Abstract:
The present invention provides a content management device manages not to reproduce a part of contents in output source/destination concurrently, and manages to reproduce the whole contents in the original sequence continuously. 
     A content management device is a device for managing reproduction of content from the first medium for which data corresponding to a part of the content output to the second medium. This device includes an outputting circuitry configured to output data corresponding to the part of the content, and a reproduction controller configured to disable reproduction of the part of the content recorded in the first medium when the outputting circuitry outputs the data corresponding to the part.

Description:
BACKGROUND OF THE INVENTION 
     (1) Field of the Invention 
     The present invention relates to a content management device to manage reproduction of a content after the content being moved. 
     (2) Description of the Related Art 
     In recent years, a Digital Video Recorder is popular for recording a received broadcasting signal for Standard-definition Television (SDTV, analog broadcasting) into Hard Disk Drive (HDD) and optical disks such as Digital Versatile Disc Random Access Memory (DVD-RAM) by digitalizing and further encoding and compressing. Furthermore a digital video recorder, which is able to record satellite/terrestrial broadcasting signals for High-definition Television (HDTV), has been introduced into the market. 
     The digital broadcasting signal is characterized in that the qualities of video/audio are not deteriorated even after repeated duplications, unlike the analog broadcasting signal. It is, therefore, very significant to establish a rule to prevent from copying illegally so as to protect the copyright of content. Regarding the digital broadcasting signal, a copy control information is multiplexed in the digital video/audio contents, and thus a rule called copy-once, that allows to record a broadcasting signal only once when the broadcasting signal is received, has been introduced. Hence the copyright of content is protected. 
     Once the digital video/audio content with copy-once is recorded into a recording medium such as HDD and DVD-RAM, the copy control information is shifted to non-duplicable control information at that time, and the duplication of the content is prohibited. Yet it is allowed to move the content from a recording medium which has the content (a first recording medium) to another recording medium (a second recording medium). 
     One example of a technique related to duplication is disclosed in Japanese Laid-Open Patent application No. 2002-358241, “Copy management method of content, recording/reproducing device and reproducing device”. According to the technique in this example, the same number of virtual contents as the number of rights for duplicable times is available for a user, and the virtual content is moved at the time of duplication, while the virtual content in the source is deleted. Moreover it is disclosed that the number of rights for duplicable times are increased in the destination and are decreased in the source by the number of performed moving for duplication so as to protect from illegal duplication. 
     SUMMARY OF THE INVENTION 
     It is allowed to move a content from the first recording medium to the second recording medium, however the content recorded in the first recording medium is processed to prevent from reproducing. This process means to inactivate the reproduction. Consequently, for example, when the content in deteriorated quality is moved from the first recording medium to the second recording medium (e.g. memory card) so as to reproduce the content by a portable terminal device, only the content in deteriorated quality is available for reproduction. A technique can, therefore, be conceivable to be provided to manage the pre-moving content and the moved content to limit the reproduction of both contents concurrently so as to protect the copyright of the content, as well as to reproduce the content in high quality like the pre-moving content. 
     On the other hand, moving a part of the content may be required by user so as to, for example, make the content size to be stored into the second recording medium small. For example, when a content from TV program is moved, the user wants to move the content excluding the part of commercial messages. However conventionally, there is no method to manage both the part of the pre-moving content and the part of the moved content so as to reproduce the pre-moving content and, at the same time, not to reproduce the part of the pre-moving content and the part of the moved content concurrently. Thus the method to meet this demand is requested. And also when the part of the content is moved, it has not been possible to reproduce both the part of the moved content and the part of the content not to be moved in the original sequence continuously with conventional method. The method to make the above-mentioned function available is, therefore, requested. 
     In view of aforementioned problems, an object of the present invention is to provide a content management device for 1) outputting a part of a content, for 2) not reproducing the part of the content in the source and in the destination concurrently, and for 3) reproducing the whole content in the original sequence continuously. 
     In order to achieve the object, the content management device in the present invention is a device for managing reproduction of content from the first medium for which data corresponding to a part of the content output to the second medium. This device includes an outputting circuitry configured to output data corresponding to the part of the content, and a reproduction controller configured to disable reproduction of the part of the content recorded in the first medium when the outputting circuitry outputs the data corresponding to the part. 
     The content management device may further include an identifier assigning circuitry configured to assign the first identifier to the part of the content recorded in the first medium, and to assign the second identifier to the data corresponding to the part of the content output. 
     The content management device may further include a medium identifier circuitry configured to obtain identifiers of the first medium and the second medium. 
     The content management device may further include a memory for storing an identifier of the first medium, an identifier of the second medium, the first identifier corresponding to the part of the content recorded in the first medium, and the second identifier corresponding to the data corresponding to the part of the content output. 
     The content management device may further include a controller configured to control recording the first identifier in the first medium and recording the second identifier in the second medium. 
     The content management device may further include a reproducing circuitry configured to reproduce the content after the outputting circuitry outputs data corresponding to the part of the content. 
