JP2005166168A - Data reproducing apparatus, computer program for the same, and recording medium recorded with the computer program - Google Patents

Data reproducing apparatus, computer program for the same, and recording medium recorded with the computer program Download PDF

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Publication number
JP2005166168A
JP2005166168A JP2003403890A JP2003403890A JP2005166168A JP 2005166168 A JP2005166168 A JP 2005166168A JP 2003403890 A JP2003403890 A JP 2003403890A JP 2003403890 A JP2003403890 A JP 2003403890A JP 2005166168 A JP2005166168 A JP 2005166168A
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data
reproduction
recording medium
management information
information
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JP2005166168K1 (en
JP2005166168A5 (en
Inventor
Kaoru Hieda
Tatsuo Shudo
Masafumi Takahashi
Toru Ueda
徹 上田
薫 稗田
達生 首藤
雅史 高橋
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Sharp Corp
シャープ株式会社
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Publication of JP2005166168A5 publication Critical patent/JP2005166168A5/ja
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a data reproducing apparatus which permits to resume reproduction by an easy operation from a point where the reproduction is interrupted in reproducing the data from a plurality of apparatus. <P>SOLUTION: The data reproducing apparatus 300 includes: a reproducing section 354 which reproduces the data recorded in a first recording medium 310; a reproduction information updating section 350 which generates reproduction management information including reproduction interruption position information when the reproduction of the data by the reproducing section 354 is interrupted, and records the information in the first recording medium 310 by making information correspondent to the data separately from the data; and the reproducing section 354 and an encryption section 362 for copying the data recorded to the first recording medium 310 to an attachable and detachable second recording medium 314 in response to a copying instruction signal. The reproduction information updating section 350 copies the reproduction management information to the second recording medium 314 if the reproduction management information corresponding to the data to be copied to the second recording medium 314 exists in the first recording medium 310. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technique for moving and reproducing data between a plurality of devices having a reproduction function, and in particular, when the reproduction is stopped halfway and the data is moved to another device, the operation can be easily performed. The present invention relates to a data reproducing apparatus capable of reproducing the content continuously from the point where the reproduction is stopped.

  With the advancement of digital technology and the price reduction of recording devices, AV (Audio Visual) data such as video and music can be digitally recorded on a recording medium and read out with high reliability. . Various types of recording media can be used, such as large-capacity hard disks, disk media such as CD-ROM (Compact Disc Read-Only Memory) or DVD (Digital Versatile Disc), flash memory, and memory cards such as SD cards. It has become.

  Along with this, various devices for reproducing such AV data have appeared. For example, a DVD player that reproduces AV data recorded on a DVD, a hard disk recorder that has a function of recording a large amount of AV data on a hard disk, and reading it on demand.

  Some AV data, such as movies, require a relatively long time for reproduction. For this reason, when a movie is being played on a DVD player, playback may be interrupted due to some errands. In such a case, after completing the errand, the movie is often resumed from where it was interrupted. In this case, the user will want to continue playback from the playback stop point with an easy operation. In the case of a video tape recorder or the like that has been used before, the tape stops running when playback is stopped. Therefore, if the reproduction is resumed, the reproduction is naturally performed from that point. However, in the case of digital AV data, such reproduction is difficult unless some measures are taken.

  As a proposal for solving such a problem, there is a reproducing apparatus described in Patent Document 1 described later. This reproducing apparatus is for reproducing data recorded on a recording medium on which identification information is recorded. For each recording medium, this reproducing apparatus records its identification information and information indicating the location where reproduction of the data on the recording medium is interrupted (reproduction interruption location) in its own storage device. Next, when reproducing the same recording medium, based on the identification information of the recording medium, information indicating the reproduction interruption location is read from the storage device, and reproduction is resumed from that location.

  FIG. 19 shows the configuration of the recording area of a recording medium (for example, DVD, memory card, etc.) according to CPRM (Content Protection for Recordable Media) currently proposed as a method for copy protection of AV data or the like. Referring to FIG. 19, DVD 800 and memory card 810 have data recording areas 802 and 812 and read-only areas 804 and 814, respectively. Identification information of the recording medium is stored in these read-only areas 804 and 814 and the like. The recording medium is identified by reading the identification information stored in the read-only area 804 or 814. Further, information indicating the reproduction interruption point corresponding thereto is read from the data recording area 802 or 812.

  The one described in Patent Document 1 is only for recording a reproduction interruption point for each recording medium. Therefore, when there are a plurality of data items on one recording medium, it is not possible to resume the reproduction from the reproduction interruption point for all the data items.

  In the reproduction apparatus described in Patent Document 2 described later, information on the reproduction interruption point is recorded for each data item. By doing so, even if there are a plurality of data items in one recording medium, it is possible to resume reproduction from the reproduction interruption point for each data item.

Japanese Patent Laid-Open No. 3-184171 JP2003-219369 JP2002-251819

  With the recent development of digital technology and the development of display device technology such as liquid crystal, AV data recording / reproducing devices are increasingly miniaturized. For example, AV data can be reproduced by a mobile phone or a small portable information terminal. By providing such a device with a relatively large-capacity, small-sized and removable recording medium such as a memory card, it is possible to reproduce a variety of AV data.

  For example, a user who has the above-described mobile phone and DVD player may need to go out for some reason while playing AV data on the DVD player. In such a case, it is convenient if the same AV data can be continuously reproduced by the mobile phone. For this purpose, the DVD player may be provided with a rewritable recording medium writing / reading device used in a mobile phone. By writing AV data from a DVD player to a recording medium, and mounting and reproducing the AV data on a mobile phone, the same AV data can be enjoyed on the mobile phone. Such usage is not limited to a combination of a DVD player and a mobile phone. For example, a mobile device such as a PDA (Personal Digital Assistant) or a handy PC (Personal Computer) may be used instead of the mobile phone. Instead of a DVD player, a device such as a general PC, digital TV, or hard disk player may be used.

  Assuming such a method of use, a playback device including a plurality of storage device drives in a single device is becoming widespread. For example, some hard disk players and the like include a hard disk in themselves, and further include a DVD recording / reproducing device and a flash memory writing / reading device.

  FIG. 20 shows an outline of such a system 840. Referring to FIG. 20, this system 840 includes a hard disk player 850 having a hard disk 860 and a mobile phone 852. It is assumed that some AV data is recorded on the hard disk 860. Hard disk player 850 further includes a writing / reading device (not shown) for memory card 862. Similarly, the cellular phone 852 includes a writing / reproducing device for the memory card 862.

  By writing AV data recorded on the hard disk 860 to the memory card 862 and attaching the memory card 862 to the mobile phone 852, the mobile phone 852 can also reproduce the original AV data. Thus, when copying (or moving) AV data between a plurality of types of recording media, not only a combination of a hard disk and a memory card, but also a number of combinations such as a DVD and a hard disk, a memory card and a memory card, and the like. Conceivable.

  As described above, even when the AV data reproducing apparatus is moved to a different type of AV data and is continuously reproduced, it is convenient if the reproduction can be continued from the reproduction stop point by an easy operation. However, both the device described in Patent Document 1 and the device described in Patent Document 2 can only be reproduced from the reproduction interruption point only when the same recording medium is reproduced by the same reproducing device, and different devices. However, this does not allow such an operation.

  Therefore, there is a need for a technology that enables resumption from such an interrupted location even between different types of playback devices.

  By the way, when the same AV data is to be reproduced by a plurality of devices as described above, there may be a problem regarding copyright. Therefore, a mechanism for protecting copyright is incorporated in a general reproduction apparatus. For example, in a copyright protection mechanism called copy-once, control information is included in data so that data can be copied only once. However, data movement is possible. Some data movements have strict procedures to prevent illegal copying of data. For example, when moving data from one medium to another, the original data is deleted in the middle of data replication to the destination, and then the destination data is copied for the first time. There is something that is. The same applies when returning data to the original medium.

  However, when data is moved between different types of playback devices as described above, there is a possibility that a problem that has not been considered so far may occur. Generally speaking, although the recording capacity of a small recording medium used in a mobile phone or the like is relatively large, its size is naturally limited. For this reason, a large amount of data such as AV data does not fit into a small recording medium in the same recording format as recording on a DVD. Therefore, when data is moved to a small recording medium, the data format is converted in order to reduce the amount of data. For example, by converting data in MPEG2 (Moving Picture Experts Group 2) format into MPEG4 format, the amount of data can be greatly reduced and stored in a small recording medium such as a memory card.

  However, the image quality / sound quality of AV data deteriorates as the amount of data decreases. For this reason, the following problems arise when trying to follow the copyright protection mechanism.

  FIG. 21 is a schematic diagram for explaining this problem. Referring to FIG. 21, a case is considered where AV data 890 recorded on recording medium 880 having a large recording capacity is moved to recording medium 900 having a small recording capacity. Identification information 892 and 902 are recorded in the read-only areas of the recording medium 880 and the recording medium 900, respectively. In the CPRM described above, the AV data 890 recorded on the recording medium 880 is encrypted using the identification information 892. When moving the AV data 890 to the area 904 of the recording medium 900, the AV data 890 is decrypted using the identification information 892, and then encrypted using the identification information 902 of the recording medium 900. Then, the encrypted AV data 910 is recorded on the recording medium 900.

  On the other hand, in the recording medium 880, the AV data 890 is deleted simultaneously with the movement of this data. As a result, the area 912 in which the AV data 890 of the recording medium 880 is stored becomes a free area. As a result, the AV data has moved from the recording medium 880 to the AV data 890.

  Along with such movement of data, the recording capacity of the recording medium 900 is smaller than the recording capacity of the recording medium 880, so the data format is converted so that the data capacity becomes smaller. For example, the format conversion is a conversion from the MPEG2 format of the AV data 890 to the MPEG4 of the AV data 910. At this time, the following problem of image quality degradation occurs.

  FIG. 22 shows a schematic diagram for explaining this problem. Referring to FIG. 22, consider a case where AV data 922 in a recording medium 920 having a large recording capacity is moved to a recording medium 930 having a small recording capacity. Due to the format conversion, the image quality deteriorates due to this movement. For example, data that was clearly reproducible in the AV data 922 as indicated by the enlargement unit 924 deteriorates in the AV data 932 of the recording medium 930 as indicated by the enlargement unit 934 and is not a clear image.

