JP2005293393A - Content download system, content availability display system, program, and recording medium - Google Patents

Abstract

In downloading content from a server device to a client device, useless downloading of content that cannot be used by the client device is prevented.
A client device instructs a server device to download content (step S1), and starts downloading (step S2). For example, when only predetermined N bytes of content data have been downloaded before the content download is completed (YES in step S3), the client device executes reproduction of the downloaded content (step S4). If playback is possible (YES in step S5), the download is continued (step S6) and completed (step S7). On the other hand, if reproduction is impossible (NO in step S5), the download is stopped (step S8), and the downloaded content data is discarded (step S9).
[Selection] Figure 2

Description

  The present invention relates to a content download system, a content use availability presentation system, a program, and a recording medium. More specifically, the present invention relates to a content download system that downloads content data from a server device to a client device via a network. The present invention relates to a content availability presentation system that presents the availability of content, a program used in those systems, and a recording medium that records the program and is readable by an information processing device.

  In recent years, network-type information processing devices have become widespread. Along with this, various devices are connected to each other and various data are transmitted and received. Previously, data transmission / reception using a network was mainly small, such as text data. However, with the advent of the broadband era, multimedia content data of very large size is now also transmitted / received. It has been broken.

  For example, multimedia contents on a personal computer (hereinafter abbreviated as PC) in a home LAN (Local Area Network) are downloaded to a mobile AV viewer that is also connected to the LAN, and the mobile AV viewer is taken out to Things such as enjoying media content are becoming popular.

  In such a usage scene, generally, a client device connects to a server device, selects content to be acquired, and issues an instruction to acquire the content. The server device transfers content data to the client device based on a request from the client device. The user uses the content after the download of the content data to the client device is completed. In this specification, a device that acquires and uses content from another device is called a client device, and a device that provides content is called a server device.

  However, when a general-purpose information processing device such as a PC is used as a server device for content such as multimedia content, content data may be stored in various data formats. When downloaded to a device, it may not be available on that client device.

  In order to cope with such a problem, the user or the client device conventionally confirms and determines whether or not the client device supports the data format before executing the download. Here, the storage format of the content is confirmed by a file name extension of content data, a Content-Type header of MIME (Multipurpose Internet Mail Extension), and the like.

  However, these pieces of information may differ from the actual file storage format or may not be used when determining the correspondence in the client device due to problems such as the bit rate of the content data.

  Therefore, even though content data such as very large multimedia content is downloaded over a long period of time, it cannot be used on the client device, resulting in wasted downloads and wasted time and network traffic. Has occurred.

  The present invention has been made in view of the above circumstances, and prevents content data that cannot be used by a client device from being downloaded when the content data is downloaded from the server device to the client device. It is an object of the present invention to provide a content download system, a program in the system, and a recording medium readable by an information processing device that records the program.

  Further, the present invention provides a content availability presentation system capable of presenting availability of content in a client device when downloading content data from the server device to the client device, a program in the system, and the program Another object is to provide a recording medium readable by a recorded information processing device.

The present invention is constituted by the following technical means in order to solve the above-described problems.
A first technical means is a content download comprising a server device that holds a plurality of content data, and a client device that downloads and uses content data held in the server device by connecting to the server device over a network In the system, when content data is downloaded from the server device to the client device, whether or not the content data can be used by the client device is already downloaded after the download starts and before the download ends And determining means for determining from typical content data.

  According to a second technical means, in the first technical means, the determination means is a content data determination that is provided to be executable on the client device, or is provided to the server device to be executable on the client device. The content data determination unit is configured to receive partial content data that has been downloaded so far after a predetermined time has elapsed since the start of downloading of content data from the server device or after a predetermined number of bytes have been received. It is characterized by determining whether or not it can be executed by the client device.

  The third technical means interrupts the download in the first or second technical means when the determination by the determination means determines that the content data that has started downloading cannot be used by the client device. And a continuation unit that continues the download only when it is determined by the determination by the determination unit that the content data that has started downloading can be used in the client device.

  A fourth technical means is a content availability presentation system that uses the content download system in the first or second technical means and presents the availability of content in the client device, wherein the server device is the client Based on the determination result of the determination means, the means for displaying a list of content data on the server device in response to a request from the device and whether or not the content data displayed on the list can be used by the client device are combined. And displaying means.

