JP2015207327A - Content processing device, method, program and system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a content processing device, method, program and system that can shorten a time required for grasping a content of data on a reproduction object.SOLUTION: A content processing device 1 comprises: a content identification unit 11 that identifies respective data formats of a plurality of pieces of content data serving as a reproduction object; a decryption information acquisition unit 12 that acquires decryption information for decrypting meta information indicative of a content of content data from a portable terminal device 100 when a data format identified by the content identification unit 11 is not reproductionable; a meta information acquisition unit 13 that decrypts and acquires the meta information indicative of the content of the content data on the basis of the decryption information acquired by the decryption information acquisition unit 12; and a content list preparation unit 14 that displays the meta information acquired by the meta information acquisition unit 13.

Description

  The present invention relates to a content processing apparatus, method, program, and system for reproducing a plurality of content data having a plurality of types of data formats.

  Conventionally, when content data in a non-reproducible data format is input, the content data in a reproducible data format is acquired by requesting the conversion server to convert the data format of this content data. A conversion system is known (see, for example, Patent Document 1). In addition, when a data format that cannot be played back is selected, a playback system that acquires a data format conversion program necessary for converting the data format into a playable data format from a conversion server is known. (For example, see Patent Document 2).

JP 2006-129468 A JP 2004-208057 A

  When music data is considered as content data to be reproduced, music data in a data format that cannot be reproduced by using the conversion system disclosed in Patent Document 1 or the reproduction system disclosed in Patent Document 2 described above. Can be played.

  By the way, when a plurality of music data is stored in a memory or the like and one of them is selected for reproduction, the contents of each music data (for example, artist name, album name, You need to know the name of the song. However, in the conversion system disclosed in Patent Document 1 described above, the content of the content data is not received until the device (conversion-compatible client) sends the content data to the conversion server and receives the content data in a reproducible data format. There is a problem that it cannot be grasped and it takes time to grasp the contents of the user, and if this data is not selected, the entire reproducible data acquired may be wasted.

  In the reproduction system disclosed in Patent Document 2 described above, a data format conversion program is acquired from a conversion server. However, since it is for converting the data format of the entire data to be reproduced, The capacity of this program is large, and there is a problem that it takes time until the user grasps the content of the reproduction target data after acquiring this program. Further, when this data is not selected, there is a problem that the acquired data conversion program may be wasted.

  The present invention was created in view of the above points, and its purpose is to reduce the time required for grasping the contents of data to be played back, and waste of acquired data when it is not designated as a playback target. It is an object to provide a content processing apparatus, method, program, and content processing system that can be reduced.

  In order to solve the above-described problems, the content processing apparatus of the present invention includes a content identification unit that identifies each data format of a plurality of content data to be reproduced, and a data format identified by the content identification unit is not reproduced. If possible, the content data based on the decryption information acquisition means for acquiring the decryption information necessary for decrypting the meta information indicating the content data content from the external device, and the decryption information acquired by the decryption information acquisition means Meta information acquisition means for decoding and acquiring meta information indicating the contents of the information, and content display means for displaying the meta information acquired by the meta information acquisition means.

  The content processing system of the present invention includes a content processing device and an external device connected to each other. The content processing device includes a content identification unit that identifies each data format of a plurality of content data to be reproduced, and the content data content when the data format identified by the content identification unit is not reproducible. Based on the decryption information acquisition means for acquiring the decryption information necessary for decrypting the meta information indicating from the external device and the decryption information acquired by the decryption information acquisition means, the meta information indicating the content data is decrypted and acquired. Meta information acquisition means and content display means for displaying meta information acquired by the meta information acquisition means. The external device includes decryption information providing means for providing corresponding decryption information to the content processing device when the content processing device requests transmission of the decryption information.

  The content processing method of the present invention includes a step of identifying each data format of a plurality of content data to be reproduced by a content identification unit, and a case where the data format identified by the content identification unit is not reproducible. A step of acquiring decryption information necessary for decoding the meta information indicating the contents of the content data from the external device by the decryption information acquisition means, and the content by the meta information acquisition means based on the decryption information acquired by the decryption information acquisition means Decoding and acquiring meta information indicating the content of data, and displaying the meta information acquired by the meta information acquiring means by the content display means.

