JP2010050839A - Data playback apparatus and data playback restriction system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrict playback of content data even if the content data are copied. <P>SOLUTION: A data playback restriction system 1 includes: data playback apparatuses 3a-3c each for reading and playing back content data 401, constituted of a plurality of interval data items, from Blu-ray disks 5a-5c storing thereon the interval data while rearranging the interval data in the order of viewing difficulty; and an administrative server 7 for transmitting to the apparatuses 3a-3c information required for playing back the content data 401. Each of the data playback apparatuses 3a-3c acquires from the Blu-ray disks 5a-5c encrypted order information representing a right playback order, a playlist 404 and an address table 405 and decrypts the order information using a decryption key acquired from the administrative server 7. Furthermore, on the basis of the decrypted order information, the playlist 404 and the address table 405, the interval data are played back in the right order. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technology for restricting viewing of content data stored in a storage medium, and particularly to a technology for restricting viewing of content data stored on a Blu-ray Disc.

  Conventionally, many techniques for restricting the viewing of video from the viewpoint of copyright protection and the like have been developed. For example, in order to make it impossible to read information when a certain period of time has elapsed after opening a DVD (Digital Versatile Disk) package, a technique (48DVD) for applying a special coating to the recording surface of a DVD or password There is a technology that permits DVD playback on the condition that is input.

  On the other hand, in recent years, Blu-ray discs are becoming popular as media having a larger capacity than DVD.

  However, even if the conventional technology for restricting viewing is applied to a medium such as a Blu-ray disc, content data (for example, a video stream file) stored in the medium is temporarily stored in a state where the medium can be played back. Once copied, there is a possibility that video can be reproduced without using viewing restrictions by using the copied content data.

  In view of the above problems, an object of the present invention is to provide a data reproduction device and a data reproduction restriction system that can restrict reproduction of content data even if the content data is copied.

  In order to achieve the above object, the data reproducing apparatus of the present invention provides the content data from a storage medium in which the section data is rearranged in an order different from the correct order for the content data composed of a plurality of section data. A sequence information acquisition means for acquiring the sequence information representing the correct sequence from the storage medium, from a portable storage medium, or from a sequence information distribution device via a communication line; Position definition acquisition means for acquiring position definition information for acquiring position information of the section data in content data from the storage medium, from a portable storage medium, or from a position definition distribution device via a communication line; Based on the acquired order information and the position definition information, the section in the content data according to the correct order. Acquiring position information of the data, on the basis of the acquired positional information, characterized by comprising, a means to acquire and reproduce the section data from the storage medium.

  In an embodiment of the present invention, the order information represents the correct order using the identification information of the section data, and the position definition information includes identification information, a reproduction start time, and a reproduction information for each section data. The playlist includes end times arranged in an order different from the correct order, and an address table representing addresses in the content data respectively corresponding to the playback start time and the playback end time, and the means for playing back Based on the identification information of the section data included in the acquired order information, the section data corresponding to the identification information corresponds to the address corresponding to the reproduction start time and the reproduction end time from the playlist and the address table. The address to be acquired is acquired as position information of the section data.

  Specifically, the order information acquisition unit may acquire the order information in an encrypted state. In this case, a key for decrypting the order information is obtained from a key management device via a communication line, and the order information obtained from the storage medium by the order information obtaining unit is decrypted using the obtained key. It is good to further have a means to do.

  Another data reproducing apparatus according to the present invention reads and reproduces the content data from a storage medium in which the section data is rearranged in an order different from the correct order for the content data composed of a plurality of section data. An apparatus for storing a play list file stored in an encrypted state in the storage medium and having a playback start time and a playback end time arranged in the correct order for each section data from the storage medium A list file acquisition unit, a unit for acquiring a clip info file representing an address in the content data corresponding to the playback start time and the playback end time from the storage medium, and a key for decrypting the playlist file. Acquired from the key management device via the communication line, the acquired playlist file A means for decoding, referring to the decoded playlist file and the clip info file, according to the correct order, obtaining an address corresponding to a reproduction start time and an address corresponding to a reproduction end time for each section data; Means for extracting and reproducing section data from the storage medium based on the acquired address.

  Another data reproducing apparatus of the present invention reads and reproduces the content data from a storage medium in which the interval data is rearranged in an order different from the correct order for content data composed of a plurality of interval data. A playlist file acquisition means for acquiring a playlist file in which the playback start time and playback end time are arranged in the correct order for each section data from a playlist file management device via a communication line; Means for obtaining a clip info file representing an address in the content data corresponding to the playback start time and the playback end time from the storage medium, and referring to the playlist file and the clip info file, and in the correct order. According to the above section data Retrieve the corresponding address to the address and playback end time corresponding to, on the basis of the obtained address, characterized in that it comprises a means for reproducing by extracting the section data from the storage medium.