  The fifth technical means is a content use availability presentation system that uses the content download system in the second technical means and presents the availability of content in the client device, wherein the content data determination means is the server device. Executed on all types of content data held for download, and the server device displays a list of content data on the server device in response to a request from the client device; And a means for displaying whether or not the client device can be used in the content data to be displayed based on the determination result of the content data determination means.

  The sixth technical means is a program for causing an information processing device to function as the content download system of any one of the first to third technical means.

  The seventh technical means is a program for causing an information processing device to function as the content use availability presentation system of the fourth or fifth technical means.

  The eighth technical means is a recording medium readable by an information processing device, on which the program of the sixth or seventh technical means is recorded.

  According to the present invention, when content data is downloaded from a server device to a client device, it is possible to determine whether or not the content is usable in the client device before complete download. It is possible to prevent useless download of content. Further, according to the present invention, it is possible to reduce a network load by eliminating useless downloads and to provide a more comfortable download environment to the user.

  Further, according to the present invention, when content data is downloaded from a server device to a client device, it is possible to list whether or not the content is usable in the client device before downloading. It is possible to prevent useless download of content. Further, according to the present invention, it is possible to reduce a network load by eliminating useless downloads and to provide a more comfortable download environment to the user.

  FIG. 1 is a schematic diagram showing an example of a general network system applicable to the content download system according to the present invention, in which 1 is a server device and 2 is a client device.

  In the content download system according to the present invention (hereinafter referred to as the present system), at least when content data is downloaded, the server device 1 and the client device 2 are connected via a network as in the general connection form shown in FIG. Become connected. Here, the network may be wired or wireless, and may be a digital network such as the Internet or IEEE1394. The server device 1 holds a plurality of pieces of content data, and the client device 2 downloads and uses the desired one or more pieces of content data via the network. Here, it is assumed that the content can be partially reproduced if there is a certain amount of data without acquiring all the data, such as MPEG format or JPEG format.

  As described above, an information processing device that acquires and uses content from another device is called a client device, and an information processing device that provides content is called a server device. Here, the information processing device refers to an electronic device that can handle content, preferably an electronic device that uses multimedia content, and is represented by a computer such as a PC or a PDA (Personal Digital Assistant). However, as in the object of the present invention, it is often possible that a certain type of content cannot be handled by a certain electronic device.

  Further, the server device 1 displays a list of content data on the server device 1 in response to a request from the client device 2, and the content data selected by the client device 2 from the content data displayed in the list. Means for transmitting to the client device 2. The client device 2 is configured to request the server device 1 to display a list of content data, to display a list of content on the server device 1, and one or more of the content data displayed in the list. And a means for selecting the content.

  And this system shall be equipped with the following determination means as the characteristic. That is, when the content data is downloaded from the server device 1 to the client device 2, the determination means determines whether or not the content data can be used by the client device 2 after the download starts and before the download ends (download after the download starts). (Until the end), it is determined from the partial content data that has already been downloaded (that is, a part of all data of the content to be downloaded).

  In this system, by adopting the content download method provided with this determination means, before downloading the content from the server device 1 to the client device 2, the actual download is completed (completed). Since it is possible to determine in advance whether or not the content is usable (for example, reproducible) in the client device 2 and the user can know the result, waste that cannot be used (for example, unreproducible) in the client device 2 Therefore, it is possible to prevent unnecessary contents from being downloaded by taking measures to prevent unnecessary contents from being downloaded. Furthermore, since multimedia contents are generally very large in size, it takes a lot of time to download the content data and the network load increases. However, time is lost by eliminating unnecessary downloads as in this system. Can be prevented, the network load can be reduced, and a more comfortable download environment can be provided to the user.

  FIG. 2 is a flowchart for explaining a processing example in the content download system according to the embodiment of the present invention.

  The determination unit is preferably the next content data determination unit provided in the client device 2 so as to be executable, or provided in the server device 1 so as to be executable with respect to the client device 2, with reference to FIG. This embodiment will be described. In the form provided in the client device 2, the content data determination means is implemented as a program incorporated in the client device 2 so as to be executable, or in the form provided in the server device 1, the content data determination unit is provided in the server device 1. 2 is preferably provided as an executable program.

