as a mobile station (MS) and is currently located in the service area 302 of the base station 301. The in-vehicle device 410 includes a first antenna 420 for communicating with the base station 301 and a second antenna 430 for receiving an OFDM broadcast wave from the broadcast antenna 102. It should be noted that although the mobile communication network 300 can usually accommodate a large number of base stations, only one base station 301 is typically shown here. Similarly, although there may be a plurality of automobiles serving as mobile stations, it should be noted that only one automobile 400 is shown here.

  FIG. 2 is a block diagram showing the configuration of the in-vehicle device 410.

  As shown in the figure, the vehicle-mounted device 410 has a CPU 1 that controls the entire vehicle-mounted device, a RAM 2 that functions as a main memory and also provides a work area for the CPU 1, and a ROM 3 that stores fixed programs and data such as a boot program. First, the following configuration is provided.

  Reference numeral 4 denotes a tuner that receives terrestrial digital radio broadcasts, and demodulates OFDM broadcast waves received via the second antenna 430. Reference numeral 5 denotes a W-CDMA wireless unit, which performs wireless transmission / reception with the base station 301 via the first antenna 420 by the W-CDMA system. Reference numeral 6 denotes an operation unit having, for example, a display unit configured by a liquid crystal display, and a touch panel is configured there.

A hard disk drive (HDD) 7 stores a control program 7a, library information 7b, and a content database (DB) 7c, as shown. A large number of music contents (music data) encrypted with different encryption keys are preinstalled in the content DB 7c. The library information 7b describes information about each content stored in the content DB 7c.

  FIG. 3 shows a data structure example of the content DB 7c. As shown in the figure, the content DB stores a content ID specifying content and content data in association with each other. Each content data is data encoded by a predetermined encoding method such as MPEG2 AAC (MPEG2 Advanced Audio Coding), and then encrypted with a different encryption key for each content data. Therefore, each content cannot be listened to unless a decryption key corresponding to the encryption key used for encrypting the content is obtained and decrypted. However, in this embodiment, in order to enable trial listening, data for a predetermined time (for example, 30 seconds) from the beginning of the music is not encrypted.

FIG. 4 shows an example of the data structure of the library information 7b. The content ID in FIG. 4 is the same as that in FIG. As shown in FIG. 4, for each content ID, for example, a song name, an artist, an album, a genre, a usage type, a decryption key, a key acquisition date, and the number of times of reproduction are recorded as library information. Here, “usage type” is copyright management information, and regulates restrictions on reproduction of the corresponding content. Examples of usage types in the present embodiment include the following.
(A) Audition type: Only the beginning part that is not encrypted can be played.
(B) One-day type: Can be played for one day after obtaining the decryption key.
(C) One week type: Only 7 days can be played after obtaining the decryption key.
(D) 1 month type: Can be played back for 30 days after obtaining the decryption key.
(E) Permanent type: Can be played without restriction after obtaining the decryption key.

  Note that predetermined initial values are set at the time of pre-installation for the above-described usage type, decryption key, key acquisition date and time, and number of reproductions. FIG. 4 shows the initial setting. For example, a trial listening type is set as an initial value for the usage type. Further, the initial value of the decryption key is set to 0xffff, for example, and it is possible to easily determine whether or not the decryption key has been acquired by looking at this value.

  Returning to FIG.

  As shown in FIG. 2, the in-vehicle device 410 includes a DSP (Digital Signal Processor) 8. The DSP 8 mainly performs operations related to audio decoding (including encryption / decryption) and broadcast reproduction control, which will be described later, to realize real-time processing.

  Reference numeral 9 denotes a CD-ROM reader which can read a CD-ROM on which new song data is recorded and add it to the content DB 7c.

  Reference numeral 10 denotes a D / A converter (DAC) that converts radio broadcast data OFDM-demodulated by the tuner 4 and audio data audio-decoded by the DSP 8 into an analog signal, and 11 a speaker that emits the output of the DAC 10.

  The configuration of the in-vehicle device 410 in the present embodiment is as described above, but the in-vehicle device 410 may be incorporated in a car navigation device.

  FIG. 5 is a block diagram showing the configuration of the content server 210.

  As shown in the figure, the content server 210 includes a CPU 21 that controls the entire server, a RAM 22 that functions as a main memory and provides a work area for the CPU 21, and a ROM 23 that stores fixed programs and data such as a boot program. First, the following configuration is provided.