  Consider a case where the AV data 932 is returned to the original recording medium 920 again. In this case, even if the recording format is converted and the MPEG2 AV data 942 is returned to the recording medium 920, the image quality is once deteriorated, so that the image is as clear as the original as shown by the enlargement unit 944. It will not be. Therefore, in this case, it is meaningless to perform format conversion. For this reason, format conversion is not performed during this movement, and the data is stored in the recording medium 920 in MPEG4.

  If the AV data is moved while performing format conversion in this way, only AV data of the format with the lowest image quality remains after all. Thus, even if the AV data can be moved, it is meaningless if the initial image quality cannot be saved.

  Such a problem occurs not only with the format conversion but also when the display size of the AV data is converted to a small size or when the conversion is performed to reduce the color depth (number of colors) of the display color.

  Therefore, an object of the present invention is to provide a data reproducing apparatus capable of resuming reproduction by a simple operation from a reproduction interruption point when data reproduction is interrupted and then the data is moved to another recording medium and reproduced by another reproducing apparatus. And providing a computer program therefor and a recording medium storing the computer program.

  Another object of the present invention is that, when data reproduction is interrupted, when the data is moved to another recording medium and reproduced by another reproducing apparatus, the reproduction can be resumed by an easy operation from the reproduction interruption point, and the format To provide a data reproducing apparatus that does not cause signal degradation even when conversion is performed, a computer program therefor, and a recording medium on which the computer program is recorded.

  According to a first aspect of the present invention, there is provided a data reproducing apparatus, a reproducing unit for reproducing data recorded on a first recording medium, and data in response to interruption of reproduction of data by the reproducing unit. Reproduction management information including reproduction interruption position information expressing a position where reproduction of the reproduction is interrupted is generated, and is recorded on the first recording medium separately from the data and in association with the data In response to the information generation means and the first copy instruction signal for instructing copying of data from the first recording medium, the data recorded on the first recording medium is transferred to the removable second recording medium. A first data copying means for copying, and whether or not reproduction management information corresponding to data copied to the second recording medium by the first data copying means is in the first recording medium; , If applicable, playback management And a reproduction management information copying means for copying the broadcast on the second recording medium.

  The reproduction management information is generated in association with the original data and as a separate file from the original data, and is recorded on the first recording medium. When the original data is copied to the second recording medium, if there is reproduction management information corresponding to this data, it is also copied. When this data is reproduced using the second recording medium, the reproduction interruption position can be known by referring to the contents of the reproduction management information, and reproduction can be resumed from there. In addition, in a playback apparatus that does not have a function of referring to playback management information, this playback management information is ignored, so there is no possibility of adversely affecting the playback of the original data.

  Preferably, the reproduction interruption position information represents a position where reproduction of the data is interrupted using a time difference from a predetermined reference position in the data, and more preferably, the reference position is a reproduction position at the beginning of the data. .

  Since it is expressed using the time difference from the reference position of the data, usually the top playback position of the data, even if the data format is converted, the restart position is set when playback is restarted based on the playback stop position. Can be easily determined.

  More preferably, the data is specified by a combination of a file name and attribute information in the first recording medium, and the first reproduction management information generating means responds to the interruption of data reproduction by the reproducing means. The reproduction management information is generated as a file separate from the data having a file name obtained by a predetermined conversion from the file name of the data and having a predetermined attribute different from the data. Means for recording.

  By searching for a file having a file name obtained by a predetermined conversion from the file name of the original data as the reproduction management information and having a predetermined attribute, the reproduction management information for certain data can be searched. The search for the reproduction management information can be easily performed, and the risk of using the wrong reproduction management information is reduced.

  In response to a first reproduction instruction signal for instructing reproduction of data in the first recording medium, the reproduction means searches for reproduction management information associated with the data in the first recording medium. In response to the fact that the reproduction management information associated with the data designated by the first reproduction instruction signal is not retrieved by the reproduction management information retrieval means and the reproduction management information retrieval means, the data is reproduced from the beginning. Data is reproduced from the reproduction interruption position information in the reproduction management information in response to retrieval of reproduction management information associated with the data designated by the first reproduction instruction signal by the reproduction management information retrieval means. Means for doing so.

  If the reproduction management information is found, the reproduction is resumed from the reproduction interruption position according to the content, and if there is no reproduction management information, the reproduction is resumed from the beginning of the data. Regardless of the presence or absence of reproduction management information, the original data can be reproduced in an appropriate manner.

  Preferably, the reproduction management information retrieval unit obtains the file name identification unit for identifying the file name of the data and a predetermined conversion from the file name of the designated data in response to the first reproduction instruction signal. And means for searching the first recording medium for reproduction management information separate from data having a predetermined file name and having a predetermined attribute.

  By searching for a file having a file name obtained by a predetermined conversion from the original data as the reproduction management information and having a predetermined attribute, the reproduction management information for certain data can be retrieved. The search for the reproduction management information can be easily performed, and the risk of using the wrong reproduction management information is reduced.

  More preferably, the first reproduction management information generation unit generates the reproduction management information in response to the reproduction of the data by the reproduction unit being interrupted, and the reproduction management information is reproduced in the reproduction management information. A function specifying information indicating that it has a function as management information may be included, and a means for recording on the first recording medium separately from the data and in association with the data may be included. The data reproducing apparatus further includes means for determining whether or not the function management information is included in the reproduction management information searched by the means for searching, and means for searching by the means for determining In response to the determination that the reproduction management information retrieved by means includes function specifying information, the reproduction management retrieved by the retrieval means is activated by activating reproduction from the reproduction interruption position by the reproduction means. In response to the determination that the information does not include function specifying information, a means for activating reproduction from the head of the data by the means for reproducing may be included.

  Even when the reproduction management information is retrieved, the reproduction resumption control is performed according to the contents only when the function specifying information indicating that the reproduction management information is included in the reproduction management information. Even if a file other than playback management information is mistakenly searched as playback management information as a result of a search using only the file name and attributes, it does not include function-specific information. It is not.

  More preferably, the first reproduction management information generating unit generates the reproduction management information in response to the reproduction of the data by the reproducing unit being interrupted, and the reproduction management information is reproduced in the reproduction management information. The first recording medium includes function specifying information indicating that it has a function as management information and data specifying information for specifying data together with its attributes, separately from the data and in association with the data Means for recording. The data reproduction apparatus further includes a determination unit for determining whether or not the function management information is included in the reproduction management information retrieved by the retrieval unit, and the reproduction management retrieved by the retrieval unit. By means for searching by the match detecting means for detecting a match between the data specified by the data specifying information included in the information and the data instructed to be played back by the first playback instruction signal, and by means for searching by the judging means In response to the fact that the retrieved reproduction management information is determined to include function specifying information and a match is detected by the match detection means, the playback from the playback interruption point by the means for playing is activated and searched. In response to determining that the reproduction management information retrieved by the means for reconstructing does not include the function specifying information, the reproduction management information is reproduced from the beginning of the data by the means for reproducing. The and means for activating.

  Even when the reproduction management information is retrieved, the function identification information indicating that it is the reproduction management information is included therein, and the data identified by the data identification information included therein Only when the coincidence with the data instructed to be reproduced is detected, the reproduction resumption control is performed according to the content. Even if a file other than playback management information is mistakenly searched as playback management information as a result of a search using only the file name and attributes, it does not include function-specific information. It is not. Also, if the reproduction management information happens to correspond to other data, there is no possibility that the reproduction will be erroneously executed.

  The data reproducing device further searches the first recording medium for reproduction management information corresponding to the data in response to the reproduction means completing reproduction until the end of the data in the first recording medium, If there is, a means for deleting the reproduction management information may be included.

  If reproduction is executed to the end of the data, the next data may be reproduced from the beginning of the data. The reproduction management information is unnecessary, and the capacity of the recording medium can be saved by deleting it.

  The data reproducing apparatus further receives the data recorded on the second recording medium in response to a second copy instruction signal instructing copying of data from the second recording medium to the first recording medium. The second data copy means for copying to the other recording medium, and whether or not the reproduction management information corresponding to the data copied to the first recording medium by the second data copying means is in the second recording medium If there is, the reproduction management information corresponding to the data copied to the first recording medium by the second data copying means is generated in the first recording medium based on the reproduction management information. And second reproduction management information generating means for recording.

  When copying the data in the second recording medium to the first recording medium, if the corresponding reproduction management information is also created in the first recording medium, the data can be recorded halfway using the second recording medium. If reproduction has been performed, reproduction can be continued from the reproduction interruption position at the next reproduction of the data copied to the first recording medium. Even when data is reproduced while being copied between various reproduction devices, the reproduction can be continuously executed with an easy operation.

  Preferably, each of the first recording medium and the second recording medium has a read-only area in which unique identification information for specifying the recording medium is recorded. In addition, the data reproducing apparatus further responds to the instruction to record the data on the first recording medium, and the identification information of the first recording medium in which the data is recorded in the reading area of the first recording medium. And a first encryption means for encrypting and recording on the first recording medium. The reproduction means responds to the data reproduction instruction signal for instructing reproduction of data, and records the data recorded by the first encryption means in the first recording medium in the read-only area in the first recording medium. First decryption means for decrypting using the key created based on the recorded identification information is included.

  By encrypting the data recorded on the first recording medium with the identification information of the first recording medium, the data reproducing apparatus having no decoding function cannot reproduce the data on the recording medium. It becomes possible to place restrictions on data reproduction. In addition, when the recording medium is attached to the apparatus main body and cannot be removed, the identification information stored in the read-only memory of the apparatus main body can be used instead of the identification information of the recording medium.

  Preferably, the first data copy means is means for decoding the data designated by the first copy instruction signal using the first decoding means in response to the first copy instruction signal. When the data decrypted by the first decryption means is copied to the second recording medium, conversion necessity judgment means for judging whether or not the format conversion of the data is necessary, and whether the conversion is necessary In response to determining that format conversion is unnecessary by the determination means, the data decoded by the first decoding means is created based on the identification information recorded in the read-only area of the second recording medium. A second encryption means for encrypting using the key and writing to the second recording medium; and at the same time the data is encrypted and written by the second encryption means, the data is sent to the first recording medium Means for deleting from In response to determining that the format conversion is necessary by the necessity determination unit, a format conversion unit for converting the data decoded by the first decoding unit into a predetermined format, and a format by the format conversion unit The third encryption means for encrypting the converted data using a key created on the basis of the identification information recorded in the read-only area of the second recording medium and writing to the second recording medium And at the same time the data whose format has been converted by the third encryption means is written to the second recording medium, the data recorded on the first recording medium is read from the second recording medium. And third encryption means for encrypting using a key created based on the identification information recorded in the dedicated area and replacing the data in the first recording medium.