  The content data determination means described above is a partial content that has been downloaded so far after a predetermined time has elapsed since the start of downloading of content data from the server device 1 or after a predetermined number of bytes have been received by the client device 2. It is determined whether or not the data can be executed by the client device 2. Here, the determination as to whether or not execution is possible is performed by executing (trial) on the client device 2. For example, when the content data is audiovisual data, it is reproduced on the client device 2. It is done by trying. Each type of content can be executed by a predetermined application program. Therefore, when the application program corresponding to the content to be downloaded is not incorporated in the client device 2, the content cannot be executed.

  As an example of the operation of the client device 2 in the download method of the present embodiment, first, the user operates the content list screen of the server device 1 displayed on the client device 2 to select the content to be downloaded to the client device 2. When the content is selected, the client device 2 issues an acquisition instruction (download instruction) for the content to the server device 1 (step S1). The server device 1 that has received the content acquisition instruction starts to transfer content data to the client device 2. With this transfer start, the client device 2 starts downloading content data (step S2).

  When the download is started, a threshold value N of the size of the content data that can be partially reproduced is set in advance, and at the time of downloading N bytes of the content data (step S3), the downloaded content Is reproduced (step S4).

  Then, it is determined from the playback trial result whether the client device 2 can play back (step S5). Here, the threshold value N may be a fixed value common to all contents, or may be dynamically changed according to the bit rate of the contents data. In addition, the content reproduction (step S5) is for confirming whether reproduction is possible, and the video and audio being reproduced may or may not be presented to the user.

  Here, if the content data can be reproduced, the download may be continued as it is. If the content data cannot be reproduced, the client device 2 presents the fact, for example, by presenting the fact to the client device 2. It is necessary to see and stop the download. For example, clicking the “Cancel” button in the dialog indicating that the download is in progress. More preferably, the client device 2 executes a process of discarding this useless data.

  However, by providing the system with the next interruption means and continuation means, it is possible to automate the cancellation of the download (and the discarding of unnecessary data). The interruption unit is a unit that interrupts the download when it is determined by the determination unit that the content data that has started downloading is not usable by the client device 2. The interruption means may include means for discarding content data partially remaining in the client device 2 due to the interrupted download. Further, it is a means for continuing the download only when it is determined by the continuation means and the determination by the determination means that the content data that has been downloaded is available on the client device 2. With this form of download method, the user's trouble can be saved.

  The interruption means and the continuation means may be incorporated as a program on the client device 2 side as described in the content data determination means, but may be incorporated as a program on the server device 1 side. However, when incorporating on the server device 1 side, means for interrupting the transfer of the content data based on the determination result that it cannot be used (obtained from the client device 2 except when the server device 1 has a determination program) As another means, a program for causing the server device 1 to function may be incorporated as means for performing processing for discarding unnecessary partial download data to the client device 2. Further, when the server device 1 is incorporated on the client device 2 side, the server device 1 may include means for canceling transfer of content data in response to a download stop instruction from the client device 2.

  The processing after the step S5 will be described by adopting a form including the interruption means and the continuation means. If reproduction is possible according to the determination result (YES in step S5), the download is continued as it is (step S6), and all the contents are downloaded (step S7). On the other hand, if reproduction is impossible (NO in step S5), the download is stopped (step S8). When the download is stopped, it is preferable to delete the content data of the part that has already been downloaded (step S9).

  According to the download method of the present embodiment, content that cannot be played back by the client device 2 is automatically stopped when it is determined that playback cannot be performed, that is, when the download content specified by the user cannot be used by the client device 2. Therefore, the same effect as the download method according to the above-described embodiment can be automatically obtained without a user instruction.

  The content download system and its download method according to each embodiment as described above can be applied to the content availability presentation system described below. In addition, when using the content availability display system described here to download available content, after the availability of each content is presented (at least after the availability is determined), it has been described with reference to FIG. Such further determination is not necessary, and normal download may be executed by the user selecting content to be downloaded by the client device 2 or the like. Therefore, a content download system that employs this content availability display system can also be usefully employed in the present invention. Note that the content availability determination system described here does not require interruption means and continuation means (interruption and continuation based on determination means) as described above.

  The server device 1 has means for presenting (displaying) a list of content data on the server device 1 in response to a request from the client device 2, but in the content availability presentation system according to an embodiment of the present invention. Includes means for displaying whether or not the client device 2 can be used in the content data displayed in the list based on the determination result by the determination means (or the content data determination means which is a special form). Shall be prepared. Whether or not the client device 2 can be used is the content data to be displayed when displaying the list of content data (at least each type of content data to be displayed), even in the form of reading from the storage unit according to the embodiment described later. ), It may be determined by trial whether or not it can be used.