  The data reproduction restriction system of the present invention is a data for reading out and reproducing the content data from a storage medium in which the section data is rearranged in an order different from the correct order for the content data composed of a plurality of section data. A data playback restriction system including a playback device and a management server that transmits information necessary for playback of the content data to the data playback device, wherein the data playback device is encrypted in the storage medium Order information acquisition means for acquiring the order information representing the correct order stored in the state from the storage medium, and a key for decrypting the order information from the management server via a communication line, and order information Means for decrypting the order information obtained by the obtaining means using the obtained key; Position definition acquisition means for acquiring position definition information for acquiring position information of the section data from the storage medium, from a portable storage medium, or from the management server via a communication line, and the decoded order information And means for acquiring position information of the section data in the content data according to the correct order based on the acquired position definition information, and acquiring and reproducing section data from the storage medium based on the acquired position information And the management server includes means for storing the key, and means for transmitting the key as the necessary information to the data reproduction apparatus in response to a request from the data reproduction apparatus. It is characterized by that.

  Another data reproduction restriction system according to the present invention reads out and reproduces the content data from a storage medium in which the section data is rearranged in an order different from the correct order for the content data composed of a plurality of section data. A data playback restriction system including a data playback device that performs a management server that transmits information necessary for playing back the content data to the data playback device, wherein the data playback device represents the correct order. Order information acquisition means for acquiring information from the management server via a communication line, and position definition information for acquiring position information of the section data in the content data from the storage medium to a portable storage medium Or a location definition acquisition means for acquiring from the management server via a communication line, and the acquisition Means for acquiring position information of the section data in the content data according to the correct order based on the order information and the position definition information, and acquiring and reproducing the section data from the storage medium based on the acquired position information; The management server includes means for storing the order information, and means for transmitting the order information as the necessary information to the data reproduction apparatus in response to a request from the data reproduction apparatus. It is characterized by that.

  In the present invention, the term “means” does not simply mean a physical means, but includes a case where the functions of the means are realized by software. Further, the function of one means or device (including a server) may be realized by two or more physical means or devices, or the function of two or more means or devices is one physical means or device. May be realized.

  According to the present invention, with respect to content data composed of a plurality of section data, the contents data is read from a storage medium in which the section data is rearranged in an order different from the correct order and stored and reproduced. Even if the content data is copied, it is possible to provide a framework in which normal reproduction of the data is restricted. Specifically, when the content data is reproduced as it is, the content data is reproduced in an order different from the correct order, so that the person who copied the content data cannot understand the contents and substantially restricts viewing. Is possible.

  Such an effect is that information (order information and part or all of position definition information) necessary for reproduction of content data is not stored in the storage medium, and these information are stored in a portable storage medium different from the storage medium. Further, it is further enhanced by adopting a configuration in which data is acquired from a device (for example, a management server) different from the data reproducing device via a communication line. Alternatively, the information necessary for the reproduction is encrypted, and a key for decrypting the information is used as information necessary for the reproduction of data as a device different from the data reproduction device via the communication line (for example, By adopting a configuration acquired from the management server), a greater effect can be obtained.

  Hereinafter, embodiments of the data reproduction restriction system 1 and the data reproduction apparatuses 3a to 3c according to the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration of a data reproduction restriction system 1 according to the present invention.

  The data reproduction restriction system 1 controls whether or not the content data stored in the Blu-ray discs 5a to 5c is correctly reproduced (reproduced so as to be understood by the user) on the data reproduction devices 3a to 3c. In the present embodiment, the content data is composed of a plurality of section data arranged in an order different from the correct order.

  In order to realize such control, the system 1 includes a plurality of data reproducing devices 3a to 3c and a management server 7 that are communicably connected via a communication line. For example, the Internet can be considered as the communication line. In the figure, three data reproducing apparatuses 3a to 3c are shown, but any number of data reproducing apparatuses 3a to 3c may be used as long as it is one or more.

  Also, the correct order is the normal playback order that allows viewers to understand the content of the content (the playback order intended by the content creator), and the order different from the correct order is any other order, For example, a playback order in which the viewer cannot understand the content is considered, such as a random playback order. Hereinafter, an order different from the correct order is referred to as “difficult viewing order”.

