JP4210701B2 - Content management device - Google Patents

Description

This invention relates to content management apparatus for managing a storage medium storing the content that replicated is limited.

With the advancement of digital technology and the price reduction of storage devices, AV (Audio Visual) data such as video and music can be digitally stored in a storage medium and read with high reliability. . Various types of storage media 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 can be used. It has become.

Along with this, various devices for reproducing such AV data have appeared. For example, a DVD player that reproduces AV data stored on a DVD, a hard disk recorder that has a function of storing 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 playback device is for playing back data stored in a storage medium in which identification information is stored . The reproducing apparatus includes, for each storage medium, and the identification information, the data on the storage medium, stores the information indicating the location where playback is interrupted (playback interruption point) to its own storage device. Next, when reproducing the same storage medium, based on the identification information of the storage medium, information indicating the reproduction interruption location is read from the storage device, and reproduction is resumed from that location.

FIG. 19 shows a configuration of a storage area of a storage 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 and the like. Referring to FIG. 19, DVD 800 and memory card 810 have data storage areas 802 and 812 and read-only areas 804 and 814, respectively. The storage medium identification information is stored in these read-only areas 804 and 814 and the like. By reading the identification information stored in the read-only area 804 or 814, the storage medium is identified. Further, information corresponding to the reproduction interruption point is read from the data storage area 802 or 812.

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

In the playback apparatus described in Patent Document 2 described later, information related to the playback interruption location is stored for each data item. By doing so, even if there are a plurality of data items in one storage 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 storage medium such as a memory card, various AV data can be reproduced.

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, a DVD player may be provided with a writing / reading device for a removable storage medium used in a mobile phone. By writing AV data from a DVD player to a storage medium and mounting it on a mobile phone for playback, 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 stored in 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 stored in 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 storage 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 if the AV data reproducing apparatus is different in type, the AV data is written and moved, that is, stored (hereinafter sometimes simply referred to as “move”) and subsequently reproduced . It would be convenient if playback could continue from the point where playback stopped. However, the devices described in Patent Document 1 and Patent Document 2 described above can only be reproduced from the reproduction interruption point only when the same storage medium is reproduced by the same reproduction device. 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, take the procedure of deleting the original data in the middle of copying data to the destination, and then completing the copy of the destination data 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 storage capacity of a small storage 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 storage medium in the same storage format as that stored on a DVD. Therefore, when moving data to a small storage medium, the data format is converted 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 storage 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, the AV data 890 which has been stored in large storage medium 880 of the storage capacity, a case of moving to Do storage medium 900 small storage capacity. Identification information 892 and 902 are stored in the read-only areas of the storage medium 880 and the storage medium 900, respectively. In the CPRM described above, the AV data 890 stored in the storage medium 880 is encrypted using the identification information 892. When moving this AV data 890 to the area 904 of the storage medium 900, the AV data 890 is decrypted using the identification information 892 and then encrypted using the identification information 902 of the storage medium 900. causes stores AV data 910 encrypted in a storage medium 900.

On the other hand, in the storage 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 storage medium 880 is stored becomes a free area. As a result, the AV data is moved from the storage medium 880 to the AV data 890.

With the movement of such data, since the storage capacity of the storage medium 900 is smaller than the storage capacity of the storage medium 880, more data format conversion so that the data capacity is small is performed. 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, the AV data 922 in the large storage media 920 of the storage capacity, a case of moving to Do storage medium 930 small storage 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 storage medium 930 as indicated by the enlargement unit 934 and is no longer a clear image.

Consider a case where the AV data 932 is returned to the original storage medium 920 again. In this case, even if the storage format is converted and the MPEG2 AV data 942 is returned to the storage 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 storage 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, it is an object of the present invention to perform original conversion without causing signal degradation even when a content file subject to copyright management is moved to another storage medium and format conversion is performed for reproduction by another reproduction device. Content management apparatus capable of returning a content file to the storage medium.

A content management apparatus according to a first aspect of the present invention is a content management apparatus for managing a storage medium storing content, and a first content storage means for storing the content in the first storage medium A content converting means for converting the content into a format writable to the second storage medium, and a second for storing the content converted into the format by the content converting means in the second storage medium First content disable means for disabling playback of content on the first storage medium when the content is stored in the second storage medium by the content storage means and the second content storage means And a second non-reproduction for disabling the reproduction of the content on the second storage medium when the reproduction of the content on the first storage medium is enabled. Includes means, and content on the second storage medium, and a reproduction disabling management unit and the content on the first storage medium is controlled so as not to reproducible state at the same time corresponding thereto.