  In the content availability determination system according to another embodiment of the present invention, the content data determination unit is configured to be executed for all types of content data held for download in the server device 1. To do. Note that “for download” is not limited to downloading, but may be content data held in a downloadable form. Whether or not the client device 2 can be used as a result of the execution is preferably stored in the storage unit of the client device 2 in association with the content data. This storage means may use a storage device of a device (device 1 or device 2) on the side where the content data determination means is incorporated. Further, by determining whether or not the client device 2 can use all types of content data held in the server device 1 for download, the same content data can be obtained for all the content data held for download. The determination result can also be obtained from the determination result of the type of content data.

  According to the content availability presentation system according to each of the above-described embodiments, when the content list on the server device 1 is presented on the client device 2, the availability on the client device 2 of the content on the server device 1 is determined. It can also be presented to the user. Further, in these content availability indication systems, the availability can be presented regardless of whether the content is small in size and does not require much time for complete download.

  Here, as described above, a mode of presenting availability of contents in the client device 2 together with the list display will be exemplified with reference to FIGS. 3 to 5.

  FIG. 3 is a flowchart for explaining a processing example in the content use availability presentation system according to the embodiment of the present invention. 4 is a diagram showing an example of content information held in the client device in the processing example of FIG. 3, and FIG. 5 is a display example of a content list displayed on the display device in the processing example of FIG. FIG. In the figure, 3 is content information held in the client device 2, and 4 is a content list screen with playability information.

  As an example of the operation of presenting content availability to the client device 2 according to the present embodiment, first, the user gives an instruction to present a list of content managed by the server device 1 from the client device 2 ( Step S11). When the client device 2 receives the instruction from the user, the client device 2 requests the server device 1 for content information managed by the server device 1 and acquires the content information (step S12). Here, let M be the number of pieces of acquired content information.

  The content information includes, for each content, the location (for example, URL) of the content used to specify the content when the client device 2 issues a download request to the server device 1, the size of the content, and the client device 2. The title and genre used when displaying the content list are assumed. These pieces of content information only need to satisfy information necessary when the client device 2 issues a download request to the server device 1 and information necessary when the client device 2 displays a content list.

  Here, M is the number of pieces of content information acquired from the server device 1 by the client device 2. In general, the number of pieces of content information acquired from the server device 1 indicates the number of contents managed by the server device 1. For the M pieces of content information obtained from the server device 1, the client device 2 sequentially requests each piece of content from the server device 1 using the location (for example, URL) of those contents, and downloads the M pieces of content. (Steps S13 to S23). For example, i is incremented from i = 0 (step S13) (step S22), and the following processes (steps S14 to S21, S24) are executed until i = M (step S23).

  First, download of the i-th content content [i] is started (step S14), and download of content [i] is stopped until content [i] has been downloaded for N bytes (YES in step S15). (Step S16). Here, content [i] represents the i-th content (starting from 0th) acquired by the client device 2 from the server device 1. Then, the content [i] is reproduced (step S17). As described above, the download in step S14 does not completely download each content, but sets a threshold value N of the content size that can be partially reproduced in advance, and downloads N bytes of content ( At step S15), the download is stopped at that time (step S16), and reproduction of the content is attempted (step S17). Here, the threshold value N may be a fixed value common to all contents, or may be dynamically changed according to the bit rate of the contents data. Further, this content reproduction is to confirm whether or not reproduction is possible, and the video and audio being reproduced may or may not be presented to the user.

  Here, it is assumed that the client device 2 holds information such as the content information 3 held in the client device 2 illustrated in FIG. 4 for each content. Among these pieces of information, the URL attribute, size attribute, title attribute, and gene attribute are information acquired from the server device 1, and the usable attribute (contents reproducibility information) is information added by the client device 2 by a method described later. It is. The information of each content held by the client device 2 satisfies the information necessary when the client device 2 issues a download request to the server device 1 and the information necessary when the client device 2 displays a list of contents. Anything is fine.

  As a result of the reproduction in step S17, it is determined whether or not the reproduction is possible (step S18). If reproduction is possible, a reproduction flag is set in the usable attribute of content [i] (step S19). If reproduction is impossible, a reproduction impossible flag is set in the content [i] usable (step S24).