  In the content processing program of the present invention, when a computer identifies a data format of each of a plurality of content data to be reproduced, and the data format identified by the content identification unit is not reproducible In addition, decoding information acquisition means for acquiring decoding information necessary for decoding the meta information indicating the contents of the content data from an external device, and meta information indicating the contents of the content data based on the decoding information acquired by the decoding information acquisition means Meta-information acquisition means that decodes and acquires the information, and content display means for displaying the meta-information acquired by the meta-information acquisition means.

  In the present invention, when there is content data in a data format that cannot be reproduced, the decryption information necessary for decrypting the meta information indicating the content data is obtained from the external device and the meta information is decrypted. In general, the storage location of meta information included in content data is determined for each data format, and the amount of decryption information required to acquire meta information is small. For this reason, compared with the case where content data is converted into a reproducible data format or the case where this conversion program is acquired, the time required for grasping the content data can be shortened.

  Further, it is desirable that the content identification means described above identifies the data format of the content data recorded on the recording medium when the recording medium is connected or loaded. This makes it possible to grasp the contents of each content included in the newly connected or loaded recording medium in a short time.

  Further, it is desirable that the content display means described above displays a part or all of the meta information in a list format for each content data. This makes it possible to compare the contents that can be reproduced.

  In addition, a content selection unit that selects a content to be reproduced from the content whose meta information is displayed by the content display unit described above, and a content that is read and reproduced from the content data corresponding to the content selected by the content selection unit It is desirable to further include a reproducing means. Accordingly, it is possible to select and reproduce the content desired to be reproduced after confirming the content of each content regardless of whether or not the reproduction can be performed only by the own apparatus.

  In addition, when the data format of the content selected by the content selection unit described above is not reproducible, the content is acquired from the external device by specifying the content and converting the content data into a reproducible data format It is desirable to further include data acquisition means. As a result, even when content in a data format that cannot be reproduced is selected, this content can be reproduced. In addition, since the data format is converted for the content after being selected as a playback target, it is possible to reduce the waste of acquired data without wastefully acquiring data for content that is not selected as a playback target.

It is a figure which shows the detailed structure of the content processing apparatus contained in the content processing system of one Embodiment. It is a figure which shows the whole structure of a content processing system, and the detailed structure of a portable terminal device. It is a flowchart which shows the operation | movement procedure of a content processing apparatus. It is a flowchart which shows the operation | movement procedure of a portable terminal device. It is a figure which shows the specific example of the meta information contained in content data.

  Hereinafter, a content processing system according to an embodiment to which the present invention is applied will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a detailed configuration of a content processing apparatus included in a content processing system according to an embodiment. This content processing apparatus is mounted on a vehicle, for example. As shown in FIG. 1, the content processing apparatus 1 includes a control unit 10, a USB (Universal Serial Bus) interface unit (USB I / F) 20, an SD (Secure Digital) interface unit (SD I / F) 26, a content list. A storage unit 30, a content data storage unit 32, an audio processing unit 40, an amplifier 42, a display processing unit 50, and an operation unit 60 are provided.

  The control unit 10 controls the entire content processing apparatus 1 and is realized by a configuration as a computer that executes a predetermined program stored in a ROM or a RAM by a CPU. The USB interface unit 20 is for inputting / outputting USB format signals to / from the mobile terminal device 100, and includes at least one USB port and a USB host controller.

  The SD interface unit 26 is for inputting and outputting signals to and from an SD memory card 28 as an external recording medium, and includes one SD card slot and an SD host controller. Content data such as music data is recorded in the SD memory card 28.

  The content list storage unit 30 stores a content list including meta information indicating the contents of a plurality of content data recorded on the SD memory card 28. The content data storage unit 32 stores the converted content data when the result of converting content data in a data format that cannot be reproduced into a data format that can be reproduced is sent from the mobile terminal device 100.

  The audio processing unit 40 is for playing back (sound output) content data read from the SD memory card 28 or the content data storage unit 32. For example, decoding processing specific to various data formats is performed by the control unit 10, and PCM (Pulse Code Modulation) data is input to the audio processing unit 40. The audio processing unit 40 converts input PCM data into an analog audio signal. This audio signal is amplified by the amplifier 42 and output from the speaker 44. In practice, audio signals having two or more channels are reproduced and output, but in the configuration shown in FIG. 1, one amplifier 42 and one speaker 44 are shown in a simplified manner. .