  When it is necessary to move the data that has been encrypted and recorded on the first recording medium to the second recording medium, the key is generated based on the identification symbol of the second recording medium after decrypting the data. Is encrypted and recorded on the second recording medium. At the time of reproduction from the second recording medium, it can be decrypted with a key created based on the identification information of the second recording medium. On the other hand, if this data is copied to another recording medium, a key for decryption cannot be obtained, so that it cannot be reproduced and data reproduction can be restricted. Further, the data recorded on the first recording medium and encrypted with the key created based on the identification information of the first recording medium is created based on the identification information of the second recording medium. Double-encrypted with the specified key. The device of the first recording medium cannot be played back. As a result, the number of reproducible copies of data can be maintained at one.

  Preferably, the second data copy means includes data existence determination means for determining whether data corresponding to the data designated by the second copy instruction signal exists in the first recording medium; In response to determining that the corresponding data is not present on the first recording medium by the data presence / absence determining means, the data recorded on the second recording medium is read-only from the second recording medium. A second decryption unit for decrypting using the key created based on the identification information recorded in the area, giving the first encryption unit for writing to the first recording medium, and a data existence unit In response to determining that the corresponding data is present on the first recording medium, the corresponding data recorded on the first recording medium is read from the read-only area of the second recording medium. Created based on the identification information recorded in The first decryption means using the second decryption means or the third decryption means for decrypting with the corresponding key and replacing it with the corresponding data and writing to the first recording medium. Means for deleting data in the second recording medium simultaneously with writing of the data to the recording medium.

  When copying the data in the second recording medium to the first recording medium, if there is no data corresponding to this data in the first recording medium, the data is simply copied and the data in the second recording medium is copied. delete. Thereby, the number of reproducible copies of data can be maintained at one. Further, when there is corresponding data in the first recording medium, the data before format conversion is reproduced from the first recording medium by decoding the data with the identification information of the second recording medium. Is possible. In this case, the image quality does not deteriorate. Furthermore, since the data in the second recording medium is deleted, the number of reproducible copies of the data can be maintained at one.

  According to a second aspect of the present invention, there is provided a data reproducing apparatus for reproducing data recorded on a recording medium, and for reproducing data in response to interruption of reproduction of data by the reproducing means. Reproduction management information generating means for generating reproduction management information including reproduction interruption position information expressing the interrupted position and recording it on a recording medium separately from the data and in association with the data is included.

  The reproduction management information is generated in association with the original data and as a separate file from the original data, and is recorded on the first recording medium. When the original data is copied to the second recording medium, if there is reproduction management information corresponding to this data, it is also copied. When this data is reproduced using the second recording medium, the reproduction interruption position can be known by referring to the contents of the reproduction management information, and reproduction can be resumed from there. In addition, in a playback apparatus that does not have a function of referring to playback management information, this playback management information is ignored, so there is no possibility of adversely affecting the playback of the original data.

  Preferably, the reproduction interruption position information represents the position where the reproduction of the data is interrupted using a time difference from a predetermined reference position in the data, and more preferably, the predetermined reference position is the reproduction of the beginning of the data. Position.

  Since it is expressed using the time difference from the reference position of the data, usually the top playback position of the data, even if the data format is converted, the restart position is set when playback is restarted based on the playback stop position. Can be easily determined.

  More preferably, the data is specified by a combination of a file name and attribute information in the recording medium, and the reproduction management information generating means responds to the interruption of the reproduction of the data by the reproducing means, and the previous reproduction management information To record the reproduction management information on the first recording medium as a file having a file name obtained by a predetermined conversion from the file name of the data and having a predetermined attribute different from that of the data and separate from the data Including means.

  By searching for a file having a file name obtained by a predetermined conversion from the file name of the original data as the reproduction management information and having a predetermined attribute, the reproduction management information for certain data can be searched. The search for the reproduction management information can be easily performed, and the risk of using the wrong reproduction management information is reduced.

  A reproduction unit configured to retrieve reproduction management information associated with the data in the recording medium in response to a first reproduction instruction signal instructing reproduction of data in the recording medium; In response to the fact that the reproduction management information associated with the data designated by the first reproduction instruction signal is not retrieved by the reproduction management information retrieval means, the data is reproduced from the beginning, and the reproduction management information retrieval means Means for reproducing the data from the reproduction interruption position information in the reproduction management information in response to the retrieval of the reproduction management information associated with the data designated by the first reproduction instruction signal. May be included.

  If the reproduction management information is found, the reproduction is resumed from the reproduction interruption position according to the content, and if there is no reproduction management information, the reproduction is resumed from the beginning of the data. Regardless of the presence or absence of reproduction management information, the original data can be reproduced in an appropriate manner.

  Preferably, the reproduction management information search means responds to the first reproduction instruction signal with a file name specifying means for specifying the file name of the data, and a file name obtained by a predetermined conversion from the data file name. And means for retrieving reproduction management information in the recording medium, which is different from the data and has predetermined attributes.

  By searching for a file having a file name obtained by a predetermined conversion from the file name of the original data as the reproduction management information and having a predetermined attribute, the reproduction management information for certain data can be searched. The search for the reproduction management information can be easily performed, and the risk of using the wrong reproduction management information is reduced.

  More preferably, the reproduction management information generating unit generates the reproduction management information in response to the interruption of the data reproduction by the reproducing unit, and the reproduction management information is included in the reproduction management information as the reproduction management information. And means for recording on the recording medium separately from the data and in association with the data. The data reproducing apparatus further includes means for determining whether or not the function management information is included in the reproduction management information searched by the means for searching, and means for searching by the means for determining In response to the determination that the reproduction management information retrieved by means includes function specifying information, the reproduction management retrieved by the retrieval means is activated by activating reproduction from the reproduction interruption position by the reproduction means. Means for activating reproduction from the beginning of the data by means for reproducing in response to determining that the information does not include function specifying information.

  Even when the reproduction management information is retrieved, the reproduction resumption control is performed according to the contents only when the function specifying information indicating that the reproduction management information is included in the reproduction management information. Even if a file other than playback management information is mistakenly searched as playback management information as a result of a search using only the file name and attributes, it does not include function-specific information. It is not.

  The reproduction management information generating unit generates the reproduction management information in response to the interruption of the data reproduction by the reproducing unit, and the reproduction management information has a function as the reproduction management information. Means for recording on the first recording medium separately from the data and in association with the data, including the function specifying information indicating the data and the data specifying information specifying the data together with the attribute May be included. The data reproduction apparatus further includes a determination unit for determining whether or not the function management information is included in the reproduction management information retrieved by the retrieval unit, and the reproduction management retrieved by the retrieval unit. The data specified by the data specifying information included in the information is matched by means for detecting the match with the data instructed to be reproduced by the first reproduction instruction signal, and by means for searching by the determining means. In response to the fact that the retrieved reproduction management information is determined to include function specifying information and a match is detected by the match detection means, the playback from the playback interruption point by the means for playing is activated and searched. In response to determining that the reproduction management information retrieved by the means for reconstructing does not include the function specifying information, reproduction from the head of the data by the means for reproduction is performed. The and means for activating.

  Even when the reproduction management information is retrieved, the function identification information indicating that it is the reproduction management information is included therein, and the data identified by the data identification information included therein Only when the coincidence with the data instructed to be reproduced is detected, the reproduction resumption control is performed according to the content. Even if a file other than playback management information is mistakenly searched as playback management information as a result of a search using only the file name and attributes, it does not include function-specific information. It is not. Also, if the reproduction management information happens to correspond to other data, there is no possibility that the reproduction will be erroneously executed.

  Preferably, the data reproducing apparatus further searches the recording medium for reproduction management information corresponding to the data in response to the completion of reproduction by the reproducing means until the end of the data in the recording medium. And means for deleting the reproduction management information.

  If reproduction is executed to the end of the data, the next data may be reproduced from the beginning of the data. The reproduction management information is unnecessary, and the capacity of the recording medium can be saved by deleting it.

  More preferably, the recording medium has a read-only area in which unique identification information for specifying the recording medium is recorded, and the reproducing means is in the recording medium in response to a data reproduction instruction signal for instructing data reproduction. Decryption means for decrypting the recorded data using a key created based on the identification information recorded in the read-only area in the recording medium.

  By encrypting the data recorded on the recording medium with the identification information of the recording medium, the data cannot be reproduced if the data is separated from the recording medium. That is, it is possible to restrict data copying.

  When the computer program according to the third aspect of the present invention is executed by a computer, the computer program realizes all the functions of any of the above-described data reproducing devices.

  A computer-readable recording medium according to the fourth aspect of the present invention records the above-described computer program.

  According to the present invention, when data recorded on the first recording medium is played back by the data playback device and interrupted, playback management information is created separately from the data. When this data is copied to the second recording medium, the corresponding reproduction management information is also copied. When this data is reproduced using the second recording medium, the reproduction can be resumed from the reproduction interruption position with reference to the content of the reproduction management information. Further, when data reproduction is executed by another device using the second recording medium and the reproduction management information is updated, when the data is returned from the second recording medium to the first recording medium, Based on the information on the reproduction interruption position based on the reproduction management information of the second recording medium, reproduction management information is generated in the first recording medium. Using the reproduction management information, the data on the first recording medium can be resumed from the reproduction interruption position. Therefore, it is possible to continuously reproduce one data with various operations on various devices. In addition, there is no possibility of adversely affecting the reproduction of the original data.

  Furthermore, verification by function specifying information or file name is performed so that erroneous reproduction management information is not used. Therefore, there is very little risk of malfunction caused by using the reproduction management information.

  Further, by encrypting the data recorded on the first recording medium with the identification information of the first recording medium, the data reproducing apparatus having no decoding function cannot reproduce the data on the recording medium. It becomes possible to place restrictions on data reproduction.

  When it is necessary to move the data that has been encrypted and recorded on the first recording medium to the second recording medium, the data is encrypted with the identification information of the first recording medium that has been recorded on the first recording medium. The recorded data is doubly encrypted with the identification information of the second recording medium. The device of the first recording medium cannot be played back. As a result, the number of reproducible copies of data can be maintained at one. Further, if there is a second recording medium, the data encrypted on the first recording medium can be decrypted using a key created based on the identification information of the second recording medium. This data does not cause a problem such as data deterioration. As a result, it is possible to continuously reproduce data by a simple operation using a plurality of data reproducing apparatuses while maintaining the number of reproducible copies as one, without the problem that only degraded data remains.