  An operation unit 24 includes a keyboard and a mouse. A communication unit 25 is connected to the mobile communication network 300 for communication. Reference numerals 26a and 26b denote interfaces (I / F) for connecting to the broadcasting station server 101 and the billing server 250 through dedicated lines, respectively.

  27 is a hard disk drive (HDD), including an OS (not shown), a content server management program 27a for realizing the functions of the content server, electronic program guide (EPG) data 27b, distribution history 27c, decryption key A DB 27d and a content DB 27e are stored. The content DB 27e has a data structure similar to that of the content DB 7c in the in-vehicle device 410, but the content DB 27e is constantly updated with the latest music, so the content may be different.

  The content server 210 does not distribute the content itself contained in the content DB 27e to the in-vehicle device 410 via the mobile communication network 300. Instead, as described later, in response to a decryption key distribution request from the in-vehicle device 410, the decryption key stored in the decryption key DB 27d is distributed to the in-vehicle device 410 via the mobile communication network 300.

  Reference numeral 28 denotes a CD-ROM reader / writer, which can write a new song data group in a CD-ROM in a format readable by the CD-ROM reader 9 in the in-vehicle device 410.

  FIG. 6 is a diagram illustrating an example of the data structure of EPG data.

  As shown in the figure, the EPG data includes data fields of a channel, a broadcast date, a start time, an end time, and a title for each program ID for identifying a program. In addition, as the title sub-data, the name of the song to be on-aired in the program is recorded together with the on-air start and end times. In the in-vehicle device 410, by performing a predetermined EPG display operation with the operation unit 6, EPG data can be acquired from the content server 210 via the mobile communication network 300 and the EPG can be displayed on the display unit. Furthermore, when an arbitrary title is selected from the displayed EPG, the contents of the sub-data can be displayed.

  Note that the EPG data may be acquired on the terrestrial digital radio broadcast. For example, the EPG data 27b created in the content server 210 is sent to the broadcast station server 101 every time it is updated. The broadcast station server 101 includes the EPG data 27b in the management data, multiplexes it into an MPEG2 transport stream (MPEG-2 TS), and broadcasts it. In the in-vehicle device 410, the EPG can be displayed on the display unit by performing a predetermined channel operation for EPG display with the operation unit 6.

  FIG. 7 is a diagram illustrating a data structure example of the distribution history 27c.

  Each time the decryption key is distributed, the content server 210 adds information regarding the distribution to the distribution history 27c. The information includes a mobile station ID of a decryption key distribution destination, a content ID corresponding to the distributed decryption key, a usage type, and a distribution date and time, as shown in FIG. The added information is also transmitted to the billing server 250.

  FIG. 8 is a diagram illustrating an example of the data structure of the decryption key DB 27d.

  The decryption key DB 27d stores a decryption key for decrypting corresponding content data for each content ID registered in the content DB 27.

  FIG. 9 is a block diagram showing the configuration of the billing server 250.

  As shown in the figure, the accounting server 250 includes a CPU 31 that controls the entire server, a RAM 32 that functions as a main memory and provides a work area for the CPU 31, and a ROM 33 that stores fixed programs such as a boot program and data. First, the following configuration is provided.

  Reference numeral 34 denotes an operation unit including a keyboard and a mouse. Reference numeral 35 denotes an interface (I / F) for connecting to the content server 210 via a dedicated line. Reference numeral 36 denotes a hard disk drive (HDD), which stores an OS (not shown), an accounting server management program 36a for realizing the accounting server function, and an accounting information DB 36b. The billing information DB 36b stores billing data for each mobile station (on-vehicle device) that receives the music distribution service of the content server 210. For example, when receiving additional data of the distribution history from the content server 210, a charge corresponding to the usage type is added to the billing data of the mobile station.

  The configuration of the information reproduction system in this embodiment is generally as described above.

  As described above, the content DB 27e of the content server 210 can be constantly updated with the latest music, but the broadcasting station server 101 also includes a content DB (not shown) having the same content. That is, the broadcast station server 101 includes a content DB that is updated in conjunction with the content DB 27e of the content server 210. For example, when the content DB 27e of the content server 210 is updated, the updated content is transmitted to the broadcast station server 101 via a dedicated line, and the content DB of the broadcast station server 101 is similarly updated.

  In the present embodiment, the content server 210 and the billing server 250 are configured by separate hardware, but can be realized by a single server. Furthermore, when the broadcast station 100 and the content provider 200 are operated by the same company, the content server 210 and the billing server 250 may be built in the broadcast station 100.