According to the above configuration, the content is stored in the first storage medium by the first content storage unit. The content conversion means converts the content into a format that can be written to the second storage medium. The content converted into the format by the content conversion means by the second content storage means is stored in the second storage medium. When the content is stored in the second storage medium by the second content storage unit, the reproduction of the content on the first storage medium is disabled by the first playback disable unit. At this time, the reproduction disable management unit controls the content on the second storage medium and the corresponding content on the first storage medium so as not to be simultaneously reproducible. Therefore, after the content is stored in the second storage medium, the content cannot be reproduced from the first storage medium. On the other hand, when the reproduction of the content on the first storage medium is enabled, the reproduction of the content on the second storage medium is disabled by the second playback disable means. Therefore, when the content on the first storage medium can be reproduced, the content cannot be reproduced from the second storage medium. As described above, when the content is stored in the second storage medium and when the reproduction of the content of the first storage medium is enabled, the reproduction of the content on the first and second storage media is performed. Since it is simply disabled, there is no risk of data degradation when playback is enabled. As a result, even if the content subject to copyright management is moved to another storage medium and the format conversion is performed for playback by another playback device, the content is not deteriorated in the signal on the original storage medium. Can be returned.
In order to convert the content into a format in which the content can be written to the second storage medium, the content conversion means includes means for converting the content in a format in which the original image quality cannot be stored.

Preferably, unique identification information is stored in the second storage medium, and the content management apparatus stores the second storage when the content is stored in the second storage medium by the second content storage unit. It further includes an encryption means for encrypting the source file using an encryption key including the medium identification information.

Since the content is encrypted with the encryption key including the identification information unique to the second storage medium, the content cannot be decrypted without the second storage medium. Therefore, the content cannot be reproduced from the first storage medium. Since it is necessary to the second storage medium when the enabling the reproduction of the content, the playback Enabling content can reliably remove content that exists in the second storage medium.

More preferably, when the content management device enables reproduction of content on the first storage medium , the content management apparatus uses the identification information unique to the second storage medium as a decryption key to move the content encrypted by the encryption unit. Further comprising means for decrypting the original file.

Since the second storage medium is necessary when the content on the first storage medium can be reproduced, the duplicate file existing on the second storage medium can be surely deleted when the content can be reproduced.

More preferably, when the content is stored in the second storage medium by the second content storage unit , the content management device is predetermined from the identification information of the second storage medium and the content on the second storage medium. And re-encrypting means for re-encrypting the content on the first storage medium using the hash value calculated by the hash function as an encryption key.

The content on the first storage medium is encrypted with an encryption key including identification information unique to the second storage medium and a hash value created from the content on the second storage medium . If there is a storage medium and there is no content in the second storage medium, the content on the first storage medium cannot be decrypted. Also, the content cannot be decrypted when the content on the second storage medium is changed. Therefore, the content cannot be reproduced from the first storage medium. When enabling the reproduction of the content on the first storage medium, the second storage medium storing the content is required. Therefore, when the reproduction of the content on the first storage medium is enabled, the second storage medium is used. The content that exists in can be deleted reliably.

When the content management device enables reproduction of content on the first storage medium, the hash calculated from the identification information of the second storage medium and the content on the second storage medium by a predetermined hash function Decryption means for decrypting the source file using the value as a decryption key may be further included.

When enabling the reproduction of the content on the first storage medium, the second storage medium storing the content is required. Therefore, when the reproduction of the content on the first storage medium is enabled, the second storage medium is used. The content that exists in can be deleted reliably.

Preferably, when the content by second content storage means is stored in the second storage medium, the second storage to impart attributes of the copy not the data in the content on the first storage medium Means for storing content in a second storage medium by storing in the medium is included.

By giving a non-copyable attribute to the content on the second storage medium , secondary content file creation can be prevented. It is possible to limit the number of files on the first storage medium that can be played back to only one.

More preferably, the content converting means including means for performing a predetermined conversion as capacity of the content is reduced.

When the storage capacity of the second storage medium is smaller than the storage capacity of the first storage medium and the content on the first storage medium cannot be directly copied to the second storage medium, the content data conversion means converts the content Thus, a duplicate file for reproducing the same content as the content on the first storage medium can be created on the second storage medium.

More preferably, each of the first and second storage media stores unique identification information. The content on the first storage medium is encrypted using identification information unique to the first storage medium as an encryption key. The second content storage means reads the content on the first storage medium, decrypts the identification information unique to the first storage medium using the decryption key, and stores the decrypted content data in the second storage medium Content data storage means. The content data storage means encrypts the content data on the first storage medium decrypted when storing the decrypted content data using the identification information unique to the second storage medium as an encryption key, Means for storing the content in the second storage medium by adding the attribute and storing the attribute in the second storage medium is included.