-Basic concept of the device of this embodiment-
FIG. 1 shows a block diagram of a system 30 according to an embodiment of the present invention. Referring to FIG. 1, this system 30 includes a large-capacity hard disk (first recording medium) and can be mounted with a memory card 44 (second recording medium) which is a small-capacity recording medium. A digital television receiver (hereinafter referred to as “digital television”) 40 capable of writing and reading data to and from the memory 44 and a memory card 44 can be mounted, and AV data recorded on the memory card 44 can be reproduced. Mobile phone 42 having a function. The digital television 40 normally reproduces AV data recorded on its hard disk. Only when the AV data needs to be reproduced by the cellular phone 42, the AV data is moved to the memory card 44. When playback on the mobile phone 42 is no longer necessary, AV data is returned from the memory card 44 to the hard disk in the digital television 40 again. At that time, even if format conversion is performed, image quality does not deteriorate. This method will be described later. As the memory card 44, for example, an SD card is used.

  With reference to FIG. 2, an example of the reproduction order of AV data in the system 30 will be described. As shown in FIG. 2A, in the digital television 40, playback is interrupted when a portion 66 of the AV data 60 stored in the hard disk is played. Then, as shown in FIG. 2B, the AV data 60 is converted into AV data 64 and moved to the memory card 44.

  When the memory card 44 is attached to the mobile phone 42 and a normal playback start operation is performed, the mobile phone 42 according to the present embodiment causes the end (playback) of the portion 66 corresponding to the portion 62 that has been played back by the digital television 40. Playback starts from (interruption position).

  Further, it is assumed that the reproduction is continued, and the portion indicated by the hatched portion 68 in FIG. 2C is reproduced, and the reproduction of the AV data 64 on the mobile phone 42 is stopped there. Thereafter, the memory card 44 is attached to the digital television 40, and the format of the AV data 64 is converted again into the AV data 60. Then, the reproduction of the AV data 60 is started again on the digital television 40. At this time, reproduction starts from the end of the reproduction completion portion indicated by the hatched portion 70 (the reproduction interruption position on the mobile phone 42).

  When the reproduction of the AV data 60 is completed as indicated by the hatched portion 72, the next reproduction is performed from the beginning of the AV data 60.

  Hereinafter, the configuration and operation of a system for realizing such data movement and resumption of reproduction from the reproduction interruption point will be described.

-file organization-
FIG. 3 schematically shows a file structure in the hard disk 90 included in the digital television 40. The configuration in the memory card 44 is basically the same. Referring to FIG. 3, it is assumed that AV data 100, 102, and 104 are included in recording medium 90. In the apparatus according to the present embodiment, even when AV data is moved between different playback apparatuses as described above, in order to record information for specifying the playback interruption location, the playback management information corresponding to the AV data is used. Management files 110 and 112 are recorded in the same recording medium 90 on which AV data is recorded.

  In the example shown in FIG. 3, the management file 110 is a management file for the AV data 100, and the management file 112 is a management file for the AV data 102. In the present embodiment, the management file is specified by a name that is a combination of the file name of the corresponding AV data and the extension “smi”. The extension “smi” indicates that this management file has an attribute of reproduction management information described in the SMIL language, as will be described later. In general, the extension represents the attribute of the file. In the following, for simplicity, a file name that does not include an extension and the extension are collectively referred to as a “file name”. For example, if the file name of the AV data 100 is “102030.mpeg” as shown in FIG. 3, the file name of the management file 110 is “102030.smi”. The management file is not limited to the SMIL language and can be described using any language. Further, the management file is not necessarily a text file.

  In the present embodiment, the file name excluding the extension of the management file is the same as the part excluding the extension of the file name of the AV data. In general, it is convenient to determine the name of the management file in this way. However, the present invention is not limited to only such embodiments. As long as the file name of the management file can be determined by some conversion from the file name of the AV data, the file name of the management file may be determined in any form.

  In the example shown in FIG. 3, no corresponding management file exists in the AV data 104. In this case, the reproduction of the AV data 104 is performed from the beginning.

  FIG. 4 shows the contents of the management file 110 as an example. With reference to FIG. 4, the management file 110 in the present embodiment is a text file and is described in a language called SMIL (Synchronized Multimedia Integration Language). The SMIL language is a language formulated by the W3C in order to control playback of moving images and the like.

  Referring to FIG. 4, management file 110 has tags <smil> and </ smil>. These indicate the beginning and end of the language described in SMIL, respectively.

  Within the area between the two tags, there are a header area surrounded by tags <head> and </ head> and a body area surrounded by tags <body> and </ body>. In the description of the header area, the portion “SH_RESUME_PLAY”, which is enclosed in quotation marks after “meta name =”, indicates the position where this file is AV data, where playback was interrupted during the previous playback, and the beginning of the file. This is a keyword indicating that it is reproduction management information including a reproduction interruption position (reproduction start position) represented by a time difference as a reference position, and is function identification information that identifies the function of this file. By detecting this keyword, it can be seen that the management file 110 has a function of indicating a reproduction interruption position of AV data.

  When interpreting a SMIL language document, if the interpreting device encounters a keyword that is not known in the document, the entire information including the keyword is ignored and nothing is executed. Therefore, if this management file is to be executed by some device (device capable of SMIL interpretation), nothing is done. In other words, when this keyword is included in the management file, playback from the playback interruption location is activated, but when it is not included, playback from the playback interruption location is not performed.

  A portion surrounded by quotation marks after “content =” in the header portion is a version number of what is assumed as a program for executing processing specified by the contents of this file. The program that interprets this file determines whether or not the process described in this management file can be executed by comparing this version number with its own version number. For example, the contents described in the management file having a version number older than its own version number can be basically understood and executed. In addition, management files with a version number newer than the self version number are basically ignored. In addition, it is conceivable to determine whether or not it can be executed depending on the combination of the language being used and its version number.

  The tag <video> in the body part is for specifying the AV data whose reproduction interruption position (reproduction start position) is managed by this management file and the reproduction interruption position. Specifically, the file name described in quotation marks after “src =” is the file name of the AV data, and the contents described in quotation marks after “begin =” The reproduction interruption position (reproduction start position) of the AV data is indicated by the relative time from the beginning of the AV data. If this file name matches the file name of the data for which playback is instructed, including the extension, playback from the location where playback was interrupted is activated. If they do not match, playback from the beginning of the data is activated. Is done.

  In the example shown in FIG. 3, the name of the AV data managed by the management file 110 is “102030.mpeg2”, and it is understood that the reproduction should be started from the position 100 seconds after the beginning when the reproduction is performed next. . According to the specification of the SMIL language, the description method of the actual start position is different from that shown in FIG. 4, but here, the description method described above is adopted for easy understanding.

-Outline of data manipulation-
FIG. 5 is a diagram schematically showing how the AV data recorded on the hard disk is operated in the digital television 40 according to the present embodiment. With reference to FIG. 5, how the AV data recorded on the digital television 40 is operated in accordance with the movement of the data, etc., and what mechanism is necessary for this will be described.

  There are mainly three operations for the operation of AV data in the digital television 40 except for reproduction. The first is copying from a purchased recording medium (for example, DVD) to a hard disk (hereinafter referred to as “first medium”) of the digital television 40 (in copy once, copying is allowed only once). The second is movement of AV data from the first medium to a second medium (such as a memory card) having a small recording capacity. The third is movement when data moved to the second medium is returned to the first medium again. Hereinafter, the mechanisms necessary for this will be described in order.

  Referring to FIG. 5, data operation mechanism 130 of the first medium encrypts data 132 to be copied from DVD or the like to first medium 154 using medium identification information 140 of the first medium. It includes an encoder 142 that generates first media data 154.

  The data manipulation mechanism 130 further decrypts the first medium data 154 encrypted by the medium identification information 140 of the first medium with the medium identification information 140 of the first medium when moving the first medium data 154 to the second medium. And the first medium data 154 encrypted with the medium identification information 140 of the first medium, the medium identification information 144 of the second medium, and the data transferred to the second medium And an encoder 148 for encrypting based on the hash generated from 142. The AV data encrypted by the encoder 148 is recorded again on the first medium. At this time, the original AV data is replaced with the encrypted data.

  The AV data decoded by the decoder 156 is encrypted using a key created based on the medium identification information of the second medium before being stored in the second medium. However, the mechanism for this is not shown in FIG. 5 because it is not part of the data manipulation mechanism 130 for the first medium.

  The data manipulation mechanism 130 is further added to the first medium 154 as a functional module prepared for returning the AV data (second medium data 146) recorded on the second medium to the first medium. The first medium data 154 recorded (encrypted by the medium identification information 140 of the first medium and further encrypted by the medium identification information 144 and the second medium data 146 of the second medium) is recorded. A decoder 158 for restoring AV data encrypted only with the medium identification information 140 of the first medium by decoding using the medium identification information 144 and the second medium data 146 of the second medium. Including.

  The above is summarized as follows.

  (1) When copying data from a DVD or the like to the first medium 154, the output of the encoder 142 is stored in the first medium 154.

  (2) When moving AV data stored in the first medium 154 to the second medium, the output 134 of the decoder 156 is given to the second medium, and the output of the encoder 148 is again sent to the first medium 154. To store.

  (3) When the AV data recorded on the second medium is returned to the first medium 154, the output 160 of the decoder 158 is stored in the first medium 154.

  Therefore, the data manipulation mechanism 130 selects an appropriate one of the outputs of the encoder 142, the encoder 148, and the decoder 158 in response to the control signal 150 that designates the three operation modes described above to the first medium 154. It further includes a selector 152 for providing.

  The operation of moving data from the first medium to the second medium using the data operation mechanism 130 shown in FIG. 5 (corresponding to the operation (2) above) will be described more specifically below.

  Referring to FIG. 6, consider a case where AV data 182 encrypted with identification information 184 of the first medium is recorded on first medium 180, and this is moved to second medium 190. In this case, the AV data 182 is once decoded with the identification information 184 of the first medium. Further, this AV data is encrypted by the identification information 194 of the second medium and stored as AV data 202 in the area 192 of the second medium 190.

  Simultaneously with the movement of the data, the AV data 182 of the first medium 180 is encrypted with the identification information 194 of the second medium and the hash value obtained from the encrypted AV data 202 as described above, The AV data 200 is double-encrypted and stored again in the first medium 180.