  The display processing unit 50 reproduces (displays video) the content data read from the SD memory card 28 or the content data storage unit 32, and displays a content list generated by the control unit 10 and other control information. Is. For example, decoding processing specific to various data formats is performed by the control unit 10, and RGB data is input to the display processing unit 50. The display processing unit 50 converts input RGB data into a predetermined video signal. This video signal is input to the display device 52 and the video of the content is displayed.

  The operation unit 60 is for accepting various operations by the user, and includes various switches and operation knobs. Note that the operation unit 60 may be configured by using a touch panel arranged on the screen of the display device 52, or the operation unit may be configured by using a remote control unit or the like.

  Next, the control unit 10 will be described. As shown in FIG. 1, the control unit 10 includes a content identification unit 11, a decryption information acquisition unit 12, a meta information acquisition unit 13, a content list creation unit 14, a content selection unit 15, a content data acquisition unit 16, and a content reproduction unit 17. It is comprised including.

  The content identification unit 11 identifies the data format of content data recorded on the SD memory card 28 when the SD memory card 28 is connected to the SD interface unit 26. When the data format identified by the content identification unit 11 is unreproducible, the decryption information acquisition unit 12 acquires the decryption information necessary for decoding the meta information indicating the content data content from the portable terminal device 100. To do. The meta information acquisition unit 13 decodes and acquires meta information indicating the content data based on the decoding information acquired by the decoding information acquisition unit 12.

  The content list creation unit 14 creates and displays a content list including the meta information acquired by the meta information acquisition unit 13. This content list is for displaying part or all of the meta information in a list format for each content. The content selection unit 15 selects content to be reproduced from the content whose meta information is displayed by the content list creation unit 14 according to a user's operation instruction performed using the operation unit 60.

  When the data format of the content designated to be reproduced is unreproducible, the content data acquisition unit 16 specifies the content data converted into a reproducible data format from the portable terminal device 100. get. The content data after the data format conversion is stored in the content data storage unit 32.

  The content reproduction unit 17 reads and reproduces content data corresponding to the content selected by the content selection unit 15. Specifically, content data in a reproducible data format is read from the SD memory card 28. For content data in an unreproducible data format, the content data after being converted into a reproducible data format is read from the content data acquisition unit 16.

  FIG. 2 is a diagram showing an overall configuration of the content processing system and a detailed configuration of the mobile terminal device 100. A mobile terminal device 100 shown in FIG. 2 is generally called a smartphone, and has functions of a mobile phone and a mobile information terminal. The portable terminal device 100 includes a control unit 112, an operation unit 114, a display unit 116, a telephone processing unit 118, and a USB interface unit (USB I / F) 120.

  The control unit 112 is for controlling the entire portable terminal device 100, and is realized by a configuration as a computer that executes a predetermined program stored in a ROM or a RAM by a CPU. The operation unit 114 includes a numeric keypad, other keys, and various switches, and accepts user operation instructions and various inputs. Using the operation unit 114 configured with a touch panel, the user may point the numeric keypad displayed on the screen with a finger or the like.

  The display unit 116 is configured by an LCD (Liquid Crystal Display) or the like, and displays operation contents using the operation unit 114, control contents and processing contents by the control unit 112, and the like. The telephone processing unit 118 performs processing as a mobile phone. For example, the telephone processing unit 118 performs outgoing / incoming processing with a base station to perform telephone call processing, Internet connection processing, and the like. Various data exchanges with the content processing server 200 are performed via the telephone processing unit 118.

  The USB interface unit 120 is for inputting and outputting signals between the portable terminal device 100 as a USB device (target) and the content processing device 1 as a USB host, and includes a USB target controller.

  Next, the control unit 112 will be described. As shown in FIG. 2, the control unit 112 includes a decryption information providing unit 112A and a data format conversion unit 112B. When the decryption information providing unit 112A is requested by the content processing apparatus 1 to transmit the decryption information necessary for decrypting the meta information included in the content data together with the content data, the decryption information corresponding to the data format of the content data Is provided to the content processing apparatus 1. For example, the decryption information for each data format is stored in advance in a memory (not shown), and the decryption information providing unit 112A reads the corresponding decryption information and sends the USB interface unit to the content processing apparatus 1 that has requested transmission. 120 for transmission.