  Hereinafter, the operation of the information reproduction system in this embodiment will be described.

  First, a basic operation sequence of this embodiment will be described with reference to FIGS.

  FIG. 10 is an operation sequence related to a scene from content trial listening to purchase in the content listening mode of the in-vehicle device 410.

  In the in-vehicle device 410, the user selects a song from the content DB 7c via the operation unit 6 and performs a trial listening operation (step S1). As described above, it is possible to audition without acquiring a decryption key for a predetermined time (for example, 30 seconds) from the beginning of the song. If the user wishes to purchase the song, a purchase operation including selection of the usage type is performed (step S2). In response, the in-vehicle device 410 issues a decryption key distribution request message including the mobile station ID, content ID, and usage type to the content server 210 (step S3).

  When receiving the decryption key distribution request message, the content server 210 performs authentication based on the mobile station ID included therein (step S4). If this authentication is successful, a decryption key code corresponding to the content ID included in the message is selected from the decryption key DB 27d and included in the decryption key message together with the content ID and usage type information in the in-vehicle device 410. Distribute (step S5). At this time, the content server 210 also updates the distribution history 27c (step S6) and transmits distribution history update data to the billing server 250 (step S7). When the accounting server 250 receives the distribution history update data, the accounting server 250 updates the accounting information DB 36b. When receiving the decryption key message from the content server 210, the in-vehicle device 410 updates the library information 7b with the information included therein.

  FIG. 11 shows an operation sequence related to EPG acquisition in the radio reception mode of the in-vehicle device 410.

  When the user performs an EPG display operation via the operation unit 6 during radio reception in the in-vehicle device 410 (step S10), the in-vehicle device 410 responds with an EPG distribution request message including the mobile station ID in response to the content server 210. (Step S11).

  Upon receiving this EPG distribution request message, the content server 210 performs authentication based on the mobile station ID included therein (step S12). If this authentication is successful, the EPG data 27b is distributed to the vehicle-mounted device 410 (step S13). Receiving this, the vehicle-mounted device 410 displays the EPG on the display unit of the operation unit 6 (step S14).

  FIG. 12 is a sequence diagram showing operations in the radio reception content use mode. This operation mode starts when the user performs a predetermined radio reception content use mode selection operation during radio reception in the in-vehicle device 410.

  First, the in-vehicle device 410 issues an EPG distribution request message including a mobile station ID to the content server 210 (step S17). Upon receiving this EPG distribution request message, the content server 210 performs authentication based on the mobile station ID included therein (step S18). If this authentication is successful, for example, EPG data 27b for 24 hours from the present time is distributed to the vehicle-mounted device 410 (step S19).

  The in-vehicle device 410 searches the content DB 7c with the song name described in the received EPG (step S20). Then, with reference to the library information 7b, a piece of music that has not been obtained a decryption key is selected from the searched music pieces (step S21). As shown in FIG. 4, if the usage type is the trial listening type, it can be determined that the decryption key has not been acquired. Alternatively, if the decryption key is the initial value 0xffff, it can be determined that the decryption key has not been acquired. Then, a decryption key distribution request message is issued to the content server 210 for the content for which the decryption key has not been acquired (step S22). At this time, the usage type included in the decryption key distribution request message is, for example, a one-day type.

  Upon receiving this decryption key distribution request message, the content server 210 performs authentication based on the mobile station ID included therein (step S23). If this authentication is successful, the content server 210 sends the corresponding decryption key to the in-vehicle device 410. Distribute (step S24).

  Thereafter, the broadcast program in which the song for which the decryption key has not been acquired selected in step S21 is on air is received (step S25). In the subsequent step S26, it is checked whether the scheduled on-air time (start time in the sub-data in FIG. 6) of the song for which the decryption key has not been acquired (or a time before the predetermined time) has been reached. When that time comes, the process proceeds to step S27, where the content selected in step S21 is decrypted using the decryption key received in step S24 and reproduced by MPEG decoding. That is, at this time, instead of playing a radio broadcast song, the song in the content DB 7c is decoded and reproduced. When reproducing music from the content DB 7c, there is no need to worry about deterioration in sound quality due to a decrease in reception sensitivity or the like as in radio broadcasting. This also has the effect of effectively using the content in the content DB 7c.