  As the content data, a video stream file related to a video with sound such as a movie, animation, theater, or concert, or an audio stream file related to sound such as music or a seminar can be considered.

  Each of the data reproducing devices 3a to 3c has a function of reading and reproducing the content data stored in the Blu-ray discs 5a to 5c. Further, it has a function of requesting the management server 7 to transmit information necessary for reproducing content data and acquiring the information from the management server 7.

  The management server 7 has a function of transmitting information necessary for reproducing content data in response to requests from the data reproducing devices 3a to 3c. In this embodiment, the management server 7 can confirm that the request is from a legitimate device when there is a request for information necessary for the playback from the data playback devices 3a to 3c (authentication is successful). This information is transmitted to the requesting data reproducing apparatus. Information processing related to the determination will be described later with reference to FIG. For example, a valid device may be a device owned by a person who has purchased or rented the Blu-ray Disc 5a or a device owned by a person who has registered as a regular user.

  FIG. 2 shows a hardware configuration of the data reproducing apparatuses 3a to 3c.

  The data reproducing devices 3a to 3c are a central processing unit (CPU) 201, a RAM 202, a ROM 203, a hard disk drive (HDD) 204, a display unit 205, an input unit 206, a communication unit 207, an output unit 208, a media IF 209, and these. It is configured using a bus connected to

  The ROM 202 stores information such as a program that defines the operation mode of the data reproducing devices 3a to 3c.

  The HDD 204 stores information such as content data that is permitted to be copied from the Blu-ray discs 5a to 5c in accordance with a user instruction.

  The display unit 205 displays various information related to the content data being played back (for example, movie title, playback time, remaining time, etc.), information related to the operation method of the data playback devices 3a to 3c, and the like.

  As the input unit 206, a button for accepting a manual operation from a user and an interface (such as an infrared receiving device) for accepting a remote control operation are conceivable.

  The communication unit 207 is a device (such as a LAN adapter or a wireless LAN card) for connecting the data reproducing devices 3a to 3c to a communication line so that wireless communication or wired communication is possible.

  The output unit 208 is a device (for example, an output terminal) that outputs video data, audio data, and the like of content data being reproduced. For example, by connecting a cable between the output unit 208 and an input terminal of a monitor (for example, a television), the user can display and view the video reproduced by the data reproducing devices 3a to 3c on the monitor. The data reproducing devices 3a to 3c may include a monitor and a speaker as the output unit 208.

  The media IF 209 is an interface for reading and writing data with the Blu-ray discs 5a to 5c. In this embodiment, a Blu-ray disc drive is used as the media IF 209.

  The management server 7 is realized by a general information processing apparatus including a CPU, RAM, ROM, HDD, display, input unit (for example, keyboard and mouse), and communication unit (for example, LAN adapter). Here, illustration of the hardware configuration of the management server 7 is omitted.

  FIG. 3 shows a configuration of the data reproducing device 3a.

  Since the data reproducing apparatuses 3a to 3c have the same configuration, only the data reproducing apparatus 3a will be described here.

  In order to read and reproduce the content data from the Blu-ray Disc 5a in which the section data is rearranged in the hard-to-view order for the content data composed of a plurality of section data, the data playback device 3a in the present embodiment, for example, The CPU 201 executes various programs that are functionally realized by executing predetermined programs recorded in the ROM 203 or the HDD 202.

Specifically, the data reproducing device 3a
Order information acquisition means 301 for acquiring from the Blu-ray disc 5a order information stored in the Blu-ray disc 5a in an encrypted state and representing the correct order using the identification information of the section data;
Position definition acquisition means 302 for acquiring, from the Blu-ray disc 5a, position definition information for acquiring position information of the section data in the content data based on the identification information of the section data;
In order to make the management server 7 determine that the data reproducing apparatus 3a is a legitimate apparatus (to make the authentication successful), for example, the identification information of the data reproducing apparatus 3a, the identification information of the Blu-ray disc 5a, and the reproduction Authentication request means 303 for transmitting identification information of target content data (hereinafter collectively referred to as “authentication request information”) to the management server 7 and receiving an authentication result from the management server 7;
When authentication is successful, a key for decrypting the order information is obtained from the management server 7 via the communication line, and the order information obtained by the order information obtaining unit 301 is decrypted using the key ( Decryption means) 304;
Based on the decoded order information and the acquired position definition information, the position information of the section data in the content data is acquired in the correct order, and the section data is acquired from the Blu-ray disc 5a based on the acquired position information and reproduced. Means (reproducing means) 305,
Is provided.