  The data format conversion unit 112B converts the data format of the content data into a data format that can be played back by the content processing device 1 when the content processing device 1 requests conversion of the data format together with the content data (for example, playback is possible). Information specifying the correct data format is included in the data format conversion request), and the process of transmitting the converted content data to the content processing apparatus 1 is performed. For example, a codec (conversion program) for each data format is stored in advance in a memory (not shown), and the data format conversion unit 112B reads the corresponding codec and performs conversion processing on the content requested for conversion. Then, the result is transmitted to the content processing apparatus 1 via the USB interface unit 120.

  The content identification unit 11 is the content identification unit, the decryption information acquisition unit 12 is the decryption information acquisition unit, the meta information acquisition unit 13 is the meta information acquisition unit, the content list creation unit 14 is the content display unit, and the content selection unit. Reference numeral 15 corresponds to a content selection unit, the content data acquisition unit 16 corresponds to a content data acquisition unit, and the content reproduction unit 17 corresponds to a content reproduction unit. The decryption information providing unit 112A corresponds to decryption information providing means.

  The content processing system of the present embodiment has such a configuration, and the operation will be described next.

  FIG. 3 is a flowchart showing an operation procedure of the content processing apparatus 1. The content identification unit 11 determines whether or not the SD memory card 28 is connected to the SD interface unit 26 (step 100). If not connected, a negative determination is made and this determination is repeated. If the SD memory card 28 is connected, an affirmative determination is made in step 100.

  Next, the content identification unit 11 identifies the data format of each of the plurality of content data recorded on the SD memory card 28 (step 102). The data format can be identified based on, for example, a file identifier of content data. Further, the content identification unit 11 determines whether or not there is content of a type (data format) that cannot be reproduced based on the identification result of the data format (step 104). If there is content that cannot be reproduced, an affirmative determination is made, and the decryption information acquisition unit 12 sends the content that cannot be reproduced to the mobile terminal device 100 and requests acquisition of decryption information that decrypts the meta information included in the content (Step 106). Thereafter, the decryption information acquisition unit 12 determines whether or not the decryption information of the meta information has been received from the mobile terminal device 100 (step 108). If not received, a negative determination is made and this determination is repeated.

  When the decryption information is received, an affirmative determination is made in the determination of step 108. Further, the decryption information acquisition unit 12 determines whether there is another content for which the decryption information cannot be acquired (step 110). If there are other types of content that cannot be reproduced, an affirmative determination is made, and the processing returns to step 106 and the operations after the request for obtaining the decryption information are repeated.

  If there is no other content that cannot be reproduced, a negative determination is made in step 110. Next, the meta information acquisition unit 13 decodes the meta information of each content using the acquired decoding information, and the content list creation unit 14 creates a content list including the meta information acquired by the meta information acquisition unit 13. Are displayed (step 112). Specifically, part or all of the acquired meta information is displayed on the display device 52 in a list format for each content. In addition, when a plurality of contents recorded in the SD memory card 28 include contents in a data format that can be played back by the codec of the content processing apparatus 1 itself, the meta data of the contents acquired using this codec Information is also included.

  Next, the content selection unit 15 determines whether or not the content to be played back has been selected in response to the user's operation instruction (step 114). If it is not selected, a negative determination is made, and the process returns to step 112 and the meta information list display is repeated. If any content is selected, an affirmative determination is made in step 114. Next, the content data acquisition unit 16 determines whether or not the selected content can be reproduced (step 116). If playback is possible, an affirmative determination is made, and the content playback unit 17 plays back the selected content (step 118).

  If the selected content cannot be reproduced (in the case of a data format that cannot be reproduced), a negative determination is made in the determination of step 116. Next, the content data acquisition unit 16 transmits the unreproducible content to the mobile terminal device 100 and requests conversion to a reproducible data format (step 120). Thereafter, the content data acquisition unit 16 determines whether or not content data whose data format has been converted has been received (step 122). If it has not been received, a negative determination is made and this determination is repeated. When the content data after the data format conversion is received, an affirmative determination is made in the determination of step 120. The received content data is stored in the content data storage unit 32. Thereafter, after step 118, the content is reproduced using the received content data. When the reproduction of the content ends, the process returns to step 112 and the operations after the content list display are repeated.