  Thereafter, each attribute of content [i] is displayed on the screen (step S20). An example of a content list displayed on the client device 2 is shown in a content list screen 4 with playability information in FIG. The items to be presented in the list are at least information that allows the user to identify the content, for example, the content list screen 4 with reproducibility information, so that the user can identify the content such as reproducibility, genre, title, size, etc. Any information can be used. On the content list screen 4 with reproducibility information, for reproducibility, a symbol “◯” indicating that reproducibility is possible and a symbol “×” indicating that reproducibility is not possible are displayed in the content list. After the information on content [i] is displayed on the screen, the data on it is no longer necessary, so the partially downloaded data (data for N bytes) of content [i] is discarded (step S21).

  The partial content data is preferably discarded in this manner, but it is preferable to store the availability information regarding the content [i] in the storage means described above. In addition, when this storage is performed, the system of the client device 2 may be changed even if stored, so that information on availability can be added to the client device 2 by the time of determination after generation. It may be determined whether there is an application program that has been deleted (including version upgrades).

  When the client device 2 sequentially performs these processes on the M pieces of content when the content list is displayed, the client device 2 can indicate to the user a content list that can be recognized at a glance.

  The content availability display system according to the present embodiment uses the download method according to the present invention that is adopted to present the availability in the client device 2 as described above. In this content availability presentation system, when browsing a list of contents such as multimedia contents managed by the server device 1 on the client device 2, whether or not each content can be reproduced on the client device 2 in the list. This allows the user to know the content available on the client device 2 before downloading it. Therefore, the user can prevent an instruction to download useless content that cannot be reproduced.

  The example described with reference to FIGS. 3 to 5 is a method of displaying information on whether or not the content can be reproduced on the content list with respect to the content on all the server devices 1 including the content that cannot be reproduced. However, as another example, a mode in which only reproducible content is displayed in the content list on the client device 2 will be described with reference to FIGS. 6 and 7.

  FIG. 6 is a flowchart for explaining another example of processing relating to the content availability presentation system of FIG. 3. FIG. 7 is a diagram showing a display example of a content list displayed on the display device in the processing example of FIG. 6, in which 5 is a reproducible content list display screen.

  Other examples of the operation of presenting the availability of content to the client device 2 may be performed by executing steps S31 to S42 similar to steps S11 to S18 and S20 to S23 described with reference to FIG. It is assumed that no processing is executed. However, if it is determined in step S39 that the content [i] is reproducible, as shown in the information on the content [i], for example, the reproducible content list display screen 5 in FIG. 7, the genre, title, size Information that can identify the content is displayed. Then, after the information on the content [i] is displayed on the screen, the data on the content [i] is no longer necessary, so the partially downloaded data (N bytes) of the content [i] is discarded (step S40). ). On the other hand, if it is determined in step S38 that content [i] cannot be reproduced, the downloaded data is discarded without displaying (step S40). In the processing after step S40, the same processing is sequentially performed on the M pieces of content as in the example described with reference to FIG. 3, but in this example, the client device 2 displays only a list of reproducible content.

  Here, regarding each of the above-described embodiments, various information processing in a general-purpose computer such as a PC and a mobile computer such as a PDA, such as the server device 1 and the client device 2, can be generally applied to the present invention shown in FIG. This will be briefly described with reference to a configuration example of the information processing apparatus. In FIG. 8, 11 is a CPU (Central Processing Unit), 12 is a RAM (Random Access Memory), 13 is a hard disk drive (HDD), 14 is an input device, 15 is a display device, 16 is a communication device, and 17 is a bus. is there.

  Information handled in this system is temporarily accumulated in the RAM 12 during the processing, and then stored in a storage means such as the HDD 13, and is read out and corrected / written by the CPU 11 as necessary. A program for causing a computer to function as this system or each device is stored in each ROM, HDD 13 or the like, and is executed by the CPU 11 reading it. Further, the progress of the process and the result of the process are presented to the user through a display device 15 such as a CRT (Cathode-Ray Tube), LCD (Liquid Crystal Display), PDP (Plasma Display Panel), etc., and if necessary, a keyboard. The user may input parameters and responses necessary for processing from the input device 14 such as a mouse (pointing device). This program may be provided with a graphical user interface (GUI) for the display device 15 so as to be easy for the user to use. The communication device 16 is a device for connecting to the above-described network or the like to perform communication. Note that the CPU 11, RAM 12, HDD 13, input device 14, display device 15, communication device 16 and other output devices such as a printer need only be connected by a bus 17 or the like.