     The identifier assigning circuitry may be further configured to assign a remainder identifier to a part of the content that was not output. 
     The controller may be further configured to control recording a remainder identifier corresponding to a part of the content that was not output into the first medium, in the case where the outputting circuitry outputs the part of the content. 
     The reproducing circuitry may be configured to reproduce the content after the outputting circuitry outputs the part of the content in the case where a remainder identifier corresponding to a part of the content that was not output is stored. 
     The reproducing circuitry may be further configured to reproduce the content by utilizing one of or both of a head position and an end position for the part of the content recorded in the first medium, in the case where the outputting circuitry outputs the part of the content. 
     The reproducing circuitry may be further configured to reproduce the content by reproducing a part of the content that was not output and the part of the content of which reproduction inactivated by the reproduction controller. 
     The reproducing circuitry may be further configured to reproduce the content by reproducing a part of the content that was not output and the part of the content output. 
     The content management device may further include medium identification circuitry configured to determine whether or not the second medium is a medium in which data can be recorded and the outputting circuitry may be configured to output the part to the second medium, in the case where the second medium is determined to be capable of recording data. 
     The content management device may further include encryption circuitry configured to encrypt data representing the data corresponding to the part output, and decryption circuitry to decrypt data encrypted by the encryption circuitry. 
     The content management device may further include conversion circuitry configured to convert the quality of the part of the content to be outputted by the output circuitry, and the output circuitry may be configured to output the part of the content converted by the conversion circuitry to the second medium. 
     The conversion circuitry may be, based on an instruction from outside, configured to activate the part of the content of which reproduction is disabled by the reproduction controller, and to convert the quality of the part of the content. 
     The conversion circuitry may be further configured to convert, in the case where the content is a video signal, a part of or all of compression modes, bit rates, image sizes and frame rates for the video signal, and to convert, in the case where the content is an audio signal, a part of or all of compression modes, bit rates, number of samplings and number of channels for the audio signal. 
     A content management method in the present invention is a method for managing reproduction of content from the first medium for which data corresponding to a part of the content is to be copied to the second medium, for outputting data corresponding to the part of the content recorded in the first medium and for disabling reproduction of the part of the content recorded in the first medium, in the case where data corresponding to the part of the content has been output. 
     The content management method may further include the steps of assigning a first identifier to the part of the content recorded in the first medium, and assigning a second identifier to the data corresponding to the part of the content output. 
     The content management method may further include the step of obtaining identifiers of the first medium and the second medium. 
     The content management method may further include the step of storing the identifier of the first medium, the identifier of the second medium, the first identifier corresponding to the part of the content recorded in the first medium, and the second identifier corresponding to the data corresponding to the part of the content output. 
     The content management method may further include the step of controlling recording of the first identifier in the first medium and recording the second identifier in the second medium. 
     The content management method may further include the step of reproducing the content after outputting the data corresponding to the part of the content. 
     The content management method may further include the step of assigning a remainder identifier to a part of the content that was not output. 
     The content management method may further include the step of controlling recording of a remainder identifier corresponding to a part of the content that was not output into the first medium, in the case where data corresponding to the part is output. 
     The content management method may further include the step of reproducing the content after outputting the part of the content in the case where a remainder identifier corresponding to a part of the content that was not output. 
     The content management method may further include the step of reproducing the content by utilizing one of or both of a head position and an end position for the part of the content recorded in the first medium, in the case where outputs the part of the content is output. 
     The content management method may further include the step of reproducing a part of the content that was not output and the part of the content for which reproduction was disabled. 
     The content management method may further include the step of reproducing a part of the content that was not output and the part of the content for which corresponding data was output. 
     The content management method may further include the steps of determining whether or not the second medium is a medium in which data can be recorded, and outputting the part to the second medium, in the case where the second medium is determined to be capable of recording data. 
     The content management method may further include the step of encrypting data representing the data corresponding to the part output. 
     The content management method may further include the step of converting the quality of the part of the content to be outputted. 
     A program for managing reproduction of content from the first medium for which data corresponding to a part of the content is to be copied to the second medium, the program causing a computer to execute outputting data corresponding to the part of the content recorded in the first medium and disabling reproduction of the part of the content recorded in the first medium, in the case where data corresponding to the part of the content has been output. The program is stored in CD-ROM and the program can be utilized through the transmission media such as communication network. 
     The present invention is able to provide the content management device for 1) outputting a part of a content, for 2) not reproducing the part of the content in the source and in the destination concurrently, and for 3) reproducing the whole content in the original sequence continuously. 
     According to the present invention, the part of the content in the source and in the destination are not reproduced concurrently even in the case when the data rate and the resolution for the part of the digital video/audio content are deteriorated by re-encoding and compressing, and subsequently the part of the content is outputted to the external recording medium, and it is possible to reproduce the whole of the content in the original quality. Besides it is possible to restore the original content repeatedly, the reproduction can, therefore, be reattempted even after failure of re-encoding and compressing. 