When moving the content from the first storage medium to the second storage medium, the content is decrypted using the identification information of the first storage medium as the decryption key and then encrypted with the identification information of the second storage medium. Then, the reproduction of the content is disabled. Therefore, the content can be played back only from the second storage medium.

More preferably, the content management apparatus, which is stored in the first storage medium, displayed in a list format and content name storage means for storing the content name of the content, the content name stored in the content name storage means further comprising a list display means for outputting the part, of the stored content to the content name storage means, that the content stored in the second storage medium, stored in the second storage medium It is characterized by displaying.

By outputting the content name in a list format, the user can easily know the content managed by the content management apparatus. Further, for the second content stored in the storage medium, so that stored in the second storage medium is displayed, but is managed by the content management apparatus, it can not be reproduced from the content management apparatus Can be easily understood by the user.

Of the contents stored in the content name storage means, for the contents moved to the second storage medium, it may be further displayed that the second storage medium is necessary for reproduction.

The user can easily understand that the second storage medium is necessary to reproduce certain contents, and can perform the work for reproducing the desired contents without delay.
A content management apparatus according to a second aspect of the present invention is a content management apparatus for managing a storage medium storing content, and stores the content from the first storage medium to the second storage medium. As a result, when the content on the first storage medium that has been made unplayable is made playable, the presence of the content previously stored in the second storage medium on the first storage medium is determined. Content presence determination means to be confirmed, playback disable means for disabling playback of content on the second storage medium stored from the first storage medium when presence is confirmed by the content presence determination means, The reproduction disable management means for controlling the content on the first storage medium and the corresponding content on the second storage medium so as not to be in a reproducible state at the same time.
Furthermore, the content management apparatus according to the third aspect of the present invention is a content management apparatus for managing a storage medium storing content, and the first content for storing the content in the first storage medium Storage means, content conversion means for converting content into a format that can be written to the second storage medium, and storage of the content converted into the format by the content conversion means in the second storage medium Second content storage means and first playback for disabling playback of content on the first storage medium when the content is stored in the second storage medium by the second content storage means A disabling unit and a second unit for disabling the reproduction of the content on the second storage medium when the reproduction of the content on the first storage medium is enabled. Reproduction disable means, first reproduction disable management means for controlling the contents on the second storage medium and the corresponding contents on the first storage medium so as not to be simultaneously playable, When the content on the first storage medium that has been made unplayable is made playable by storing the content from the first storage medium to the second storage medium, the content is stored on the first storage medium. Content presence determination means for confirming whether or not content previously stored in the second storage medium exists, and second content stored from the first storage medium when presence is confirmed by the content presence determination means 3rd playback disable means for disabling playback of the content on the storage medium, the content on the first storage medium, and the corresponding content on the second storage medium can be played back simultaneously And a second reproduction disabling management means for controlling so as not to state.

As described above, according to the content management apparatus, when the content is stored in the second storage medium, the content cannot be reproduced from the first storage medium, and the content on the first storage medium is reproduced. When enabling, the content cannot be reproduced from the second storage medium. Therefore, at this time, there is no possibility of data degradation or the like. As a result, even if the data subject to copyright management is moved to another storage medium and format conversion is performed for reproduction by another reproduction device, the data is not deteriorated in the original storage medium without causing signal deterioration. Can be returned.

-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, the system 30 includes a large-capacity hard disk (first storage medium), can be attached to the memory card 44 is a storage medium of a small capacity (second storage medium), a memory card 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 stored in the memory card 44 can be reproduced. Mobile phone 42 having a function. The digital television 40 normally reproduces AV data stored in 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 format of the AV data 60 is converted into AV data 64 and written to (stored) in 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. 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 structure-
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 storage 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 store information for specifying the playback interruption location, the playback management information corresponding to the AV data is used. AV data management file 110, 112 comprising to store in the same storage medium 90 as stored.

  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 part “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 stored in the hard disk is manipulated in the digital television 40 according to the present embodiment. With reference to FIG. 5, how the AV data stored in 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 storage 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 (memory card or the like) having a small storage 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 stored again in 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 provided in the first medium 154 as a functional module prepared for returning the AV data (second medium data 146) stored in the second medium to the first medium. The first medium data 154 stored (encrypted with the medium identification information 140 of the first medium and further encrypted with the medium identification information 144 of the second medium and the second medium data 146) is stored. 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 stored in 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 stored in first medium 180 and 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). By this deletion, the area 192 in which the AV data 202 is stored 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 stored in the first medium 180, the right column of Figure 8 shows the contents of the management file stored in the second medium 190.