  The encryption for generating the AV data 200 from the AV data 182 of the first medium 180 requires (1) information specific to the medium and (2) information specific to the AV data 202 on the second medium 190 as a key. And The medium-specific information (1) is medium identification information to which different information is assigned to each medium. The information unique to the AV data 202 in (2) is generally a hash value obtained by performing an operation on the entire content data as described above, but is information that can identify the content. If there is, it may not be a hash value. For example, it may be a hash value of a specific portion of content data or a value obtained from a combination of a plurality of areas separated from each other in the content data. Furthermore, information such as the amount of content data or the file name may be added.

If a 128-bit hash function is used in the calculation of the hash value, there are 3.4 × 10 38 combinations, and practically sufficient protection is possible. In order to perform data protection more strictly, in addition to the method of using a hash value as a key, in the above example, a part or all of the AV data 202 may be stored in the first medium 180 and collated. It is done. By doing so, the system for determining the identity of data can be made higher.

  It is not necessary to perform encryption on the entire AV data. For example, only a specific part such as one place per 1 megabyte of data may be encrypted once every 5 seconds. By doing this, it is possible to shorten the decoding time required for the reproduction of the century while making it impossible to reproduce the video in a satisfactory manner if it is not the reproduction of the century. In the case of data compressed in the time direction such as MPEG2, more efficient encryption can be achieved by selectively encrypting all or part of the data (I frame) that has been subjected to intra-frame coding only. Is possible.

  As a result of this moving operation, the AV data 202 of the second medium can be decoded if only the identification information 194 of the second medium exists. Therefore, if the second medium 190 is attached to another playback device (for example, the mobile phone 42 shown in FIG. 1), the AV data 202 can be decoded and played back.

  On the other hand, the double-encrypted AV data 200 of the first medium 180 cannot be decrypted without the identification information 194 and the AV data 202 of the second medium, that is, without the second medium 190. . Further, as will be described later, there are two reproducible AV data at a time in the data transfer from the first medium 180 to the second medium 190 and the generation of the double-encrypted AV data 200. Control is not performed. As a result, data “movement” can be substantially realized.

  Further, an operation for returning the AV data 202 of the second medium 190 to the first medium 180 will be described with reference to FIG. In this case, since the first medium 180 and the second medium 190 are attached to the same device (for example, the digital television 40 shown in FIG. 1), the double-encrypted AV data 200 of the first medium 180 is stored. Note that it is possible to decrypt.

  First, the double-encrypted AV data 200 of the first medium 180 is decrypted with the identification information 194 of the second medium and the hash value of the AV data 202 (220). The decrypted AV data 182 is stored in the first medium 180. Since this AV data 182 is encrypted only with the identification information 184 of the first medium, it can be decrypted and reproduced using the identification information 184 of the first medium.

  Simultaneously with this decryption, the AV data 202 of the second medium 190 is deleted (222). As a result of the deletion, the area 192 in which the AV data 202 is recorded in the second medium 190 becomes empty.

  In this way, AV data 182 that can be reproduced again is stored in the first medium 180, and this AV data is deleted from the second medium 190. Therefore, it is possible to move data while complying with the copyright protection standard. At this time, there is no problem that only degraded data remains.

  Further, in the system of the present embodiment, the management file is also moved simultaneously with the AV data in order to enable the reproduction to be resumed from the reproduction interruption position. The procedure will be described with reference to FIG. The left column of FIG. 8 shows the contents of the management file recorded on the first medium 180, and the right column of FIG. 8 shows the contents of the management file recorded on the second medium 190.

  First, it is assumed that the management file 250 is recorded on the first medium 180. The AV data pointed to is “304050.mpeg2”, and the reproduction interruption position is “after 100 seconds from the top”.

  As the original AV data is moved to the second medium 190, this management file is also copied to the second medium 190 as it is, and is recorded as the management file 260 on the second medium 190. With this movement, the AV data of the first medium 180 is double-encrypted, but the management file 250 is subjected to processing 252 associated with this double encryption. More specifically, the management file 250 is replaced with a management file 254 in which the contents of the management file 250 are rewritten. In this embodiment, along with double encryption, the extension of the name of the AV data specified by “src =” managed by this management file is rewritten to “encrypted”. As will be described later, when playback is instructed by designating AV data, AV data having the same name as the file name designated by “src =” is searched for in the management file corresponding to the designated AV data. And played. Since the extension of the file name of this part is changed by the processing 252, AV data having this name cannot be found. Accordingly, even if the user instructs to specify and reproduce a double-encrypted file, the reproduction is not executed.

  As described above, it is assumed that reproduction of AV data moved to the second medium 190 is executed by the user and interrupted halfway (262). At this time, the device reproducing the AV of the second medium 190 changes the content of the reproduction interruption position indicated by “begin =” in the management file 260 to a new reproduction interruption position (for example, as shown in FIG. 8). To “200 s”) to create a new management file 266 (the file name is the same).

  When AV data is returned from the second medium 190 to the first medium 180, the management file 254 of the first medium 180 is replaced with the management file 266 of the second medium 190, and a new management file 256 is created. To do. By using this management file 256, the next time the AV data of the first medium 180 is reproduced, the reproduction is resumed from the position designated by “begin =” of the management file 256, that is, the position of 200 seconds from the beginning. The

-Device configuration-
FIG. 9 is a block diagram of the data reproduction / movement management unit 300 related to the mobile phone in the digital television 40. Referring to FIG. 9, this data reproduction / movement management unit 300 includes a large-capacity storage device 314 such as a hard disk, a detachable small-capacity second recording medium 310, a large-capacity storage device 314, and a second storage device 314. A data operation unit 312 for controlling the second recording medium 310 to perform the above-described AV data movement processing, encryption processing, and decryption processing, management file movement (copy) processing, and update processing; Management that manages each functional module included in the unit 312 and operates according to a sequence as will be described later, and executes the movement, encryption, and decryption processing of AV data and the movement processing of the management file as described above. Part 316. FIG. 9 does not particularly show a mechanism for copying AV data from a DVD or the like to a large-capacity storage device 314, for example, but these mechanisms can be easily realized by referring to FIG. is there.

  The large-capacity storage device 314 includes identification information of a reproduction information recording unit 380 for recording reproduction information composed of management files, an AV data recording unit 382 for recording AV data, and a large-capacity storage device 314. And an identification information recording unit 384 for recording.

  The second recording medium 310 includes a reproduction information recording unit 330 for recording reproduction information composed of management files, an AV data recording unit 332 for recording AV data, and identification information of the second recording medium 310. And an identification information recording unit 334 for recording.

  The data operation unit 312 includes a decoding unit 356 for decoding the AV data recorded in the AV data recording unit 382 using the identification information recorded in the recording unit 384, and the AV data decoded by the decoding unit 356. The format conversion unit 358 for converting the format to another format having a smaller data amount, and the output of the format conversion unit 358 is the identification information of the second recording medium 310 recorded in the identification information recording unit 334. A first encryption unit 360 for encryption and recording in the AV data recording unit 332.

  The data operation unit 312 further records the hash value of the AV data encrypted by the encryption unit 360, the identification information of the second recording medium 310 recorded in the identification information recording unit 334, and the identification information recording unit 384. The second encryption unit 362 for encrypting the AV data recorded in the data recording unit 382 with the identification information of the large-capacity storage device 314 and replacing the AV data recorded in the data recording unit 382 At the time of normal reproduction, the AV data recorded in the data recording unit 382 is decrypted with the identification information recorded in the identification information recording unit 384, and the AV data from the second recording medium 310 to the large-capacity storage device 314 is decoded. In the movement process, the double-encrypted AV data recorded in the data recording unit 382 is converted into the hash value of the AV data recording unit 332 and the identification information recording unit 33. Decrypted by using a key created based on the identification information recorded on, and a decoding unit 356 for storing in the data recording unit 382.

  The data operation unit 312 further includes a reproduction unit 354 for reproducing the AV data decoded by the decoding unit 356, and a management file corresponding to the AV data when reproduction by the reproduction unit 354 is interrupted halfway. Is generated and recorded in the reproduction information recording unit 380, and at the start of the next reproduction, the reproduction unit 354 is controlled so as to determine and reproduce the reproduction position according to the management file information recorded in the reproduction information recording unit 380. A reproduction information control unit 352, and a reproduction information update unit 350 for updating a management file accompanying the movement of AV data between the large-capacity storage device 314 and the second recording medium 310.

  Each module of the data operation unit 312 described above executes the processing as described above according to the designated operation mode under the management of the management unit 316.

  FIG. 10 shows an algorithm for realizing an operation associated with data movement / copying of the data reproduction / movement management unit 300 of FIG. When the data reproduction / movement management unit 300 is realized by computer hardware and software executed thereon, a program for controlling the computer hardware may be prepared so as to execute this algorithm. Note that the data reproduction / movement management unit 300 has a function of performing not only data movement but also copying when copying is possible, such as copy-once, and generation of copy control information at that time. Have. In the following description, it is assumed that the data reproduction / movement management unit 300 performs an appropriate operation according to copy control information attached to copy source data when data copy is designated.

  Referring to FIG. 10, first, in step 400, the copy control information of the copy source is confirmed. According to the contents, the following control branches.

  First, if the copy control information is “copy free” or no control information, control is to step 410, if “copy once” is to step 420, if it is “copy never”, to step 430. move on.

  If the copy control information is “copy free” or there is no control information, the data is copied to the copy destination recording medium in step 410. In step 412, “copy free” is set as copy control information for the copied data, and the process ends.

  If the copy control information is “copy once”, the data is copied to the copy destination recording medium in step 420. Subsequently, in step 422, “copy never” is set as copy control information of the copied data, and the process ends.

  When the copy control information is “copy never”, data copy is not allowed. In this case, when copying to another medium, if the copy destination medium can be copy protected, the data is moved (data is copied to the copy destination and the copy source data is deleted). Otherwise, the copy (move) itself is not performed.

  Therefore, first, in step 430, it is determined whether or not the destination medium can be copy protected. For this determination, the attributes of the medium are examined. Check the attributes, and if there is information that copy protection is possible, copy protection is possible. If there is information that protection is not possible, or if the information about copy protection cannot be read in the first place, copy protection is impossible. judge. If the copy destination medium can be copy-protected, control proceeds to step 432, otherwise control proceeds to step 434.

  In step 432, a data movement process is executed, the details of which will be described later with reference to FIG. In step 434, since copy protection cannot be performed, a display indicating that copying or moving of data is not permitted is displayed, and the process is terminated.