     Further Information About Technical Background to this Application 
     The disclosure of Japanese Patent Application No. 2004-347542 filed on Nov. 30, 2004 including specification, drawings and claims is incorporated herein by reference in its entirety. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and other objects, advantages and features of the invention will become apparent from the following description thereof taken in conjunction with the accompanying drawings that illustrate a specific embodiment of the invention. In the Drawings: 
         FIG. 1  is perspective views of a content management device  1  and a portable recording medium  2  in the first embodiment. 
         FIG. 2  is a block diagram illustrating a configuration of the content management device  1  and the portable recording medium  2  in the first embodiment. 
         FIG. 3  is a diagram to describe moving a part of a content in the first embodiment. 
         FIG. 4  is a first flowchart showing an operation of the content management device  1  in the first embodiment. 
         FIG. 5  is a diagram of content information in the first embodiment. 
         FIG. 6  is a second flowchart showing an operation of the content management device  1  in the first embodiment. 
         FIG. 7  is a block diagram illustrating a configuration of a content management device  100  and the portable recording medium  2  in the second embodiment. 
         FIG. 8  is a diagram to describe moving a part of a content in the second embodiment. 
         FIG. 9  is a block diagram illustrating a configuration of a content management device  101  and the portable recording medium  2  in the third embodiment. 
         FIG. 10  is a diagram to describe moving the whole content. 
         FIG. 11  is a diagram to describe moving a part of a content again and the effect of the content management device. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The preferred embodiments for the present invention will be described hereinafter using the drawings. 
     The First Embodiment 
     A configuration of a content management device  1  in the first embodiment will be described using  FIG. 1  and  FIG. 2 . 
       FIG. 1  is perspective views of the content management device  1  and the portable recording medium  2  in the first embodiment. The content management device  1  is an device for moving a content into a disc-shaped portable recording medium  2  and also for reproducing the content. When the content management device  1  moves a content into the portable recording medium  2 , the device  1  does not delete the content but change the status of the content to the status of reproduction being inactivated, yet the content is still restorable later. The portable recording medium  2  is a medium for storing contents as one example of the second recording medium. The first recording medium in the first embodiment is hereinafter described as a content storage unit  13  and the unit  13  is mounted in the content management device  1 . 
       FIG. 2  is a block diagram illustrating a configuration of the content management device  1  and the portable recording medium  2 . As shown in  FIG. 2 , the content management device  1  includes a receiving unit  11 , a controlling unit  12 , the content storage unit  13 , a judging unit  14 , a converting unit  15 , an identifier generating unit  16 , an identifier assigning unit  17 , a move processing unit  18 , an reproduction inactivating unit  19 , a medium identifier obtaining unit  20 , a management information storage unit  21 , a content identifier obtaining unit  22  and a reproducing unit  23 . The functions for each unit configuring the content management device  1  will be described together with a description of the operation of the content management device  1  hereinafter. 
     The operation of the content management device  1  in the first embodiment will be described. 
     In the first embodiment, suppose that a digital signal such as terrestrial digital broadcasting signal is already received by the receiving unit  11 , and is stored as the first content  111  in the content storage unit  13  by the controlling unit  12 . And suppose that the aforesaid digital signal is restricted by copy-once and the stream is coded by MPEG 2 standard. 
     In addition, in the first embodiment, suppose that the content management device  1  moves a part of the first content  111  to the portable recording medium  2 . More specifically, as shown in  FIG. 3 , suppose that the first content  111  stored in the content storage unit  13  is divided into four contents from content T 0  to content T 3 , and content T 1  (or represented as “content Ta 1 ”) and content T 3  (or represented as “content Ta 3 ”) are moved into the portable recording medium  2 . 
     Furthermore, suppose the whole of the first content  111  is reproduced by the content management device  1  afterward. 
     (Moving a Part of a Content) 
     First, the case when content T 1  and content T 3 , that are the parts of the first content  111 , being moved into the portable recording medium  2  will be described using  FIG. 4 .  FIG. 4  is a flowchart of each operation at the time of moving content T 1  and content T 3  into the portable recording medium  2 . 
     Suppose that the positions of content T 1  and content T 3 , to be moved partly, in the stream are as follows: the head position is pi 0  and the end position is po 0  for content T 1 , and the head position is pi 1  and the end position is po 1  for content T 3 . 
     The judging unit  14  reads medium information in the content storage unit  13  and medium information in the portable recording medium  2 , and judges whether or not the content storage unit  13  and the portable recording medium  2  are the media in which the content, stored in the content storage unit  13 , can be moved (S 1 ). For example, the judging unit  14  judges whether or not the content storage unit  13  and the portable recording medium  2  are the media in which the recorded data can be rewritten. At the same time, the judging unit  14  judges whether or not the content storage unit  13  and the portable recording medium  2  are the media equipped with copyright protection. And then the judging unit  14  judges whether or not the content storage unit  13  and the portable recording medium  2  are the media in which the content can be moved based on the two judgments (S 1 ). More particularly when the content storage unit  13  is a sort of write-once recording medium, the recorded data can not be deleted. Hence the judging unit  14  judges that the content storage unit  13  is a medium in which the content cannot be moved (No in S 1 ). And when the portable recording medium  2  is a sort of rewritable medium like DVD+RW without copyright protection, the judging unit  14  judges that the portable recording medium  2  is a medium in which the content can not be moved (No in S 1 ). When the judging unit  14  judges that the content storage unit  13  or the portable recording medium  2  is not the medium in which the content can be moved (No in S 1 ), the content management device  1  notifies the judgment outward and terminates the operation. 