First, it is assumed that the management file 250 is stored in 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 stored as the management file 260 in 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, the data reproduction / movement management unit 300 includes a large-capacity storage device 314 such as a hard disk, a detachable small-capacity second storage medium 310, a large-capacity storage device 314, and a second storage device 314. A data operation unit 312 for controlling the second storage medium 310 and performing 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 storage unit 380 for storing reproduction information composed of management files, an AV data storage unit 382 for storing AV data, and a large-capacity storage device 314. And an identification information storage unit 384 for storing .

Second storage medium 310, the reproduction information storage unit 330 for storing the reproduction information consisting management file, the AV data storage unit 332 for storing AV data, the identification information of the second storage medium 310 And an identification information storage unit 334 for storing .

Data manipulation unit 312, a decryption unit 356 for decrypting the identification information stored AV data stored in the AV data storage unit 382 in the storage unit 384, the decoded AV data 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 storage medium 310 stored in the identification information storage unit 334. encrypting, and a first encryption unit 360 for storing the AV data storage unit 332.

Data manipulation unit 312 further includes a hash value of the AV data encrypted by the encrypting unit 360, and identification information of the second storage medium 310 stored in the identification information storage unit 334, stored in the identification information storage unit 384 the second encryption unit 362 to replace a has been encrypted AV data stored in the data storage unit 382 by the identification information of the large-capacity storage device 314, AV data stored in the data storage unit 382 When, during normal reproduction decoded by the identification information stored AV data stored in the data storage unit 382 in the identification information storage unit 384, the AV data to the storage device 314 of a large capacity from the second storage medium 310 in the mobile process, the hash value of the encrypted AV data AV data storage unit 332 in duplicate stored in the data storage unit 382, and the identification information storage unit 33 Decrypted by using a key created based on the stored identification information, and a decoding unit 356 for storage in the data storage 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 in the middle create a is stored in the reproduction information storage unit 380, in accordance with information of the management file stored in the reproduction information storage unit 380 at the start of the next reproduction, for controlling the reproduction unit 354 to reproduce decide the playback position 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 storage 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 storage 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 storage 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, even in the case where a portion corresponding to 30 minutes of a digest of a two-hour MPEG2 movie existing on the medium A is moved to the medium B in the same format, the two-hour data on the medium A is deleted. 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) stored in the medium A and corresponding to the moved file is moved to the medium B, and the process ends.

  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 stored in 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 plays back content data stored in a removable storage medium 552 (similar to the second storage medium 310 shown in FIG. 9), or exchanges data with other devices. Has the ability to move.

Storage medium 552, the AV data storage unit 560 for storing the AV data which is the content, the AV data storage unit reproduction information of AV data stored in the 560 (management file) reproducing information storage unit 562 for storing 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 stored in the AV data storage 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 storage unit 562, and the reproduction information selected by the AV data selection unit 542 are 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 storage 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 And a reproduction information creation unit 550 for creating reproduction information according to the determination result (deleting if completed) and updating the reproduction information in the reproduction information storage 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, a position where there is a reproduction stop, creates a reproduction information indicating a time difference from the beginning of the AV data, the AV data is completed the stored processing in a storage medium stored.

  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 storage 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 storage unit 560 of the storage medium 552 shown in FIG. 12, are stored three AV data file, as shown in FIG. 15, also two of the auxiliary reproduction information storage unit 562 It is assumed that management files 662 and 664 are stored.

If the user has instructed reproduction of the video file, among the AV data stored in the AV data storage unit 560 in FIG. 12, only two files 642 is a video file can be selected and the respective display screen 650 files The 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 playback auxiliary information selection unit 542 changes the extension of the selected AV data 652 (102030.mpeg) to “smi” and stores a management file having the name “68030.smi” 680 in the playback auxiliary information storage 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 storage unit 562 for a management file having a file name 680 of “203040.smi” with the extension 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 storage medium is large while the capacity of the second storage medium is small. Therefore, the format is used when moving AV data from the first storage medium to the second storage medium. A conversion must be performed.

First, it is assumed that the AV data 702 (304050.mpeg2) stored in the first storage medium 700 is instructed to be moved to the second storage 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 storage medium 704. In addition, the corresponding management file stored in the first storage medium 700 is also converted in accordance with the format conversion, and then copied to the second storage medium 704 as the management file 714. The name of the management file is the same as that of the first storage medium 700.