  FIG. 4 is a flowchart showing an operation procedure of the mobile terminal device 100. The decryption information providing unit 112A determines whether or not a decryption information acquisition request has been received from the content processing apparatus 1 (step 200). If this request is made by the decryption information acquisition unit 12 in the operation of step 106 shown in FIG. 3, an affirmative determination is made. Next, the decryption information providing unit 112A identifies decryption information necessary for decrypting the meta information of the content based on the content data sent together with this request (step 202) and transmits it to the content processing apparatus 1 (step) 204). Thereafter, the process returns to step 200, and the determination on the presence / absence of the request for obtaining the decryption information is repeated.

  If there is no request for obtaining decryption information, a negative determination is made in the determination of step 200. Next, the data format conversion unit 112B determines whether or not there is a data format conversion request from the content processing apparatus 1 (step 206). If this request is made by the content data acquisition unit 16 in the operation of step 120 shown in FIG. 3, a positive determination is made. Next, the data format conversion unit 112B converts the data format of the content data sent together with this request into the designated data format (step 208), and converts the content data in the converted data format to the content processing apparatus 1. (Step 210). After that, or when there is no data format conversion request, a negative determination is made in step 206, and then the process returns to step 200 to repeat the determination of whether or not there is a request for obtaining decryption information.

  FIG. 5 is a diagram illustrating a specific example of meta information included in content data. The content data of the MP3 audio file shown in FIG. 5 includes an MP3 header, audio data, and an ID3 tag. Among these, the ID tag is meta information indicating the content. The ID3 tag includes a song name, artist name, album name, and the like indicating the contents of the audio data. The position of the ID3 tag is determined in advance, and the decoding information for reading the contents of the ID3 tag can be created with very little data compared to the codec of the MP3 audio file. Note that the content data other than the MP3 audio file also includes the same meta information (the content and type differ depending on the data format, and do not necessarily include the same meta information as the MP3 audio file described above. ) And can be read out from the content data using the decryption information corresponding to each data format.

  As described above, in the content processing apparatus 1 according to the present embodiment, when there is content data in a data format that cannot be reproduced, the decryption information necessary for decrypting the meta information indicating the content data is acquired from the mobile terminal device 100 and the meta data is obtained. Decoding information. In general, the storage location of meta information included in content data is determined for each data format, and the amount of decryption information required to acquire meta information is small. For this reason, compared with the case where content data is converted into a reproducible data format or the case where this conversion program is acquired, the time required to grasp the content data can be shortened.

  Further, when the SD memory card 28 is connected, the data format of the content data recorded on the SD memory card 28 is identified, and each content included in the newly connected SD memory card 28 is briefly The contents can be grasped at time. Further, by displaying a part or all of the meta information in a list format for each content data, it is possible to compare the contents of contents that can be reproduced. In addition, it is possible to select and reproduce the content desired to be reproduced after confirming the content of each content regardless of whether or not it can be reproduced only by the own apparatus.

  Further, when the data format of the content selected as the reproduction target is unreproducible, the content data converted to the reproducible data format by specifying this content is acquired from the mobile terminal device 100. . As a result, even when content in a data format that cannot be reproduced is selected, this content can be reproduced. In addition, since the data format is converted for the content after being selected as a playback target, it is possible to reduce the waste of acquired data without wastefully acquiring data for content that is not selected as a playback target.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in the above-described embodiment, the data format is identified for the content data recorded on the SD memory card 28 when the SD memory card 28 is connected to the SD interface unit 26. The data format is intended for recording media other than 28, for example, content data recorded on a USB memory connected to the USB interface unit 20 or a CD, CD-R, DVD, DVD-R, etc. loaded in a disk drive. Identification may be performed.

  In the above-described embodiment, the content processing device 1 and the mobile terminal device 100 are connected via USB. However, the Bluetooth (registered trademark) connection may be established between the content processing device 1 and the mobile terminal device 100 or a wireless LAN may be used. .

  In the above-described embodiment, content data is sent when a request for obtaining decryption information is sent from the content processing device 1 to the mobile terminal device 100. However, the content data format may be specified instead. . For example, the data format can be specified based on the file extension of the content data.