     On the other hand when the judging unit  14  judges that the content storage unit  13  and the portable recording medium  2  are the media in which the content can be moved (Yes in S 1 ), the each unit of the content management device  1  performs followings. 
     The controlling unit  12  reads the stream from head position pi 0  till end position po 0  for content T 1  and the stream from head position pi 1  till end position po 1  for content T 3  sequentially (S 2 ). 
     The converting unit  15  converts content T 1  and content T 3  into such as deteriorated quality of video/audio of encoded compressed content T 1  and content T 3 . For example, the converting unit  15  decodes encoded compressed content T 1  and content T 3  into video/audio signals of the baseband, and encodes and compresses the decoded video/audio signals according to parameters so as to generate the converted stream (S 3 ). As for the parameter for video, the information to specify such as a compressed mode, a video size, a bit rate and frame rate can be exemplified. And as for the parameter for audio, the information to specify such as a compressed mode, a bit rate, the number of samplings and the number of channels can be exemplified. More specifically in the case where the first content  111  including content T 1  and content T 3  is the stream of HDTV broadcasting signal, the portable recording medium  2  is a DVD-RAM, and the converting unit  15  converts the content of HDTV broadcasting signal into the content of SDTV broadcasting signal, the converting unit  15  performs followings. Particularly the converting unit  15  converts the video size from HD size (e.g. 1920×1080 interlace) into SD size (e.g. 720×480 interlace). And regarding the audio signal, the converting unit  15 , for example, converts AAC mode into AC-3 mode which are used in broadcasting. And also the converting unit  15  converts the bit rate for content T 1  and content T 3  to the amount approximately not more than 10 Mbps including the audio signals. And the parameter may be determined beforehand or may be set by a user. 
     Hereinafter contents T 1  and T 3  before being converted by the converting unit  15  are represented by pre-converted content Ta 1  and pre-converted content Ta 3  respectively, and contents T 1  and T 3 , converted by the converting unit  15 , are represented by converted content Tb 1  and converted content Tb 3  as shown in  FIG. 3 . 
     As additional matter, the converting unit  15 , as mentioned above, may convert in different compressing modes for the pre-converted content and the converted content. Concerning to the compressing modes, MPEG1, MPEG2, MPEG4, H.264, DV compressing and so on are included. 
     The identifier generating unit  16  generates identifier “B 0 ” to be assigned to content T 0 , that is stored in the content storage unit  13  and not to be moved, and also generates identifier “B 2 ” to be assigned to content T 2 , that is stored in the content storage unit  13 , not to be moved (S 4 ). And the identifier generating unit  16  generates identifier “C 1 ” to be assigned to pre-converted content Ta 1 , and also generates identifier “C 3 ” to be assigned to pre-converted content Ta 3  (S 4 ). Moreover the identifier generating unit  16  generates identifier “D 1 ” to be assigned to converted content Tb 1 , and also generates identifier “D 3 ” to be assigned to converted content Tb 3  (S 4 ). 
     The identifier generating unit  16  generates each identifier using information on a manufacturer manufactured the content management device  1 , information on the content management device  1  (e.g. a serial number of the content management device  1 ) and information on the converted time/date of a content, a random number and so on. 
     The identifier assigning unit  17  deletes identifier A assigned to the first content  111  stored in the content storage unit  13 , assigns identifier “B 0 ” to content T 0  not to be moved, and assigns identifier “B 2 ” to content T 2  not to be moved as shown in  FIG. 3  (S 4 ). And also the identifier assigning unit  17  assigns identifier “C 1 ” to pre-converted content Ta 1 , and assigns identifier “C 3 ” to pre-converted content Ta 3  (S 4 ). Moreover the identifier assigning unit  17  assigns identifier “D 1 ” to converted content Tb 1 , and assigns identifier “D 3 ” to converted content Tb 3 . 
     The move processing unit  18  records the stream converted by the converting unit  15 , that are converted content Tb 1  and converted content Tb 3 , in the portable recording medium  2  (S 5 ). At this moment, the move processing unit  18  records identifier “D 1 ” of converted content Tb 1  and identifier “D 3 ” of converted content Tb 3  in the portable recording medium  2  by putting the identifiers in the aforesaid stream (S 5 ). For example, the move processing unit  18  records identifier “D 1 ” of converted content Tb 1  and identifier “D 3 ” of converted content Tb 3  in the user area within the stream. As additional matter, the move processing unit  18  performs recording after scramble processing based on a copyright protection such as CPRM, when the move processing unit  18  records converted content Tb 1  and converted content Tb 3  in the portable recording medium  2 . At that time, the move processing unit  18  records identifier “D 1 ” and identifier “D 3 ” as well in a user area within the stream after scramble processing. 