  The specific contents of the information processing by each means will be described later with reference to FIG. In addition, each of the above means may be realized by providing a processing device (hardware different from the CPU 201) having a part or all of those functions.

  In the present embodiment, the authentication request information includes, for example, a playback device ID that represents identification information of the data playback device 3a, a disc ID that represents identification information of the Blu-ray disc 5a, and a title ID that represents the identification information of content data. . The playback device ID can be recorded in a ROM, for example.

  The contents data, order information, and position definition information handled in the data reproduction restriction system 1 will be described later with reference to FIGS.

  FIG. 4 shows the configuration of the Blu-ray disc 5a.

  Since all the configurations of the Blu-ray discs 5a to 5c are common, the Blu-ray disc 5a will be described here.

  The Blu-ray disc 5a in this embodiment stores content data 401, order information 402, position definition information 403, disc ID 406, and title ID 407.

In the present embodiment, the position definition information 403 is
A playlist 404 representing the difficult viewing order of the section data using the identification information, playback start time, and playback end time for each section data constituting the content data 401;
An address table 405 representing addresses in the content data corresponding to the reproduction start time and the reproduction end time;
It is comprised including.

  Here, in the Blu-ray Disc standard, a playlist is sometimes called a playlist file and an address table is sometimes called a clip info file.

  The disc ID 406 is identification information of the Blu-ray disc 5a, and the title ID 407 is identification information of the content data 401 stored in the Blu-ray disc 5a.

  When multiple types of content data are stored in the Blu-ray disc 5A, the title ID 407 is stored one by one corresponding to each content data so that each content data can be identified. For example, each title ID can be associated with each content data by being stored in the corresponding content data directory. Or it can also be matched with each content data by giving as header information of each content data.

  FIG. 5 shows the data structure of the content data 401.

  In the present embodiment, the content data 401 includes a plurality of section data having different identification information (for example, “0x00001”, etc.) as shown in the figure. Then, the content data 401 sets the section data in a difficult viewing order (eg, “vadndje, cdtsane, fdaeioe,...”) Different from the correct order (eg, “fdksfda, reqgadd, fdaeioe,...”). They are stored in the Blu-ray disc 5a in the rearranged state.

  The plurality of section data are separated by a predetermined length (for example, a data length corresponding to one minute). The length of each section data may be the same or different. In addition, although seven section data are shown in the figure, it may of course be divided into a number other than seven.

  FIG. 6 shows the data structure of the order information 402.

  The order information 402 associates identification information (section ID) of section data with information (for example, video scale) indicating the length of each section data, and stores these pieces of information in a correct order. . The section ID is composed of an arbitrary character string that can uniquely identify each section data. In this embodiment, the video scale of each section data is set to 1 minute as shown in the figure. The order information 402 is stored in the Blu-ray discs 5a to 5c in an encrypted state.

  Here, information corresponding to the order information 402 is not stored in a general Blu-ray disc. Content data stored in a general Blu-ray disc is configured in a state where section data is arranged in the correct order in the first place, and a playlist is also configured to indicate the correct order. This is because information for acquiring the correct order of the section data is unnecessary.

  FIG. 7 shows the data structure of each of (A) a playlist 404 representing the difficult viewing order, (B) an address table 405, and (C) a playlist 406 representing the correct order.

  The playlist 404 in (A) includes a section ID of each section data, a start time (start point) in the content data 401 of each section data, and an end time (end point) in the content data 401 of each section data. Are stored in a state in which these pieces of information are arranged in the current section data order (difficult viewing order).

  The address table 405 in (B) stores addresses in the content data 401. The address stored in the address table 405 includes an address in the content data 401 corresponding to the start point of each section data and an address in the content data 401 corresponding to the end point of each section data. As an address managed by the address table 405, a relative address based on the head position of the content data 401 can be considered.

  Here, a general Blu-ray Disc playback device acquires the address of the section data to be played back from the address table according to the order defined in the playlist stored on the Blu-ray disc, and from the Blu-ray disc based on the address Read data and play it back.

  Therefore, when the content data 401 (FIG. 5) in the Blu-ray disc 5a is reproduced as it is using such a general reproduction device, the content data 401 is reproduced in the order defined in the playlist 404 (difficult viewing order). Will be. Therefore, the viewer cannot understand the contents of the content being reproduced. Thereby, even when the content data 401 is copied from the Blu-ray disc 5a to another storage medium, it is possible to prevent a situation where the content data 401 is viewed illegally.