  In the above-described embodiment, the mobile terminal device 100 transmits the decryption information and converts the data format of the content data. However, these processes may not be performed for all data formats. In such a case, that is, when there is no decryption information or data format conversion program, the portable terminal device 100 requests the content processing server 200 to transmit such information and program, and obtains necessary information and the like. You may make it do. Also, the content processing server 200 has the functions of the decryption information providing unit 112A and the data format conversion unit 112B of the mobile terminal device 100, and the content processing device 1 requests the content processing server 200 to transmit decryption information. You may make it request | require data format conversion of content data.

  In the above-described embodiment, the content processing apparatus 1 mounted on a vehicle has been described. However, the present invention can also be applied to a content processing apparatus that is used outside a vehicle, for example, indoors or outdoors.

  As described above, according to the present invention, when there is content data in a data format that cannot be reproduced, the decryption information necessary for decrypting the meta information indicating the content is obtained from the external device and the meta information is decrypted. Therefore, compared with the case where the content data is converted into a reproducible data format or the case where this conversion program is acquired, the time required for grasping the content data can be shortened.

DESCRIPTION OF SYMBOLS 1 Content processing apparatus 10, 112 Control part 11 Content identification part 12 Decoding information acquisition part 13 Meta information acquisition part 14 Content list creation part 15 Content selection part 16 Content data acquisition part 17 Content reproduction part 20, 120 USB interface part (USB I / F)
26 SD interface (SD I / F)
28 SD memory card 30 Content list storage unit 32 Content data storage unit 40 Audio processing unit 50 Display processing unit 100 Mobile terminal device 112A Decoding information providing unit 112B Data format conversion unit

Claims (8)

Content identification means for identifying each data format of a plurality of content data to be reproduced;
When the data format identified by the content identification means is unreproducible, decryption information acquisition means for acquiring decryption information necessary for decryption of meta information indicating the content data content from an external device;
Based on the decryption information obtained by the decryption information obtaining means, meta information obtaining means for decrypting and obtaining meta information indicating the content data;
Content display means for displaying the meta information acquired by the meta information acquisition means;
A content processing apparatus comprising: In claim 1,
The content data reproducing apparatus, wherein when the recording medium is connected or loaded, the content identifying means identifies the data format of the content data recorded on the recording medium. In claim 1 or 2,
The content display device displays a part or all of the meta information in a list format for each content data. In any one of Claims 1-3,
Content selection means for selecting content to be reproduced from the contents whose meta information is displayed by the content display means;
Content reproduction means for reading and reproducing content data corresponding to the content selected by the content selection means;
The content processing apparatus further comprising: In claim 4,
Content data acquisition for acquiring content data converted into a reproducible data format by designating the content from the external device when the data format of the content selected by the content selection means is not reproducible A content processing apparatus further comprising means. A content processing system comprising a content processing device and an external device connected to each other,
The content processing apparatus includes:
Content identification means for identifying each data format of a plurality of content data to be reproduced;
When the data format identified by the content identification means is unreproducible, decryption information acquisition means for acquiring decryption information necessary for decryption of meta information indicating the content data content from an external device;
Based on the decryption information obtained by the decryption information obtaining means, meta information obtaining means for decrypting and obtaining meta information indicating the content data;
Content display means for displaying the meta information acquired by the meta information acquisition means,
The external device is
A content processing system comprising: decryption information providing means for providing the content processing device with the corresponding decryption information when the content processing device requests transmission of the decryption information. Identifying a data format of each of a plurality of content data to be reproduced by content identifying means;
When the data format identified by the content identification means is unreproducible, obtaining decryption information necessary for decrypting the meta information indicating the content data content from an external device by the decryption information obtaining means; ,
Based on the decryption information obtained by the decryption information obtaining means, the meta information obtaining means decrypts and obtains meta information indicating the content data;
Displaying meta information acquired by the meta information acquiring means by content display means;
A content processing method comprising: Computer
Content identification means for identifying each data format of a plurality of content data to be reproduced;
When the data format identified by the content identification means is unreproducible, decryption information acquisition means for acquiring decryption information necessary for decryption of meta information indicating the content data content from an external device;
Based on the decryption information obtained by the decryption information obtaining means, meta information obtaining means for decrypting and obtaining meta information indicating the content data;
Content display means for displaying the meta information acquired by the meta information acquisition means;
Content processing program to make it function.

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