  In step S28, the library information 7b is updated (increment of the number of reproductions) in accordance with the reproduction of the content in step S27. When the reproduction of the content in step S27 is thus completed, the radio program is played again. If there is a song that is scheduled to be on-air among the songs selected in step S21 (step S29, Yes), the process returns to step S26 and the process is repeated.

  In the above example, the usage type of the decryption key distributed in step S24 is the one-day type. This is because after that it is not known whether the user really wants to purchase the song. Therefore, when the user wishes to purchase the song, it is preferable that the user can perform a purchase operation with a longer-term usage type during playback of the song. Thereby, for example, purchase of a new song that can be known from a broadcast program can be decided at the earliest timing while listening.

  Incidentally, it is also possible to adopt a configuration in which the content server 210 is checked for arrival of the scheduled on-air time in step S26 or step S29. FIG. 13 shows a sequence diagram when this configuration is adopted. Since the content of each processing step itself is the same as that of FIG. 12, the same reference number is attached | subjected to the same processing step. The difference from FIG. 13 is that the content server 210 that has received the decryption key distribution request message in step S22 and has completed the authentication process in step S23 checks the arrival of the scheduled on-air time in steps S26 and S29. . In step S <b> 26, when the scheduled on-air time of a song for which a decryption key has not been acquired (or a time before that), the content server 210 issues a decryption key to the in-vehicle device 410. Upon receiving this, the in-vehicle device 410 immediately decrypts the content selected in step S21 using the decryption key and reproduces it by performing MPEG decoding. The content server 210 returns to step S26 and repeats the process when there is a piece of music selected in step S21 that is scheduled to be on-air thereafter (step S29, Yes).

  According to this processing form, since the decryption key is sent from the content server 210 in synchronization with the on-air time of the song on the radio broadcast, the in-vehicle device 410 decodes the song in the content DB 7c instead of playing the song on the radio broadcast.・ Can be played. This can also provide high-quality sound reproduction.

  In the above-described embodiment, in step S19, EPG data 27b for 24 hours from the present time is distributed to the vehicle-mounted device 410. However, for a longer period of time (one day or more ahead, for example one Weekly) EPG data may be distributed together. The same effect can be obtained by this. Further, the in-vehicle device 410 collectively receives the long-term EPG data, so that the decryption key distribution request processing in step S22 can be omitted when the radio reception content usage mode is executed again.

  Further, the content server 210 records the decryption key on the CD-ROM using the CD-ROM reader / writer 28 instead of distributing the decryption key online to the in-vehicle device 410 via the mobile communication network 300 in step S24. However, it may be delivered offline to the vehicle-mounted device 410 (or the user's address). For example, this is useful in the case where EPG data for a longer period (for example, one week) is delivered together.

  By the way, in above-mentioned embodiment, when the music described in EPG does not exist in content DB7c in step S20, the music will be played by radio broadcasting as usual. However, this may be added to the content DB 7c as a new song before the radio broadcast is on air, and the song may be reproduced from the content DB 7c in accordance with the radio broadcast on air. At that time, the new song may be supplied on the terrestrial digital broadcast wave, or may be supplied via the mobile communication network 300 depending on the amount of data such as the number of songs being small. Or you may receive provision with CD-ROM offline. These options are preferably configured so that the user can select them.

  However, when new songs are added to the content DB 7c in this way, it is necessary to deal with the capacity shortage of the HDD 7. As one of the countermeasures, for example, when the remaining storable capacity of the HDD 7 becomes a predetermined value or less, a warning is displayed to the user and the number of reproductions of the library information 7b (see FIG. 4) is checked. For content whose number of reproductions does not reach a predetermined threshold, it is preferable to delete them.

  In the above description, as a preferred embodiment, the in-vehicle device searches for a piece of music key that has not been obtained, and requests the content server to deliver the decryption key of the searched piece content. However, this search and request is not indispensable. Regardless of whether or not the in-vehicle device has acquired the decryption key of the music, it is suitable for the time when the EPG data is distributed to the in-vehicle device or on the air of the broadcast program. You may make it distribute the decryption key of the music to a vehicle equipment. Further, the decryption key usage type may be reproducible only during the on-air period.

  The radio broadcast in the above-described embodiment may be a pay broadcast or a free broadcast. In the case of a free broadcast, for example, it is conceivable that advertisement data is added to the EPG data shown in FIG. 6 and distributed, and the liquid crystal display (car navigation screen is added while listening to the music by adding the advertisement data in parallel with the music data. The advertisement screen may be displayed on the screen, or advertisement data may be inserted between the songs to listen to the music while listening to the music.