  FIG. 11 shows details of the data movement process executed in step 432 of FIG. In the following description, the medium to be moved (copied) is medium A, and the medium to be moved (copied) is medium B. In addition, when data is written to each medium and when data is read from each medium, encryption and decryption are performed based on the identification information of each medium. Not shown to be.

  Referring to FIG. 11, first, in step 460, it is determined whether or not the designated copy is a copy from medium B to medium A. In the case of copying from medium B to medium A, control proceeds to step 476, otherwise control proceeds to step 462.

In step 462, it is determined whether or not the content such as the designated AV data is deteriorated by copying from the medium A to the medium B. That is, when moving from the medium A to the medium B, it is determined whether or not format conversion is necessary to reduce the data amount. If format conversion is necessary, control proceeds to step 464, and if not, control proceeds to step 500. For example, among the 2 hour MPEG2 movies existing on the medium A,
Even when a portion corresponding to 30 minutes of the digest is moved to the medium B in the same format, if data of two hours on the medium A is erased, this corresponds to data deterioration.

  In step 500, the contents are simply moved without performing format conversion. Also in this movement, a procedure is used in which there is no time when reproducible content exists on both the medium A and the medium B at the same time. Naturally, the content is decrypted when reading from the medium A, and the content is encrypted when writing to the medium B. Subsequently, in step 502, the reproduction information (management file) corresponding to the moved file recorded on the medium A is moved to the medium B, and the process is terminated.

  If it is determined in step 462 that format conversion is necessary, the content is first partially copied to medium B in step 464. At this time, decryption of the content data, format conversion, and encryption by the identification information of the medium B are performed. Also, the encryption itself is performed on the entire content data and stored on the memory, and a part thereof is written on the medium B.

  Subsequently, in step 466, the content (original content) of the medium A is encrypted using a key created based on the identification information of the medium B. With this process, the original content of the medium A cannot be decrypted unless at least the medium B is used.

  Further, in step 468, since the content has been moved to another medium B, a process for notifying the user that the medium B is necessary when the content is to be reproduced from the medium A (restoration assisting process). Execute. Here, it is desirable that information indicating which content is moved to which medium (medium B) is recorded on the medium A and displayed to the user.

  Further, in step 470, a process for completing the writing (including encryption) of the content on the destination medium B is executed. What is executed here is a process for enabling the content moved to the medium B to be reproduced. For example, processing such as writing of data serving as a key for reproduction to the medium B, changing the file extension or file name, and the like can be considered. When this process ends, the content can be reproduced using the medium B.

  In step 471, the original content of the medium A is re-encrypted based on the hash value of the content moved to the medium B. In step 472, if there is reproduction information (management file) corresponding to the moved content, the content is converted. See FIG. 8 for an example. Further, since the format is changed, the file name of the content data is changed, so that the contents in the management file need to be changed. In step 474, the management file converted in this way is copied to the medium B, and the process ends.

  On the other hand, in step 476, it is determined whether or not the medium A has a double encrypted content corresponding to the content designated to be moved from the medium B. If the determination result is YES, the control proceeds to step 482, otherwise the control proceeds to step 478.

  In step 478, the content is transferred from medium B to medium A. Again, a procedure is used in which reproducible content data does not exist on both medium A and medium B at the same time. Further, decryption at the time of reading the content from the medium B and encryption at the time of writing the content of the medium A are also executed.

  In step 479, the reproduction information is moved from medium B to medium A, and the process ends.

  On the other hand, in step 482, the double-encrypted content data stored in the medium A is decrypted based on the identification information of the medium B and the hash value of the content data of the medium B. In step 482, the contents of medium B are deleted. Here, however, a procedure is executed so that reproducible content data does not exist on both media A and B at the same time.

  In step 484, the content A content completion process is executed. This process is the same as the process in step 470, but as a result of this process, the content using the medium A can be reproduced.

  In step 486, it is determined whether or not reproduction information exists on the medium A. If it exists, control proceeds to step 492, and if not, control proceeds to step 488.

  In step 492, the content of the supplementary information of the content data stored in the medium A is updated according to the content of the reproduction information of the medium B (if it exists).

  On the other hand, in step 488, the reproduction information existing on the medium B is converted so as to correspond to the change of the content data format. In step 490, the reproduction information converted in this way is copied to the medium A, and the process is terminated.

  FIG. 12 shows, in a block diagram form, a functional portion (referred to as a content movement management unit 530) that is particularly related to content movement in the mobile phone 42 shown in FIG. Referring to FIG. 12, the content movement management unit 530 reproduces content data stored in a detachable recording medium 552 (similar to the second recording medium 310 shown in FIG. 9) or exchanges data with other devices. Has the ability to move.

  The recording medium 552 includes an AV data recording unit 560 for recording AV data as content, and a reproduction information recording unit 562 for recording reproduction information (management file) of the AV data recorded in the AV data recording unit 560. Including.

  The content movement management unit 530 corresponds to the AV data selection unit 540 for allowing the user to select one of the AV data recorded in the AV data recording unit 560, and the AV data selected by the AV data selection unit 540. The corresponding reproduction information selection unit 542 for selecting the reproduction information to be selected from the reproduction information recording unit 562, and the reproduction information selected by the AV data selection unit 542 is the reproduction of the AV data selected by the AV data selection unit 540. A reproduction information validity determination unit 544 for determining whether or not the information is valid.

  The content movement management unit 530 further reads the AV data designated by the AV data selection unit 540 from the AV data recording unit 560 and reproduces it, and the reproduction information validity determination unit 544 confirms that the reproduction information is valid. If determined, the playback information control unit 546 for controlling the playback start position of the AV data by the playback unit 548 according to the content of the playback information, and where the playback is interrupted or ended at the end of playback by the playback unit 548 A reproduction information generation unit 550 for generating reproduction information according to the determination result (deleting if completed) and updating the reproduction information in the reproduction information recording unit 562.

  FIG. 13 shows an algorithm for realizing reproduction of AV data by the content movement management unit 530 in a flowchart format. Referring to FIG. 13, first, in step 590, AV data to be reproduced is selected. In step 592, it is determined whether or not reproduction information corresponding to the designated AV data exists. If not, control proceeds to step 600, where reproduction is started from the beginning of the selected data. On the other hand, if it exists, control proceeds to step 594.

  In step 594, it is determined whether or not the reproduction information corresponding to the selected AV data is valid by checking the keyword described after “meta name =” (see FIG. 4). If valid, control proceeds to step 594. If it is invalid, the control proceeds to step 600 and reproduction is executed from the beginning of the AV data.

  In step 596, it is determined whether or not the AV data specified by the content of the reproduction information selected in step 592 and the AV data selected in step 590 are correctly associated. In step 592, playback information having the same file name and extension “smi” is selected from the file name of the selected AV data, but the playback information has AV data having a format different from that of the initially selected AV data. (The selected AV data and the file name are the same, but have different extensions). Therefore, in this step, the content of the reproduction information is examined, and it is determined whether or not the file name designated by “src =” in the reproduction information matches the file name of the AV data selected first.

  As a result of the check in step 596, if the reproduction information correctly corresponds to the AV data selected first, seek to the reproduction interruption position (reproduction start position) designated by the reproduction information in step 598, and step 600 Then, the reproduction is started from the reproduction interruption position (reproduction start position). If the reproduction information does not correctly correspond to the AV data, in step 600, reproduction is started from the head of the selected AV data.

  Details of the reproduction processing executed in step 600 are shown in a flowchart form in FIG. Referring to FIG. 13, first, at step 620, AV data is reproduced by a predetermined amount. In subsequent step 622, it is determined whether or not the user has performed an operation to stop reproduction. If there is no operation, control proceeds to step 624. If there is an operation to stop reproduction, control proceeds to step 628.

  In step 628, reproduction information indicating the position at which reproduction has been stopped is generated by a time difference from the beginning of the AV data, recorded on the recording medium on which the AV data is recorded, and the process ends.

  On the other hand, in step 624, it is determined whether or not the playback position has reached the end of the AV data as a result of playback. If the end of the AV data has been reached, control proceeds to step 626. Otherwise, control returns to step 620 and repeats playback of AV data.

  In step 626, the reproduction information corresponding to the AV data for which reproduction has been completed is erased from the recording medium, and the process ends. As a result, the next time this AV data is reproduced, the control immediately proceeds to step 600 according to the determination at step 592 in FIG. 1, and the reproduction is started from the beginning of the AV data.

-Operation-
The operation of this system will be described below. Although the mode of operation varies depending on the data, a typical case will be described below.

  First, the reproduction operation of AV data using the management file will be described. Referring to FIG. 15, the AV data recording unit 560 of the recording medium 552 shown in FIG. 12 stores three AV data files as shown in FIG. 15, and the reproduction auxiliary information recording unit 562 stores two AV data files. It is assumed that management files 662 and 664 are stored.

  When the user instructs playback of a video file, only two files 642 that are video files among the AV data recorded in the AV data recording unit 560 of FIG. 12 are selected, and each file is displayed on the display screen 650. Information that identifies is displayed. Assume that the user selects AV data 652 (102030.mpeg) using the AV data selection unit 540 shown in FIG. The corresponding reproduction auxiliary information selection unit 542 converts a management file having a name 680 “102030.smi” in which the extension of the selected AV data 652 (102030.mpeg) is changed to “smi” to the reproduction auxiliary information recording unit 562. Search from inside. In the example shown in FIG. 15, the management file 662 is selected.

  Subsequently, the reproduction auxiliary information validity determination unit 544 determines whether or not the keyword indicated by “meta name =” in the management file 662 is a correct keyword. When the keyword is correct, the reproduction auxiliary information validity determination unit 544 further determines that the file name indicated by “src =” in the management file 662 is the file name of the AV data selected by the AV data selection unit 540 including the extension. It is determined whether or not it matches. In the example shown in FIG. 15, the file name indicated by the contents of the management file 662 and the file name 652 of the selected file are both “102030.mpeg”. As a result, the playback information control unit 546 controls the playback unit 548 to start playback after seeking the playback position from the playback interruption position (playback start position) designated by the management file 662, that is, the position of 100 seconds from the beginning. To do.

  On the other hand, in the example shown in FIG. 16, it is assumed that the file 654 (203040.mpeg) is selected. Then, the corresponding reproduction auxiliary information selection unit 542 searches the reproduction auxiliary information recording unit 562 for a management file having a file name 680 of “203040.smi” whose extension is changed to “smi”. The example shown in FIG. Then, the corresponding file 664 exists.