     When the move processing unit  18  records converted content Tb 1  and converted content Tb 3  in the portable recording medium  2 , the reproduction inactivating unit  19  places pre-converted content Ta 1  and pre-converted content Ta 3  stored in the content storage unit  13  in a status of reproduction being inactivated, subject to be able to activate the contents later (S 5 ). For example, the reproduction inactivating unit  19  converts pre-converted content Ta 1  and pre-converted content Ta 3  into invalid data by encrypting, and then pre-converted content Ta 1  and pre-converted content Ta 3  are inactivated. Or the reproduction inactivating unit  19  assigns pointers to both head position pi 0  and end position po 0  for pre-converted content Ta 1  and head position pi 1  and end position po 1  for pre-converted content Ta 3 . And the reproduction inactivating unit  19  inactivates pre-converted content Ta 1  and pre-converted content Ta 3  subject not to be reproduced, by skipping compulsory from head position pi 0  to end position po 0  for pre-converted content Ta 1  and also by skipping compulsory from head position pi 1  to end position po 0  for pre-converted content Ta 3 , when the first content  111  including pre-converted content Ta 1  and pre-converted content Ta 3  stored in the content storage unit  13  are reproduced. 
     The medium identifier obtaining unit  20  obtains an identifier of the recording medium (S 6 ). More specifically the medium identifier obtaining unit  20  obtains medium identifier α, the identifier of the content storage unit  13 , out of the storage unit  13 , and obtains medium identifier β, the identifier of the portable recording medium  2 , out of the portable recording medium  2  (S 6 ). 
     The controlling unit  12  obtains file management information FA including information to specify the stored location for content T 0 , pre-converted content Ta 1 , content T 2  and pre-converted content Ta 3  in the content storage unit  13  (S 7 ). 
     The controlling unit  12  records medium identifiers, that is the identifier related to the content storage unit  13 , in the management information storage unit  21  by associating with identifier “B 0 ” of content T 0 , identifier “B 2 ” of content T 2 , identifier “C 1 ” of pre-converted content Ta 1  and identifier “C 3 ” of pre-converted content Ta 3  as shown in  FIG. 5  (S 8 ). At that time, the controlling unit  12  records head position pi 0  and end position po 0  for pre-converted content Ta 1  and head position pi 1  and end position po 0  for pre-converted content Ta 3  on the original stream in the management information storage unit  21  by associating with medium identifier α and so on (S 8 ). And also the controlling unit  12  records the file management information FA in the management information storage unit  21  by associating with medium identifier α and so on (S 8 ). Furthermore the controlling unit  12  deletes the file management information FA in the content storage unit  13 . 
     Additionally the controlling unit  12  records medium identifier β, that is the identifier related to the portable recording medium  2 , in the management information storage unit  21  by associating with the identifier “D 1 ” of converted content Tb 1  and identifier “D 3 ” of converted content Tb 3  (S 8 ). Hereinafter, the information to be stored in the management information storage unit  21  is simply called “content information”. 
     (Moving to the Counter Direction and Reproducing) 
     It will be described about the case when the first content  111  being activated (moving to the counter direction) and reproduced after converted content Tb 1  and converted content Tb 3 , which are the part of the first content  111 , are moved to the portable recording medium  2  using  FIG. 6 .  FIG. 6  is a flowchart for an operation of the case, when the first content  111  is activated and reproduced after converted content Tb 1  and converted content Tb 3  are moved. 
     The judging unit  14  judges whether or not the content storage unit  13  and the portable recording medium  2  are the media in which converted content Tb 1  and converted content Tb 3  can be moved to the counter direction after moved to the portable recording medium  2  (S 11 ). For example, the judging unit  14  judges whether or not the content storage unit  13  and the portable recording medium  2  are the media in which the recorded data can be rewritten, like the case as converted content Tb 1  and converted content Tb 3  are moved to the portable recording medium  2 . At the same time, the judging unit  14  judges whether or not the content storage unit  13  and the portable recording medium  2  are the media equipped with copyright protection. And the judging unit judges whether or not the content storage unit  13  and the portable recording medium  2  are the media in which the contents can be moved to the counter direction (S 11 ). When the judging unit  14  judges that the content storage unit  13  or the portable recording medium  2  are not the media in which the contents can be moved to the counter direction (No in S 11 ), the content management device  1  notifies the judgment outward, and terminates the operation. 
     On the other hand, when the judging unit  14  judges that the content storage unit  13  and the portable recording medium  2  are the media in which the contents can be moved to the counter direction (Yes in S 11 ), the each unit of content management device  1  performs followings. 
     The medium identifier obtaining unit  20  obtains an identifier of the recording medium (S 12 ). More specifically, the medium identifier obtaining unit  20  obtains medium identifier α, that is the identifier of the content storage unit  13  and also obtains medium identifier β, that is the identifier of the portable recording medium  2  (S 12 ). 