  Moreover, in the above-described embodiment, the example in which the music content is played back by the in-vehicle device of the automobile is exemplified, but the present invention is not limited to the in-vehicle device of the automobile, but is applied to a mobile station such as a railroad, a ship, an airplane, or the home. It can also be applied to fixed facilities such as stores and stores, or mobile terminals such as mobile phones and mobile audio devices. Further, the content to be provided is not limited to music but may be other content such as video.

1 is a diagram illustrating an overall configuration of an information reproduction system according to an embodiment. It is a block diagram which shows the structure of the vehicle equipment in embodiment. It is a figure which shows the example of a data structure of content DB in embodiment. It is a figure which shows the example of a data structure of the library information in embodiment. It is a block diagram which shows the structure of the content server in embodiment. It is a figure which shows the example of a data structure of EPG data in embodiment. It is a figure which shows the example of a data structure of the distribution history in embodiment. It is a figure which shows the example of a data structure of decryption key DB in embodiment. It is a block diagram which shows the structure of the accounting server in embodiment. It is a sequence diagram which shows the operation | movement which concerns on the scene of content trial listening-purchase in the content listening mode of the vehicle equipment in embodiment. It is a sequence diagram which shows the operation | movement which concerns on EPG acquisition in the radio reception mode of the vehicle equipment in embodiment. It is a sequence diagram which shows the operation | movement in the radio reception content utilization mode in embodiment. It is a sequence diagram which shows the modification of the operation | movement shown in FIG.

100: broadcast station 101: broadcast station server 102: broadcast antenna 200: content provider 210: content server 250: billing server 300: mobile communication network 301: base station 400: automobile 410: in-vehicle device (mobile station)
420: First antenna 430: Second antenna

Claims (11)