  As described above, each embodiment has been described centering on the system of the present invention with reference to FIGS. 1 to 8. However, the present invention has been described in the description of the client device and the server device in each of the above-described embodiments. In addition, a program for causing an information processing device (for example, a computer), either a client device or a server device, to function as the system or a determination unit thereof, or a computer to perform a processing procedure of the system or a processing procedure in the determination unit. It can be implemented as a program for execution, or as a recording medium readable by an information processing device that records the program.

  An embodiment of a recording medium storing a program and data for realizing the function of content download or content availability presentation according to the present invention will be described. Specifically, a CD-ROM, magneto-optical disk, DVD-ROM, FD, flash memory, and other various ROMs and RAMs can be assumed as the recording medium. The functions of the client device and the server device) are executed, and a program for realizing the download or availability indication function is recorded on these recording media and distributed, thereby facilitating the realization of this function. Then, the information processing apparatus such as the computer illustrated in FIG. 8 is loaded with the recording medium as described above, and the program is read by the information processing apparatus, or the program is loaded on the recording medium included in the information processing apparatus. By storing the content and reading it out as necessary, it is possible to execute the function of content download or content availability indication according to the present invention.

It is the schematic which shows the example of the network system applicable to the content download system which concerns on this invention. It is a flowchart for demonstrating the process example in the content download system which concerns on one Embodiment of this invention. It is a flowchart for demonstrating the process example in the content use availability presentation system which concerns on one Embodiment of this invention. FIG. 4 is a diagram illustrating an example of content information held in a client device in the processing example of FIG. 3. FIG. 4 is a diagram illustrating a display example of a content list displayed on the display device in the processing example of FIG. 3. It is a flowchart for demonstrating the other process example regarding the content use availability presentation system of FIG. FIG. 7 is a diagram illustrating a display example of a content list displayed on the display device in the processing example of FIG. 6. FIG. 11 is a block diagram illustrating a configuration example of a general information processing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Server apparatus, 2 ... Client apparatus, 3 ... Content information hold | maintained at client apparatus, 4 ... Content list screen with reproducibility information, 5 ... Reproducible content list display screen, 11 ... CPU, 12 ... RAM, 13 ... HDD, 14 ... input device, 15 ... display device, 16 ... communication device.

Claims (8)

  What is claimed is: 1. A content download system comprising: a server device that holds a plurality of content data; and a client device that downloads and uses content data held in the server device by connecting to the server device over a network. When downloading content data from a device to the client device, whether or not the content data can be used by the client device is determined from the partially downloaded content data after the download starts and before the download ends. A content download system comprising a determination unit.   The determination unit is a content data determination unit provided to be executable on the client device or provided to the server device so as to be executable on the client device, and the content data determination unit is the server device Determining whether or not the partial content data downloaded so far can be executed by the client device after a predetermined time has elapsed or a predetermined number of bytes have been received since the start of downloading the content data from The content download system according to claim 1, wherein:   If it is determined by the determination means that the content data that has started downloading is not usable by the client device, the interruption means for interrupting the download and the content data that has started downloading by the determination means are The content download system according to claim 1, further comprising: a continuation unit that continues the download only when it is determined that the client device can use the content.   3. A content availability display system that uses the content download system according to claim 1 and presents the availability of content in the client device, wherein the server device responds to a request from the client device. Means for displaying a list of the above content data, and means for displaying whether or not the client device can be used in the content data displayed on the list based on the determination result of the determination means A content availability presentation system characterized by the above.   A content availability determination system that uses the content download system according to claim 2 to present availability of content in the client device, wherein the content data determination means is held in the server device for download. Executed for all types of content data, and the server device displays a list of content data on the server device in response to a request from the client device, and among the content data to be displayed on the list And a means for displaying availability of the client device based on the determination result of the content data determination means.   A program for causing an information processing device to function as the content download system according to any one of claims 1 to 3.   A program for causing an information processing device to function as the content use availability presentation system according to claim 4 or 5.   A recording medium in which the program according to claim 6 is recorded and is readable by an information processing device.

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