     The content identifier obtaining unit  22  obtains identifier “B 0 ” of content T 0 , identifier “B 2 ” of content T 2 , and identifier “C 1 ” of pre-converted content Ta 1  and identifier “C 3 ” of pre-converted content Ta 3  from the content storage unit  13  (S 13 ). Furthermore the content identifier obtaining unit  22  obtains identifier “D 1 ” of converted content Tb 1  and identifier “D 3 ” of converted content Tb 3  from the portable recording medium  2  (S 13 ). Besides pre-converted content Ta 1  and pre-converted content Ta 3 , in a status of reproduction being inactivated, are stored in the content storage unit  13 . 
     The controlling unit  12  obtains a file management information FA from the content storage unit  13  (S 14 ). 
     The judging unit  14  judges whether or not the all identifiers, that being obtained by the medium identifier obtaining unit  20  and the content identifier obtaining unit  22 , are included in the content information stored in the management information storage unit  21 , in order to judge whether or not converted content Tb 1  and converted content Tb 3  can be moved to the counter direction (S 15 ). Besides, the judging unit  14  does not utilize head position pi 0  and end position po 0  for pre-converted content Ta 1  and head position pi 1  and end position po 1  for pre-converted content Ta 3  in order to judge whether or not the content can be moved to the counter direction. 
     When the judging unit  14  judges that all identifiers obtained by the medium identifier obtaining unit  20  and the content identifier obtaining unit  22  are not included in the content information (No in S 15 ), the content management device  1  notifies the judgment outward, and terminates the operation. 
     On the other hand, when the judging unit  14  judges that all identifiers obtained by the medium identifier obtaining unit  20  and the content identifier obtaining unit  22  are included in the content information stored in the management information storage unit  21  (Yes in S 15 ), the controlling unit  12  records the file management information FA in the content storage unit  13  again. The reproduction inactivating unit  19  activates pre-converted content Ta 1  and pre-converted content Ta 3 , which are a part of the first content  111 , stored in the content storage unit  13  in a status of reproduction being inactivated, using the file management information FA recorded again (S 16 ). For example, the reproduction inactivating unit  19  deletes the pointer stored in the content storage unit  13  or decrypts the encryption to restore pre-converted content Ta 1  and pre-converted content Ta 3 , and then the status of reproduction for the contents can be activated. At the same time the reproduction inactivating unit  19  deletes converted content Tb 1  and converted content Tb 3 , which are stored in the portable recording medium  2 . 
     The reproducing unit  23  reproduces the first content  111  by executing the reproduction of content T 0 , pre-converted content Ta 1 , content T 2  and pre-converted content Ta 3 , which are stored in the content storage unit  13 , in the sequence of content T 0 , pre-converted content Ta 1 , content T 2  and pre-converted content Ta 3  (S 16 ). 
     As additional matter, in the embodiment mentioned above, since the converting unit  15  converts pre-converted content Ta 1  and pre-converted content Ta 3  into such as deteriorated quality in video/audio, the reproduction inactivating unit  19  activates pre-converted content Ta 1  and pre-converted content Ta 3 , which are a part of the first content  111 , stored in a status of reproduction being inactivated in the content storage unit  13 . However the converting unit  15  does not need to convert. In that case when the judging unit  14  judges that all information obtained by the medium identifier obtaining unit  20  and the content identifier obtaining unit  22  are included in the content information stored in the management information storage unit  21 , the move processing unit  18  obtains converted content Tb 1  (the content is actually not converted) and converted content Tb 3  (the content is actually not converted) from the portable recording medium  2 . And then the reproducing unit  23  may reproduce the first content  111  by operating the reproduction of content T 0  and content T 2  stored in the content storage unit  13  and converted content Tb 1  and converted content Tb 3  obtained by the move processing unit  18  by reproducing in the sequence of content T 0 , converted content Tb 1 , content T 2  and converted content Tb 3 . 
     This method is effective in the following case. When the move processing unit  18  records converted content Tb 1  and converted content Tb 3  in the portable recording medium  2 , the reproduction inactivating unit  19  does not place pre-converted content Ta 1  and pre-converted content Ta 3  stored in the content storage unit  13  in a status of reproduction being inactivated subject to be able to activate the contents later, but the reproduction inactivating unit  19  deletes the contents and subsequently reproduces the first content  111 . 
     The reproduction inactivating unit  19  may delete the pre-converted content Ta 1  and pre-converted content Ta 3  stored in the content storage unit  13 , not placing the contents in a status of reproduction being inactivated. When the contents are deleted, the reproduction inactivating unit  19 , for example, may delete pre-converted content Ta 1  and pre-converted content Ta 3  by deleting the corresponding part to pre-converted content Ta 1  and pre-converted content Ta 3  in the file management information in the first content  111 . 