Broadcast receiving means for receiving a broadcast program;
Storage means for storing a plurality of contents each encrypted with a different encryption key;
Before receiving the broadcast program, broadcast information obtaining means for obtaining broadcast program information specifying the content scheduled to be aired in the broadcast program and the scheduled broadcast time of the content;
Search means for searching whether the content specified in the broadcast program information is stored in the storage means;
Decryption key receiving means for receiving the decryption key transmitted by the management server;
A decoding means for performing decoding of the content by using the decryption key received by the pre-Symbol decryption key reception means,
Content reproducing means for reproducing the content decoded by the decoding means in synchronization with the broadcast program based on the broadcast program information ;
A selection means for allowing a user to select which medium to acquire the content when the content specified in the broadcast program information does not exist in the storage means as a result of the search by the search means;
If the content specified in the broadcast program information does not exist in the storage means and is not acquired, broadcast reproduction means for reproducing the broadcast received by the broadcast reception means instead of the content reproduction;
An information reproducing apparatus comprising: Broadcast receiving means for receiving a broadcast program;
Storage means for storing a plurality of contents each encrypted with a different encryption key , and a decryption key corresponding to the contents purchased by the user among the plurality of contents ;
Before receiving the broadcast program, broadcast information obtaining means for obtaining broadcast program information specifying the content scheduled to be aired in the broadcast program and the scheduled broadcast time of the content;
Search means for searching for content specified in the broadcast program information , stored in the storage means, and for which the decryption key of the content has not been acquired;
Request means for requesting the management server to deliver a decryption key of the content searched by the search means;
Decryption key receiving means for receiving a decryption key transmitted in response to the request by the management server;
Using the decryption key received by the pre-Symbol decryption key reception means, a decoding means for performing decoding of the retrieved the content by the searching means,
Content reproducing means for reproducing the content decrypted by the decrypting means in synchronization with the information of the broadcast program based on the broadcast program information ;
An information reproducing apparatus comprising:   The decryption key receiving means receives the decryption key from the management server in synchronization with a timing when the content scheduled to be aired on the broadcast program is received while the broadcast program is being received by the broadcast receiving means. The information reproducing apparatus according to claim 1 or 2, characterized in that:   4. The search unit according to any one of claims 1 to 3, wherein the search unit collectively searches for contents scheduled to be on-air by broadcasting for a predetermined period more than one day ahead and stored in the storage unit. An information reproducing apparatus according to claim 1. 2. The apparatus according to claim 1, further comprising means for acquiring the content and additionally storing it in the storage means before the broadcast program is on-air when the user makes a selection using the selection means. Information playback device.   The storage means further comprises means for deleting contents stored in the storage means whose number of reproductions does not reach a threshold value when a storable remaining amount becomes a predetermined value or less. The information reproducing apparatus according to claim 5. The request unit is configured to further request the management server to distribute a decryption key that permits the reproduction of the content for a longer period during the reproduction of the content by the reproduction unit. The information reproducing apparatus according to claim 2 . A control method for an information reproducing apparatus, comprising: broadcast receiving means for receiving a broadcast program; and storage means for storing a plurality of contents each encrypted with a different encryption key,
Before receiving the broadcast program, a broadcast information obtaining step of obtaining broadcast program information specifying content scheduled to be on-air in the broadcast program and scheduled broadcast time of the content;
A search step for searching whether the content specified by the broadcast program information is stored in the storage means;
A decryption key receiving step for receiving the decryption key transmitted by the management server;
A decoding step of performing decoding of the content by using the decryption key received in the previous SL decryption key reception step,
A content playback step of playing back the content decoded in the decoding step in synchronization with the broadcast program based on the broadcast program information ;
As a result of the search in the search step, when the content specified in the broadcast program information does not exist in the storage means, a selection step that allows the user to select by which medium the content is acquired;
If the content specified in the broadcast program information does not exist in the storage means and is not acquired, a broadcast reproduction step of reproducing the broadcast received by the broadcast reception means instead of the content reproduction;
A method for controlling an information reproducing apparatus, comprising: Broadcast receiving means for receiving a broadcast program, a plurality of contents each encrypted with a different encryption key , and a storage means for storing a decryption key corresponding to the content purchased by the user among the plurality of contents. A method for controlling an information reproducing apparatus, comprising:
Before receiving the broadcast program, a broadcast information obtaining step of obtaining broadcast program information specifying content scheduled to be on-air in the broadcast program and scheduled broadcast time of the content;
A search step for searching for the content specified in the broadcast program information , which is stored in the storage means, and for which the decryption key of the content has not been acquired;
A requesting step for requesting the management server to deliver a decryption key of the content searched in the searching step;
Receiving a decryption key transmitted by the management server in response to the request;
Using the decryption key received in the previous SL decryption key receiving step, a decoding step of performing decoding of the contents searched by said searching step,
A content reproduction step of reproducing the content decoded in the decoding step in synchronization with the information of the broadcast program based on the broadcast program information ;
A method for controlling an information reproducing apparatus, comprising: A control program for controlling an information reproducing apparatus comprising broadcast receiving means for receiving a broadcast program and storage means for storing a plurality of contents each encrypted with a different encryption key,
Before receiving the broadcast program, a broadcast information obtaining step of obtaining broadcast program information specifying content scheduled to be on-air in the broadcast program and scheduled broadcast time of the content;
A search step for searching whether the content specified by the broadcast program information is stored in the storage means;
A decryption key receiving step for receiving the decryption key transmitted by the management server;
A decoding step of performing decoding of the content by using the decryption key received in the previous SL decryption key reception step,
A content playback step of playing back the content decoded in the decoding step in synchronization with the broadcast program based on the broadcast program information ;
As a result of the search in the search step, when the content specified in the broadcast program information does not exist in the storage means, a selection step that allows the user to select by which medium the content is acquired;
If the content specified in the broadcast program information does not exist in the storage means and is not acquired, a broadcast reproduction step of reproducing the broadcast received by the broadcast reception means instead of the content reproduction;
Including a program code for causing the information reproducing apparatus to execute the program. Broadcast receiving means for receiving a broadcast program, a plurality of contents each encrypted with a different encryption key , and a storage means for storing a decryption key corresponding to the content purchased by the user among the plurality of contents. A control program for controlling an information reproducing device,
Before receiving the broadcast program, a broadcast information obtaining step of obtaining broadcast program information specifying content scheduled to be on-air in the broadcast program and scheduled broadcast time of the content;
A search step for searching for the content specified in the broadcast program information , which is stored in the storage means, and for which the decryption key of the content has not been acquired;
A requesting step for requesting the management server to deliver a decryption key of the content searched in the searching step;
Receiving a decryption key transmitted by the management server in response to the request;
Using the decryption key received in the previous SL decryption key receiving step, a decoding step of performing decoding of the contents searched by said searching step,
A content reproduction step of reproducing the content decoded in the decoding step in synchronization with the information of the broadcast program based on the broadcast program information ;
Including a program code for causing the information reproducing apparatus to execute the program.

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