  As a result of the keyword determination by the reproduction auxiliary information validity determination unit 544, it is assumed that the keyword is correct. Next, the reproduction auxiliary information validity determination unit 544 sets the file name specified by “src =” in the management file 664. Whether the file 654 matches the name of the file 654 is determined. In the example illustrated in FIG. 16, the file name specified by “src =” in the management file 664 is “203040.mp3”, while the name of the selected file 654 is “203040.mpeg”, which do not match. . In this case, the management file is ignored. The playback information control unit 546 controls the playback unit 548 to start playback from the beginning of the selected AV data 654 (203040.mpeg).

  With reference to FIG. 17, the operation of the present system when moving AV data will be described. In the following description, the capacity of the first recording medium is large, whereas the capacity of the second recording medium is small. Therefore, when moving AV data from the first recording medium to the second recording medium, the format is A conversion must be performed.

  First, it is assumed that the AV data 702 (304050.mpeg2) recorded on the first recording medium 700 is instructed to be moved to the second recording medium 704. At this time, according to the procedure described above, the format of the selected AV data 702 is converted from mpeg2 to mpeg4 and stored as AV data 712 in the second recording medium 704. In addition, the corresponding management file stored in the first recording medium 700 is also copied as the management file 714 to the second recording medium 704 after converting the contents in accordance with the format conversion. The name of the management file is the same as that of the first recording medium 700.

  On the other hand, in the first recording medium 700, the designated AV data 702 (encrypted by the identification information of the first recording medium) is further encrypted by the identification information of the second recording medium 704 and the hash value of the AV data 712. Converted into encrypted AV data 710. The extension of the file name is also converted to “encrypted”.

  Thereafter, when the process of moving the AV data 712 (304050.mpeg4) from the second recording medium 704 to the first recording medium is performed, the file 710 of the first recording medium identifies the second recording medium 704. The AV data 702 is restored by decrypting the information and the hash value of the AV data 712. Further, the contents of the management file 720 of the first recording medium 700 are updated according to the contents of the management file 714 of the second recording medium 704.

  With the above procedure, it is possible to start playback on another device from a playback interrupt point in a different device while moving AV data according to the copy protection function.

  Note that once AV data is moved to another recording medium, the original AV data cannot be reproduced without the destination recording medium. On the other hand, when a reproduction operation is to be performed on the original recording medium, it is easier to understand that the data including the moved data is presented to the user in a list format. Therefore, in that case, as shown in FIG. 18, the file name 760 of AV data moved to another recording medium (or the title of AV data, etc.) on the display screen 750 can be displayed immediately. A name and the like are displayed in a list format, and a mark 762 indicating that reproduction is not possible unless a destination recording medium is loaded is also displayed.

  This display can notify the user that the file 760 is not immediately reproducible. Of course, the data display format is not limited to this, and various other display formats can be used. For example, for data that cannot be reproduced as it is, a display format that cannot be selected (a so-called “greyed out” display format using a lighter color than other displays), or a bar that indicates deletion on the file name display It is conceivable that

  If the user selects AV data that cannot be reproduced as such, as shown by the lower screen 770 in FIG. 18, the user is specifically instructed which recording medium to mount. do it. When the user mounts the designated recording medium on the playback apparatus and presses the “return” button 780, the display returns to the screen 750 again. In this case, the mark 762 may be erased.

  When playing back content such as AV data, the content is usually restored from the original recording medium and deleted from the destination recording medium (the content is moved from the destination recording medium to the original recording medium). Let me play). However, it is also possible to play back the content in the (deteriorated) format at the destination without restoring the content from the original recording medium (without moving the content from the destination recording medium to the original recording medium). is there. Accordingly, it may be possible to specify whether the content is to be played after being moved or not to be moved. This is because it may be more convenient for the user to reproduce AV data in a deteriorated format without moving the data, especially when it takes time to reconvert (restore) the format.

  As described above, according to the present embodiment, a management file is separately created and used for managing reproduction information such as a reproduction interruption (start) position for content such as AV data. An apparatus that does not have a function of resuming reproduction from the reproduction interruption position can reproduce the content regardless of the existence of the management file, and the existence of the management file does not adversely affect the reproduction of the content.

  Also, when a content file to be played back is selected, the management file is searched from the file name of the content file. However, before the content file is played back, the management file is correctly placed in the playback interruption (resume) position. The keyword in the management file is used to check whether or not it is for managing the playback function from Furthermore, even when the keyword is correct, whether or not the description of the content file corresponding to the management file stored in the file matches the file name of the first selected content file. Determine. The content file is reproduced from the reproduction interruption (resumption) position only when a result that is correct for any of the determinations is obtained. Therefore, there is no possibility that the content file is reproduced according to the management file which is not correct by mistake.

  In the system according to the present embodiment, even when content data is deteriorated by format conversion when it is necessary to move the content data file for copyright protection, the content before deterioration Data can be restored. Therefore, it is possible to reproduce the content on various devices while following the scheme for protecting the copyright and without losing the original content.

  In addition, in order to specify the reproduction interruption position in the management file, the elapsed time from the reference time such as reproduction start, which does not depend on the content data format, is used. Even if format conversion is performed as the content is moved to a small-capacity recording medium, it is possible to easily resume reproduction from the reproduction interruption position before the format conversion.

  The embodiment disclosed herein is merely an example, and the present invention is not limited to the above-described embodiment. The scope of the present invention is indicated by each of the claims after taking into account the description of the detailed description of the invention, and all modifications within the meaning and scope equivalent to the wording described therein are intended. Including.

It is a figure which shows schematic structure of the system 30 concerning one embodiment of this invention. It is a figure which shows the reproduction | regeneration process of AV data in one embodiment of this invention. It is a figure which shows the correspondence of AV data and the management file in one embodiment of this invention. It is a figure which shows the format of the management file in one embodiment of this invention. It is a block diagram which shows the structure of the functional module for implement | achieving the movement of the AV data in one embodiment of this invention, a copy, and the encryption and decoding accompanying it. It is a figure for demonstrating the data operation at the time of movement of AV data in one embodiment of this invention. It is a figure for demonstrating the data operation at the time of movement (return) of AV data in one embodiment of this invention. It is a figure for demonstrating operation of the management file at the time of movement and return of AV data in one embodiment of this invention. 3 is a functional block diagram of a data reproduction / migration manager 300 having a large-capacity storage device according to one embodiment of the present invention. FIG. It is a flowchart which shows the algorithm which implement | achieves the data reproduction | regeneration / movement management part 300 shown in FIG. It is a flowchart which shows the detail of the data movement process shown to step 432 of FIG. It is a block diagram of the content movement management part 530 which can utilize the removable storage medium with small capacity | capacitance concerning one embodiment of this invention. It is a flowchart which shows the algorithm for implement | achieving the content movement management part 530 shown in FIG. It is a flowchart which shows the detail of step 600 shown in FIG. It is a schematic diagram for demonstrating the operation | movement at the time of reproduction | regeneration of AV data in the system concerning one embodiment of this invention. It is a schematic diagram for demonstrating the operation | movement at the time of reproduction | regeneration of AV data in the system concerning one embodiment of this invention. It is a schematic diagram which shows the movement of the data in the system which concerns on one embodiment of this invention. In the system concerning one embodiment of the present invention, it is a figure showing typically a display screen when reproduction of data already moved is specified. It is a schematic diagram for demonstrating the structure of the recording area in a general recording medium. It is a figure which shows the structure of an example of the system concerning a prior art. It is a schematic diagram for demonstrating the movement procedure of AV data in a prior art. It is a schematic diagram for explaining that display deterioration occurs due to format conversion accompanying movement of AV data, and restoration to the original state becomes impossible.

Explanation of symbols

  30 system, 40 digital television, 42 mobile phone, 44 memory card, 100, 102, 104, 182, 202 AV data, 110, 112, 250, 254, 256, 260, 266 management file, 130 data operation mechanism, 140, 184 medium identification information of the first medium, 142,148 encoder, 144,194 medium identification information of the second medium, 146 second medium data, 152 selector, 154,180 first medium, 156,158 decoder, 190 Second medium, 200 Double-encrypted AV data, 300 Data reproduction / movement management unit, 310 Second storage medium, 312 Data operation unit, 314 Large capacity storage device, 350 Reproduction information update unit, 352 Playback information control unit, 354, 548 playback unit, 356 decoding unit, 3 8 format conversion unit, 360, 362 encryption unit, 530 content movement management unit, 540 AV data selection unit, 542 compatible playback auxiliary information selection unit, 544 playback auxiliary information validity determination unit, 546 playback information control unit, 550 playback information Creation department

Claims (25)