     The content information stored in the management information storage unit  21  may include information indicating which is the original content, pre-converted content Ta 1  and pre-converted content Ta 3  stored in the content storage unit  13  or converted content Tb 1  and converted content Tb 3  in the portable recording medium  2 . 
     Besides, in the first embodiment mentioned above, although the content storage unit  13  is exemplified as the first recording medium, the first recording medium is not required to be mounted in the content management device  1 , but the first recording medium may be an external recording medium of the content management device  1  like the portable recording medium  2 . When the first recording medium is DVD-R, as DVD-R is a write-once recording medium, the judging unit  14  judges that the first recording medium is not a medium in which the content can be moved. 
     When the reproducing unit  23  reproduces the first content  111 , the reproduction inactivating unit  19  may not delete converted content Tb 1  and converted content Tb 3  stored in the portable recording medium  2 , but may place the contents in a status of reproduction being inactivated. For example, the reproduction inactivating unit  19  moves the file management information for converted content Tb 1  and converted content Tb 3  to the area where a user is unable to access. Alternatively, the reproduction inactivating unit  19  encrypts converted content Tb 1  and converted content Tb 3 , accordingly the reproduction inactivating unit  19  may place converted content Tb 1  and converted content Tb 3  stored in the portable recording medium  2  in a status of reproduction being inactivated. 
     Additionally when the reproducing unit  23  reproduces the first content  111 , the controlling unit  12  may delete the content information to be stored in the management information storage unit  21 . 
     And also the converting unit  15  may newly convert into the part of the content by activating the content being inactivated for reproduction based on the instruction from outside such as user&#39;s instruction. Accordingly even if the user fails to encode content, the user is able to encode again. 
     Besides, although the move processing unit  18  is exemplified as an output unit, in the case where the portable recording medium  2  itself is a data recordable medium, the move processing unit  18  may be replaced as the output unit of the content. 
     The Second Embodiment 
     A content management device  100  in the second embodiment will be described using  FIG. 7 . 
       FIG. 7  is a block diagram illustrating a configuration for the content management device  100  in the second embodiment. The difference between the content management device  1  in the first embodiment and the content management device  100  in the second embodiment is, for example, that the content management device  100  includes a content combining unit  50 , which is not included in the content management device  1 . So only the different points from the content management device  1  for the content management device  100  will be described hereinafter. 
     (Moving a Part of a Content) 
     The content combining unit  50  generates stream T 02  by combining content T 0  and content T 2  stored in the content storage unit  13 , when the move processing unit  18  records converted content Tb 1  and converted content Tb 3  into the portable recording medium  2  as shown in  FIG. 8 . And also the content combining unit  50  generates pre-converted stream Ta 13  by combining pre-converted content Ta 1  and pre-converted content Ta 3 . And the content combining unit  50  records combined stream T 02  and pre-converted stream Ta 13  into the content storage unit  13 . At that time, the content combining unit  50  deletes the first content  111  that is the original stream. 
     The identifier generating unit  16  generates identifier “B” to be assigned to stream T 02  not to be moved, and generates identifier “C” to be assigned to pre-converted stream Ta 13  to be moved. When pre-converted stream Ta 13  is recorded in the portable recording medium  2 , the stream is recorded as converted stream Tb 13 . And then the identifier generating unit  16  generates identifier “D” assigned to converted stream Tb 13  after being moved. The identifier assigning unit  17  assigns identifier “B” to stream T 02 , identifier “C” to pre-converted stream Ta 13  and identifier “D” to converted stream Tb 13 . 
     The move processing unit  18  records converted stream Tb 13  in the portable recording medium  2 . At this time, the move processing unit  18  records identifier “D” for converted stream Tb 13  by putting in converted stream Tb 13  in the portable recording medium  2 . The move processing unit  18 , for example, records identifier “D” for converted stream Tb 13  in the user area in converted stream Tb 13 . 
     The reproduction inactivating unit  19  inactivates the reproduction of the generated pre-converted stream Ta 13 . The generated pre-converted stream Ta 13  is a stream combined pre-converted content Ta 1  and pre-converted content Ta 3 . 
     The controlling unit  12  records medium identifier α, which is the identifier related to the content storage unit  13 , by associating with identifier “B” of stream T 02  and identifier “C” of pre-converted stream Ta 13 , into the management information storage unit  21 . At that time, the controlling unit  12  records head position pi 0  and end position po 0  for pre-converted content Ta 1  and head position pi 1  and end position po 1  for pre-converted content Ta 3 , by associating with the medium identifier α and so on, into the management information storage unit  21 . And then the controlling unit  12  records the file management information for stream T 02  and pre-converted stream Ta 13  on the content storage unit  13 , by associating with medium identifier α and so on, into the management information storage unit  21 . 
     Additionally the controlling unit  12  records medium identifier β, which is the identifier related to the portable recording medium  2 , by associating with identifier “D” of converted stream Tb 13 , into the management information storage unit  21 . 
     The information stored in the management information storage unit  21  is “content information”. 