  The playlist 406 indicating the correct order of (C) includes a section ID of each section data, a start time (start point) in the contents data 401 of each section data, and an end time (start point) in the contents data 401 of each section data ( End point) and store these pieces of information in the correct order.

  The playlist 406 representing the correct order arranges the data rows stored in the playlist 404 representing the difficult viewing order in (A) in accordance with the correct order of the section data defined in the order information 402 (FIG. 6). It is obtained by changing.

  In the present embodiment, the playback unit 305 of the data playback device 3a does not create the playlist 406 of (C) above when playing back the content data 401, but the sequence information 402 and the playlist 404 of (A) above. By referring to the position information (address) of the corresponding section data while sequentially determining the correct order of the section data as shown in the playlist 406, the start point of the section data, and the end point of the section data. ) Is acquired from the address table 405 of (B), and section data is acquired from the Blu-ray disc 5a based on this position information and reproduced. Note that when the content data 401 is reproduced, the playlist 406 (C) may be created in advance.

  FIG. 8 shows the configuration of the management server 7.

The management server 7 transmits information necessary for reproducing the content data 401 (in this embodiment, a key [decryption key] for decrypting the order information 402) to the data reproducing devices 3a to 3c. As a means functionally realized by the CPU executing a predetermined program recorded in the ROM or HDD,
An authentication processing unit 801 for determining whether or not the data reproducing devices 3a to 3c that are transmission sources of the information are legitimate devices (whether authentication is successful) when the authentication request information is received via the communication line; ,
In response to a request from the data reproducing apparatuses 3a to 3c, a decryption key transmitting unit 802 that transmits a decryption key to the requesting data reproducing apparatuses 3a to 3c on the condition that the authentication of the apparatus is successful. ,
Is provided.

  Specific contents of the information processing by these means will be described later with reference to FIG.

In addition, the management server 7 is a database that stores various types of information used for information processing by the above means.
An authentication information DB for storing information necessary for authentication of the data reproducing devices 3a to 3c;
Means (key information DB) for storing a key for decrypting the order information 402;
Is provided.

  The key information DB may be a database that stores the title ID of the content data 401 and the decryption key of the order information 402 of the content data 401 in association with each other. The data structure of the authentication information DB will be described later with reference to FIG. These DBs are stored in the HDD of the management server 7, for example.

  FIG. 9 shows the data structure of the authentication information DB.

  The authentication information DB stores a reproduction device ID, a disc ID, and a title ID in association with each other as information (authentication information) corresponding to authentication request information transmitted from each data reproduction device 3a to 3c to the management server 7. To do.

  In the authentication information DB, for example, when a user who owns the data reproducing device 3a purchases a Blu-ray disc 5a at a store, the reproducing device ID of the device 3a, the disc ID 406 of the disc 5a, and the disc 5a Is stored as authentication information in association with the title ID 407 of the content stored in the.

  In this embodiment, since authentication information is stored in the authentication information DB, although not shown in FIG. 1, a computer installed in a store and the management server 7 are connected via a communication line. To do. For example, store staff obtains a playback device ID from a user who purchases a Blu-ray disc (obtains by listening or by reading an IC card storing the ID) and inputs it to a computer installed in the store To do. The input playback device ID is transmitted to the management server 7 together with the disc ID of the Blu-ray disc to be purchased and the title ID of the content stored on the disc, and stored in the authentication information DB. The same configuration can be used when a Blu-ray disc is rented by a user.

  As another example, for example, a user ID may be obtained from a Blu-ray Disc purchaser or a lessee (obtained by listening or by reading an IC card storing the ID). In this case, a computer or management server installed in the store holds a database in which the user ID is associated with the playback device ID of the data playback device owned by each user. When the user ID is input, the store computer or the management server can obtain the playback device ID corresponding to the disc purchaser or the renter by referring to the database. Also in this case, the playback device ID, the disc ID, and the title ID are stored in the authentication information DB in the same manner as described above.

  FIG. 10 is a flowchart showing a flow of information processing by the data reproducing device 3a and the management server 7. The flow of information processing will be described below with reference to this figure.

  When the Blu-ray disc 5a is inserted into the Blu-ray disc drive 209, the authentication requesting means 303 of the data reproducing device 3a detects that (ST101) and acquires the disc ID 406 and title ID 407 from the Blu-ray disc 5a.

  Here, when a plurality of types of content data are stored in the Blu-ray disc 5a, the authentication request unit 303 identifies content data to be played back in response to a content data selection operation by the user, and the content The title ID corresponding to the data can be acquired.