  1. Reproducing means for reproducing data recorded on the first recording medium;
    In response to the reproduction of the data being interrupted by the reproduction means, generating reproduction management information including reproduction interruption position information expressing a position where the reproduction of the data is interrupted, separately from the data, And first reproduction management information generating means for recording on the first recording medium in association with the data;
    In order to copy data recorded on the first recording medium to a removable second recording medium in response to a first copy instruction signal instructing copying of data from the first recording medium First data copy means,
    It is determined whether or not reproduction management information corresponding to data copied to the second recording medium by the first data copying means is in the first recording medium, and if there is, the reproduction management information. And a reproduction management information copying means for copying the data to the second recording medium.
  2. The data reproduction apparatus according to claim 1, wherein the reproduction interruption position information represents a position where reproduction of the data is interrupted using a time difference from a predetermined reference position in the data.
  3. The data reproduction apparatus according to claim 2, wherein the predetermined reference position is a reproduction position at the beginning of the data.
  4. The data is specified by a combination of a file name and attribute information in the first recording medium,
    The first reproduction management information generating unit generates the reproduction management information in response to the reproduction of the data being interrupted by the reproducing unit, and a file obtained by a predetermined conversion from the file name of the data A means for recording the reproduction management information on the first recording medium as a separate file from the data having a name and a predetermined attribute different from that of the data. A data reproducing apparatus according to any one of the above.
  5. The reproducing means includes
    In response to a first reproduction instruction signal instructing reproduction of data in the first recording medium, reproduction management for retrieving reproduction management information associated with the data in the first recording medium Information retrieval means;
    In response to the fact that the reproduction management information associated with the data designated by the first reproduction instruction signal is not retrieved by the reproduction management information retrieval means, the data is reproduced from the beginning, and the reproduction management In response to the information retrieval unit retrieving the reproduction management information associated with the data designated by the first reproduction instruction signal, the data is reproduced from the reproduction interruption position information in the reproduction management information. The data reproducing apparatus according to claim 4, further comprising: means for
  6. The reproduction management information search means includes:
    In response to the first reproduction instruction signal, file name specifying means for specifying the file name of the data;
    Means for searching the first recording medium for reproduction management information that is a file name obtained by a predetermined conversion from the file name of the data and has the predetermined attribute and is separate from the data; The data reproducing device according to claim 5, comprising:
  7. The first reproduction management information generating unit generates the reproduction management information in response to the reproduction of the data being interrupted by the reproducing unit, and the reproduction management information is reproduced in the reproduction management information. Including function specifying information indicating that it has a function as management information, including means for recording on the first recording medium separately from the data and in association with the data;
    The data reproducing device further includes:
    Means for determining whether or not the function specifying information is included in the reproduction management information searched by the means for searching;
    In response to determining that the reproduction management information searched by the searching means includes the function specifying information by the determining means, from the reproduction interruption point by the reproducing means. In response to determining that the reproduction management information retrieved by the retrieval means activates reproduction and does not include the function specifying information, reproduction from the head of the data by the reproduction means is performed. And a means for activating the data reproducing apparatus according to claim 6.
  8. The first reproduction management information generating unit generates the reproduction management information in response to the reproduction of the data being interrupted by the reproducing unit, and the reproduction management information is reproduced in the reproduction management information. Including function specifying information indicating that it has a function as management information and data specifying information for specifying the data together with its attributes, separately from the data and in association with the data Means for recording on one recording medium,
    The data reproducing device further includes:
    Determining means for determining whether or not the function specifying information is included in the reproduction management information searched by the searching means;
    Match detection for detecting a match between data specified by the data specifying information included in the playback management information searched by the search means and data instructed to be played back by the first playback instruction signal Means,
    The determination means determines that the reproduction management information retrieved by the retrieval means includes the function specifying information, and the reproduction is performed in response to a match detected by the match detection means. Activating the reproduction from the reproduction interruption point by the means, and the means for reproducing in response to determining that the reproduction management information retrieved by the retrieval means does not include the function specifying information 7. A data reproducing apparatus according to claim 6, further comprising means for activating reproduction from the head of the data according to.
  9. Further, in response to the completion of the reproduction by the reproducing means until the end of the data in the first recording medium, reproduction management information corresponding to the data is searched in the first recording medium, and 9. The data reproducing apparatus according to claim 1, further comprising means for deleting the reproduction management information, if any.
  10. Further, in response to a second copy instruction signal instructing to copy data from the second recording medium to the first recording medium, the data recorded on the second recording medium is changed to the first recording medium. A second data copy means for copying to the recording medium;
    It is determined whether or not reproduction management information corresponding to data copied to the first recording medium by the second data copying means is in the second recording medium, and if there is, the reproduction management information. The second reproduction management for generating and recording reproduction management information corresponding to the data copied to the first recording medium by the second data copying means in the first recording medium The data reproducing apparatus according to claim 1, further comprising an information generating unit.
  11. Each of the first recording medium and the second recording medium has a read-only area in which unique identification information for specifying the recording medium is recorded,
    The data reproducing apparatus further includes the first recording in which the data is recorded in the reading area of the first recording medium in response to an instruction to record the data on the first recording medium. First encryption means for encrypting with medium identification information and recording on the first recording medium;
    In response to a data reproduction instruction signal for instructing data reproduction, the reproducing means stores the data recorded by the first encryption means in the first recording medium in the first recording medium. 11. The data reproducing apparatus according to claim 10, further comprising a first decryption unit for decrypting using a key created based on the identification information recorded in the read-only area.
  12. The first data copy means includes:
    Means for decoding data designated by the first copy instruction signal using the first decoding means in response to the first copy instruction signal;
    Conversion necessity determining means for determining whether or not format conversion of the data is necessary when copying the data decoded by the first decoding means to the second recording medium;
    In response to determining that format conversion is unnecessary by the conversion necessity determination unit, the data decoded by the first decoding unit is recorded in the read-only area of the second recording medium. A second encryption means for encrypting using a key created based on the identification information and writing to the second recording medium;
    Means for deleting the data from the first recording medium simultaneously with encryption and writing of the data by the second encryption means;
    In response to determining that format conversion is necessary by the conversion necessity determination unit, a format conversion unit for converting the data decoded by the first decoding unit into a predetermined format;
    The data whose format has been converted by the format conversion means is encrypted using a key created based on the identification information recorded in the read-only area of the second recording medium, and is stored in the second recording medium. A third encryption means for writing;
    At the same time that the data whose format has been converted by the third encryption means is written to the second recording medium, the data recorded on the first recording medium is converted into the second recording medium. A third encryption means for encrypting using the key created based on the identification information recorded in the read-only area of the medium and replacing the data in the first recording medium; The data reproducing apparatus according to claim 11.
  13. The second data copy means includes:
    Data presence / absence determining means for determining whether or not data corresponding to the data designated by the second copy instruction signal is present on the first recording medium;
    In response to determining that the corresponding data does not exist on the first recording medium by the data presence / absence determining means, the data recorded on the second recording medium is changed to the second recording medium. A second for decrypting using the key created based on the identification information recorded in the read-only area of the recording medium, giving it to the first encryption means, and writing to the first recording medium Decryption means;
    In response to determining that the corresponding data is present on the first recording medium by the data presence / absence means, the corresponding data recorded on the first recording medium is A third for decoding using the key created based on the identification information recorded in the read-only area of the second recording medium, replacing the corresponding data, and writing to the first recording medium Decryption means of
    Means for deleting the data in the second recording medium simultaneously with the writing of data to the first recording medium by the second decoding means or the third decoding means; The data reproducing apparatus according to claim 12.
  14. Reproducing means for reproducing data recorded on the recording medium;
    In response to the reproduction of the data being interrupted by the reproduction means, generating reproduction management information including reproduction interruption position information expressing a position where the reproduction of the data is interrupted, separately from the data, And a reproduction management information generating means for recording on the recording medium in association with the data.
  15. 15. The data reproduction apparatus according to claim 14, wherein the reproduction interruption position information represents a position where reproduction of the data is interrupted using a time difference from a predetermined reference position in the data.
  16. 16. The data reproduction apparatus according to claim 15, wherein the predetermined reference position is a reproduction position at the beginning of the data.
  17. The data is specified by a combination of a file name and attribute information in the recording medium,
    The reproduction management information generating unit generates the previous reproduction management information in response to the reproduction of the data being interrupted by the reproducing unit, and has a file name obtained by a predetermined conversion from the file name of the data. And a means for recording the reproduction management information on the first recording medium as a separate file from the data having a predetermined attribute different from that of the data. The data reproducing device described in 1.
  18. The reproducing means includes
    In response to a first reproduction instruction signal instructing reproduction of data in the recording medium, reproduction management information search means for searching reproduction management information associated with the data in the recording medium;
    In response to the fact that the reproduction management information associated with the data designated by the first reproduction instruction signal is not retrieved by the reproduction management information retrieval means, the data is reproduced from the beginning, and the reproduction management In response to the information retrieval unit retrieving the reproduction management information associated with the data designated by the first reproduction instruction signal, the data is reproduced from the reproduction interruption position information in the reproduction management information. 18. A data reproducing apparatus according to claim 17, further comprising means for
  19. The reproduction management information search means includes:
    In response to the first reproduction instruction signal, file name specifying means for specifying the file name of the data;
    Means for searching the recording medium for reproduction management information having a file name obtained by a predetermined conversion from the file name of the data and having the predetermined attribute and separate from the data. Item 19. The data reproducing device according to Item 18.
  20. The reproduction management information generating unit generates the reproduction management information in response to the reproduction of the data being interrupted by the reproducing unit, and further, the reproduction management information includes the reproduction management information as reproduction management information. Including means for recording the recording medium separately from the data and in association with the data, including function specifying information indicating that the data has the function of:
    The data reproducing device further includes:
    Means for determining whether or not the function specifying information is included in the reproduction management information searched by the means for searching;
    In response to determining that the reproduction management information searched by the searching means includes the function specifying information by the determining means, from the reproduction interruption point by the reproducing means. In response to determining that the reproduction management information retrieved by the retrieval means activates reproduction and does not include the function specifying information, reproduction from the head of the data by the reproduction means is performed. 20. A data reproducing apparatus according to claim 19, further comprising means for activating the data.
  21. The reproduction management information generating unit generates the reproduction management information in response to the reproduction of the data being interrupted by the reproducing unit, and further, the reproduction management information includes the reproduction management information as reproduction management information. Including the function specifying information indicating that the data has the function and the data specifying information for specifying the data together with the attribute thereof, separately from the data and in association with the data. Means for recording on a medium,
    The data reproducing device further includes:
    Determining means for determining whether or not the function specifying information is included in the reproduction management information searched by the searching means;
    Match detection for detecting a match between data specified by the data specifying information included in the playback management information searched by the search means and data instructed to be played back by the first playback instruction signal Means,
    The determination means determines that the reproduction management information retrieved by the retrieval means includes the function specifying information, and the reproduction is performed in response to a match detected by the match detection means. Activating the reproduction from the reproduction interruption point by the means, and the means for reproducing in response to determining that the reproduction management information retrieved by the retrieval means does not include the function specifying information 20. A data reproducing apparatus according to claim 19, further comprising: means for activating reproduction from the top of the data according to.
  22. Further, in response to the completion of reproduction by the reproduction means until the end of the data in the recording medium, the reproduction management information corresponding to the data is searched in the recording medium, and if there is, the reproduction management The data reproducing apparatus according to any one of claims 14 to 21, further comprising means for deleting information.
  23. The recording medium has a read-only area in which unique identification information for specifying the recording medium is recorded,
    In response to a data reproduction instruction signal for instructing data reproduction, the reproducing means creates data recorded in the recording medium based on identification information recorded in the read-only area in the recording medium. The data reproducing apparatus according to any one of claims 14 to 22, further comprising decryption means for decrypting using the generated key.
  24. A computer program that, when executed by a computer, realizes all the functions according to any one of claims 1 to 23 by the computer.
  25. A computer-readable recording medium on which the computer program according to claim 24 is recorded.
JP2003403890A 2003-12-03 2003-12-03 Data reproducing apparatus, computer program for the same, and recording medium recorded with the computer program Pending JP2005166168A (en)

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Cited By (12)

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