     (Moving to the Counter Direction and Reproducing) 
     The medium identifier obtaining unit  20  obtains an identifier of a recording medium. In fact the medium identifier obtaining unit  20  obtains medium identifier α, which is the identifier of the content storage unit  13 , and also obtains medium identifier β, which is the identifier of the portable recording medium  2 . 
     The content identifier obtaining unit  22  obtains identifier “B” of stream T 02  and identifier “C” of pre-converted stream Ta 13  from the content storage unit  13 . And also the content identifier obtaining unit  22  obtains identifier “D” of converted stream Tb 13  from the portable recording medium  2 . 
     The judging unit  14  judges whether or not all of the identifiers obtained by the medium identifier obtaining unit  20  and the content identifier obtaining unit  22  are included in the content information stored in the management information storage unit  21  so as to judge whether or not converted stream Tb 13  can be moved to the counter direction. 
     When the judging unit  14  judges that all of the identifiers obtained by the medium identifier obtaining unit  20  and the content identifier obtaining unit  22  are included in the content information, the reproduction inactivating unit  19  activates pre-converted stream Ta 13 , which is a part of the first content  111 , stored in the content storage unit  13  in a status of reproduction being inactivated. 
     And the reproducing unit  23  reproduces the first content  111  by reproducing and combining contents in the sequence of content T 0 , pre-converted content Ta 1 , content T 2  and pre-converted content Ta 3  based on the pointer on the original stream. 
     The Third Embodiment 
     A content management device  101  in the third embodiment will be described using  FIG. 9 . 
       FIG. 9  is a block diagram illustrating a configuration for the content management device  101  in the third embodiment. The difference between the content management device  1  in the first embodiment and the content management device  101  in the third embodiment is that the content management device  101  includes an encryption processing unit  51 , which is not included in the content management device  1 . So only the different points from the content management device  1  for the content management device  101  will be described hereinafter. 
     In the first embodiment, when the move processing unit  18  records converted content Tb 1  and converted content Tb 3  in the portable recording medium  2 , the controlling unit  12  records the content information in the management information storage unit  21 . 
     On the other hand, in the third embodiment, when the move processing unit  18  records converted content Tb 1  and converted content Tb 3  in the portable recording medium  2 , the encryption processing unit  51  encrypts the content information, and the controlling unit  12  records the content information encrypted by the encryption processing unit  51  in the management information storage unit  21 . At the time of counter-move processing, the encryption processing unit  51  decrypts the encrypted content information and renders the decrypted content information to the judging unit  14 . 
     The encryption processing unit  51  may encrypt a part of the content information, for example only the part for the file management information. 
     In the embodiment mentioned above, it is described about the case that the content management device  1  moves a part of the first content  111  to the portable recording medium  2 . The content management device  1  is also able to move the whole of the first content  111  to the portable recording medium  2 . In that case, as shown in  FIG. 10 , the content management device  1  assigns identifier “A” to the first content  111  and identifier “X” to the content to be recorded in the portable recording medium  2 . At the time of counter-move and reproduction processing, the content management device  1  reproduces the first content  111  or the content to be recorded in the portable recording medium  2 , like the case of reproducing pre-converted content Ta 1  or the corresponding converted content Tb 1  in  FIG. 3 . 
     Besides, the content management device  1 , as shown in  FIG. 11 , after the part of the first content  111  is moved to the portable recording medium  2 , the part of the content moved to the portable recording medium  2  can be further moved to the portable recording medium  200 . The content management device  1  reproduces the whole of contents when not only the identifiers of the two recording media but also the identifiers of the two contents are included in the content information stored in the management information storage unit  21 . Accordingly the content management device  1  manages not only the identifiers of the recording media but also the identifiers of the contents. 
     In the case where only identifiers of the recording media are managed, (1) if contents Ta 1  and Ta 3  assigned identifiers “C 1 ” and “C 3 ” occupy the most part of the first content  111 , and also (2) if content Tc 2 , assigned identifier “F” that is a part of contents Tb 1  and Tb 3  corresponding to contents Ta 1  and Ta 3 , occupies the most part of contents Tb 1  and Tb 3 , the following problem occurs. That is to say, if content Tc 1 , assigned identifier “E” that is the remaining contents Tb 1  and Tb 3  recorded in the portable recording medium  2 , is deleted, content Td, assigned identifier “G” corresponding to content Tc 2  assigned identifier “F” that occupies the most part of the first content  111 , can be duplicated to the portable recording medium  200 . In other words, content Td, assigned identifier “G” that occupies the most part of the first content  111 , can be duplicated to the portable recording medium  200 . However, as mentioned above, the content management device  1  manages not only identifiers of recording media but also identifiers of contents. As a result, the problem about duplication for content Td assigned identifier “G”, that occupies the most part of the first content  111 , does not happen. 
     INDUSTRIAL APPLICABILITY 
     The content management device in the present invention is practicable as an device for receiving a digital video/audio data with copyright protection such as digital television broadcasting signal, recording in the first recording medium such as HDD, inactivating the reproduction and outputting the data to the second recording medium and subsequently reproducing the data.