  Next, the authentication request unit 303 acquires the playback device ID from the ROM of the data playback device 3a (ST103), and transmits it to the management server 7 as authentication request information together with the disc ID 406 and title ID 407 acquired from the Blu-ray disc 5a. (ST104).

  When receiving the authentication request information from the data reproducing device 3a (ST105), the authentication processing means 801 of the management server 7 refers to the authentication information DB, compares the received authentication request information with the data in the authentication information DB, and performs authentication. It is determined whether the request information is included in the authentication information DB (whether authentication is successful) (ST106). Upon completion of such authentication processing, authentication processing section 801 transmits information relating to the result of authentication (authentication result information) to data reproduction device 3a that is the transmission source of authentication request information (ST107).

  Upon receiving the authentication result information from the management server 7 (ST108), the authentication requesting unit 303 of the data reproducing device 3a, when the authentication result information indicates a positive content (successful authentication), the decrypting unit 304 To that effect. On the other hand, if the authentication result information indicates negative contents (authentication failure), the content data 401 cannot be reproduced by a method such as displaying the fact on the display unit 205 of the data reproducing apparatus 3a. It is possible to present this to the user.

  When receiving the notification regarding the positive authentication result information from the authentication requesting unit 303, the decrypting unit 304 of the data reproducing device 3a requests the management server 7 to transmit a decryption key for decrypting the order information 402 ( ST109). In the case of such a request, for example, a title ID 407 related to the content data 401 to be reproduced is also transmitted.

  When receiving the request from the data reproducing device 3a (ST107), the decryption key transmitting means 802 of the management server 7 receives the request along with the request on the condition that the data reproducing device 3a as the request source has been successfully authenticated. Based on the title ID 407, a decryption key corresponding to the title ID 407 is acquired from the key information DB (ST111). The decryption key transmission means 802 transmits the decryption key acquired from the key information DB to the data reproducing device 3a that is the request source (ST112).

  When receiving the decryption key from the management server 7 (ST113), the decryption means 304 of the data reproduction apparatus 3a notifies the order information acquisition means 301 and the position definition acquisition means 302 to that effect.

  In response to this notification, the order information acquisition unit 301 acquires the order information 402 from the Blu-ray disc 5a, and the position definition acquisition unit 302 acquires the position definition information 403 from the Blu-ray disc 5a (ST114).

  The decryption means 304 of the data reproduction device 3a decrypts the order information acquired by the order information acquisition means 301 using the decryption key acquired from the management server 7 (ST115).

  Then, the reproducing unit 305 of the data reproducing apparatus 3a acquires the position information of the section data in the content data 401 according to the correct order based on the order information decoded by the decoding unit 304 and the position definition information acquired by the position definition acquiring unit 302. Then, based on the acquired position information, section data is acquired from the Blu-ray disc 5a and reproduced (ST117), and the processes of ST116 and ST117 are repeated until the reproduction of all the section data is completed.

  Specifically, the playback unit 305 sequentially acquires identification information of section data described in the correct order included in the decoded order information, and based on the acquired order information, the play unit 305 includes the play information included in the position definition information 403. For the section data corresponding to the identification information, the address in the content data 401 corresponding to the start point and the address in the content data 401 corresponding to the end point are acquired as position information of the section data from the list 404 and the address table 405. To do. Then, by accessing the Blu-ray disc 5a and reading the section data existing in the storage area from the address in the content data 401 corresponding to the start point to the address in the content data 401 corresponding to the end point, one section Play the data.

  When the reproduction of one section data is completed, the reproduction unit 305 determines whether the reproduction of the content data 401 is completed, that is, whether all the section data constituting the content data 401 to be reproduced has been reproduced (ST118). ).

  As a result of the determination, if the reproduction has not ended (if the determination is “No”), the reproduction means 305 proceeds to the process of ST116 and reproduces the next section data (ST116, ST117).

  On the other hand, as a result of the determination, when the reproduction is completed (when the determination is “Yes”), the reproduction unit 305 terminates the process.

  According to the data reproduction apparatuses 3a to 3c and the data reproduction restriction system 1 of the present invention, it is possible to provide a framework for restricting normal reproduction of the content data 401 stored in the Blu-ray discs 5a to 5c. Specifically, since a general Blu-ray disc playback apparatus can only play back content data according to a playlist, for example, the playlist 404 is difficult to view like the playlist 404 stored in the Blu-ray disc 5a. If the order is expressed, the section data cannot be reproduced in the correct order. Further, since the content data 401 (FIG. 5) stored in the Blu-ray disc 5a is in a state in which the section data is rearranged in the difficult viewing order, the content data 401 is normal even if the content data 401 is copied. Playback can be restricted.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to said embodiment, In the range which does not change the summary of invention, an appropriate change is possible. Hereinafter, modifications of the present invention will be described.
[Modification]
FIG. 11 shows the configuration of the management server 7 in a modification of the data reproduction restriction system of the present invention.