On the other hand, in the first storage medium 700, the designated AV data 702 (encrypted by the identification information of the first storage medium) is further encrypted by the identification information of the second storage 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 AV data 712 (304050.mpeg4) is carried out in the first storage medium from the second storage medium 704, the file 710 of the first storage medium to identify the second storage 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 storage medium 700 are updated according to the contents of the management file 714 of the second storage 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 storage medium, the original AV data cannot be reproduced without the destination storage medium. On the other hand, when a reproduction operation is to be performed on the original storage medium, it is easier to understand that the data including the moved data is presented to the user in a list format. Therefore, in this case, as shown in FIG. 18, the file name 760 of AV data moved to another storage medium (or the title of AV data, etc.) on the display screen 750 can be displayed immediately. A list 702 is displayed together with names and the like, and a mark 762 indicating that reproduction is not possible unless a destination storage 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, a display format that cannot be selected for data that cannot be reproduced as it is (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 in such a manner, as shown by the lower screen 770 in FIG. 18, the user is specifically instructed which storage medium to install. do it. When the user inserts the designated storage medium into 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.

Note the movement, when the reproduction of the content, such as AV data, typically restored from the original storage medium content, and deleted from the destination storage medium (content from the destination storage medium to the original storage medium Let me play). However, it is also possible to reproduce the content in the (deteriorated) format at the destination without restoring the content from the original storage medium (without moving the content from the destination storage medium to the original storage 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 content is moved to a small-capacity storage medium, it is possible to easily resume playback from the playback interruption position before 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 claim in 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 storage area in a common storage 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 reproduction auxiliary information selection unit, 544 reproduction auxiliary information validity determination unit, 546 reproduction information control unit, 550 reproduction information Creation department

Claims (6)

A content management apparatus for managing a storage medium storing content,
First content storage means for storing content in a first storage medium;
Content conversion means for converting the content into a format writable to the second storage medium;
Second content storage means for storing the content converted into the format by the content conversion means in the second storage medium;
First reproduction disable means for disabling reproduction of content on the first storage medium when content is stored in the second storage medium by the second content storage means;
Second playback disable means for disabling playback of content on the second storage medium when enabling playback of content on the first storage medium;
Replay disable management means for controlling the content on the second storage medium and the corresponding content on the first storage medium so as not to be replayable simultaneously ;
Unique identification information is stored in the second storage medium,
The content management device further includes:
When content is stored in the second storage medium by the second content storage means, the content on the first storage medium is stored using an encryption key including identification information of the second storage medium. Encryption means for encryption;
On the first storage medium encrypted by the encryption means, using identification information unique to the second storage medium as a decryption key when enabling the reproduction of the content on the first storage medium And a means for decrypting the content . When content is stored in the second storage medium by the second content storage means, the second storage medium is provided with a non-copyable attribute added to data in the content on the first storage medium. The content management apparatus according to claim 1, further comprising means for storing the content in the second storage medium by storing the content in the second storage medium. Each of the first and second storage media stores unique identification information,
The content on the first storage medium is encrypted using identification information unique to the first storage medium as an encryption key,
The second content storage means reads the content on the first storage medium, decrypts the identification information unique to the first storage medium using a decryption key, and decrypts the decrypted content data with the second content data Content data storage means for storing in a storage medium,
The content data storage means encrypts the content data on the first storage medium decrypted when storing the decrypted content data using the identification information unique to the second storage medium as an encryption key. The content management according to claim 1, further comprising means for storing the content in the second storage medium by assigning a non-copyable attribute and storing the attribute in the second storage medium. apparatus. Content name storage means for storing the content name of the content stored in the first storage medium;
List display means for outputting the content names stored in the content name storage means to the display unit in a list format;
2. The content stored in the second storage medium among the contents stored in the content name storage means is displayed as stored in the second storage medium. The content management device according to claim 3 . Of the content stored in the content name storage means, the content stored in the second storage medium further displays that the second storage medium is necessary for reproduction. The content management apparatus according to claim 4 . By having stored content before Symbol from said first storage medium second storage medium, when to reproducible the content on the first storage medium being played disabled, the first Content presence determination means for confirming whether there is content previously stored in the second storage medium on the storage medium;
A third reproduction disabling unit for disabling the reproduction of the content on the second storage medium stored from the first storage medium when existence is confirmed by the content existence determination unit;
Further comprising a content on the first storage medium, and a second reproduction disabling management unit and the content on the second storage medium is controlled so as not to reproducible state at the same time the corresponding, billing Item 2. The content management device according to Item 1 .

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