  (A) shows that the order information 402 (FIG. 4) is not stored in the Blu-ray discs 5 a to 5 c, and the management server 7 when the data reproducing devices 3 a to c acquire the order information 402 from the management server 7. The structure of is shown.

  In this case, the management server 7 stores the order information DB that stores the title ID and the order information 402 in association with each other, and the content to be played back in response to a request from the data playback devices 3a to 3c that have been successfully authenticated. Order information transmitting means 803 for extracting the order information 402 corresponding to the data from the order information DB and transmitting it to the requesting data reproducing devices 3a to 3c. In this case, the data reproduction apparatuses 3 a to 3 c can be configured such that the order information acquisition unit 301 requests the management server 7 to transmit the order information 402. When the order information 402 acquired from the management server 7 is not encrypted, the data reproducing devices 3a to 3c may not include the decrypting unit 304.

  (B) is stored in the Blu-ray disc in a state where each section data constituting the content data 401 is encrypted, and the data reproducing devices 3a to 3c obtain the decryption key of the section data and the order information 402. A configuration of the management server 7 in the case of obtaining from the management server 7 is shown. Even in this case, it is assumed that the order information 402 is not stored in the Blu-ray discs 5a to 5c.

  In such a case, the decryption key transmission / reception process performed between the data reproducing devices 3a to 3c and the management server 7 is the same as the decryption key transmission / reception process of the sequence information 402 in the above-described embodiment. In addition, the transmission / reception processing of the order information 402 performed between the data reproducing devices 3a to 3c and the management server 7 is the same as the processing in the example (A). When playing back the encrypted section data, the playback unit 305 may sequentially decrypt and play back the section data every time the section data is acquired from the Blu-ray disc 5a, or the content to be played back. It is also possible to decode all the section data constituting the data 401 together, store the decoded section data once in the RAM or HDD, and reproduce the stored section data.

  (C) shows the configuration of the management server 7 when the data reproducing devices 3a to 3c acquire a playlist representing the correct order from the management server 7. In this case, it is assumed that the playlist 404 (FIG. 4, FIG. 7A) indicating the difficult viewing order and the order information 402 are not stored in the Blu-ray discs 5a to 5c.

  In the above case, the management server 7 displays the playlist 406 (FIG. 7C) in the correct order corresponding to each content data 401 stored in the Blu-ray discs 5a to 5c (for example, corresponding to the title ID). In response to a request from the playlist DB to be stored and the data playback devices 3a to 3c, the playlist 406 corresponding to the content data 401 to be played back is extracted from the playlist DB, and the request source data playback devices 3a to 3c are extracted. And playlist transmission means 804 for transmitting to.

  In this case, in the data reproducing devices 3a to 3c, for example, the reproducing unit 305 can be configured to request the management server 7 to transmit the playlist 406. Further, the order information acquisition unit 301 and the decoding unit 304 may not be provided. The reproduction means 305 of the data reproduction apparatuses 3a to 3c is based on the playlist 406 acquired from the management server 7 and the address table 405 acquired by the position definition acquisition means 302 from the Blu-ray disks 5a to 5c. The section data is acquired from c and reproduced.

  Unlike the above-described embodiment, the playlist 406 (FIG. 7C) indicating the correct order is stored in the Blu-ray Disc 5a in an encrypted state instead of the playlist 404 indicating the difficult viewing order. May be. In this case, the decryption key of the playlist 406 is stored in the key information DB of the management server 7. The decryption means 304 of the data reproducing device 3a requests the management server 7 to transmit the decryption key of the playlist 406, and decrypts the playlist 406 using the composite key received from the management server 7. In this case, it is assumed that the order information 402 is not stored in the Blu-ray discs 5a to 5c. Further, the playlist 406 may not store the section ID.

  In the above embodiment, the video scale of each section data is all 1 minute as shown in FIG. 6, but it may be longer or shorter than this, and further, it differs for each section data. It may be.

  In the above-described embodiment and each modification, each unit included in the data reproducing device 3a may be configured as one or a plurality of units or may be further subdivided. The same applies to each means of the management server 7. For example, the position definition acquisition unit 302 of the data reproducing device 3a (FIG. 3) is configured by dividing it into a playlist acquisition unit that acquires the playlist 404 from the Blu-ray disc 5a and an address table acquisition unit that acquires the address table 405. It may be.

  In the above embodiment and each modification, the management server 7 has a key management function for transmitting a decryption key, an order information distribution function for transmitting order information, and position definition information (one or both of a playlist and an address table). Is configured as a single device having a part or all of the location definition distribution function for transmitting, but it is sufficient to have these functions as a whole, and a plurality of management servers 7 distributed on a communication line are sufficient. You may comprise by an apparatus.

  In the above-described embodiment and modification, the order information is acquired from the Blu-ray discs 5a to 5c or from the management server 7. However, the order information may be a CD-ROM or a flash memory. You may acquire from a portable storage medium.

  In the above-described embodiment and modification, the position definition information is acquired from the Blu-ray discs 5a to 5c, or the playlist of the position definition information is acquired from the management server 7. The position definition information (one or both of the playlist and the address table) may be acquired from the management server 7 or a portable storage medium such as a CD-ROM or a flash memory.

  In this modified example, the management server 7 may hold a playlist 406 indicating the correct order, and the data reproducing devices 3a to 3c may be provided with means for acquiring the playlist 406 from the management server 7. It is assumed that the order information 402 and the position definition information 403 are not stored in the Blu-ray discs 5a to 5c, and the data reproducing apparatuses 3a to 3c do not include the order information acquisition unit 301.

  In the above-described embodiment, the order information 402 is stored in the Blu-ray disc 5a in an encrypted state, but it may not be encrypted. In this case, since it is not necessary to acquire the decryption key of the order information 402 from the management server 7, a framework that the present invention intends to provide with the data reproducing devices 3a to 3c (a framework for restricting normal reproduction of content data) Can be realized.

  The data reproducing devices 3a to 3c are a plurality of external devices (for example, a device having a key management function, a device having an order information distribution function, a device having a position definition distribution function, etc.) via the communication line. ) May be provided with a function for centrally managing (relaying) access to these external devices and responses from the access destination. Such a function can be realized using software or / and hardware using conventional techniques related to a proxy server or the like.

The figure which shows the structure of the data reproduction | regeneration restriction | limiting system of embodiment. The figure which shows the hardware constitutions of a data reproduction apparatus. The figure which shows the structure of a data reproduction apparatus. The figure which shows the structure of a Blu-ray Disc. The figure which shows the data structure of content data. The figure which shows the data structure of order information. The figure which shows each data structure of (A) playlist showing difficult viewing order, (B) address table, and (C) playlist showing correct order. The figure which shows the structure of a management server. The figure which shows the data structure of authentication information DB. The flowchart showing the flow of the information processing by a data reproduction apparatus and a management server. The figure which shows the structure of the management server in the modification of the data reproduction | regeneration restriction | limiting system of this invention.

Explanation of symbols

1 Data Reproduction Restriction System 3a-c Data Reproduction Device 5a-c Blu-ray Disc 7 Management Server 201 CPU
202 RAM
203 ROM
204 HDD
205 Display Unit 206 Input Unit 207 Communication Unit 208 Output Unit 209 Media IF
301 Order information acquisition means 302 Position definition acquisition means 303 Authentication request means 304 Decoding means 305 Playback means 401 Content data 402 Order information 403 Position definition information 404 Playlist 405 Address table 406 Playlist 801 indicating correct order Authentication processing means 802 Decryption key Transmission means 803 Order information transmission means 804 Playlist transmission means

Claims (7)

A data playback device that reads and plays back the content data from a storage medium in which the section data is rearranged in an order different from the correct order for content data composed of a plurality of section data,
Order information acquisition means for acquiring order information representing the correct order from the storage medium, from a portable storage medium, or from an order information distribution device via a communication line;
Position definition acquisition means for acquiring position definition information for acquiring position information of the section data in the content data from the storage medium, from a portable storage medium, or from a position definition distribution device via a communication line; ,
Based on the acquired order information and position definition information, the position information of the section data in the content data is acquired according to the correct order, and the section data is acquired from the storage medium and reproduced based on the acquired position information. Means to
A data reproducing apparatus comprising: The order information represents the correct order using the identification information of the section data,
The position definition information corresponds to the playlist in which the identification information, the reproduction start time, and the reproduction end time are arranged in an order different from the correct order, and the reproduction start time and the reproduction end time for each section data. And an address table that represents an address in the content data,
The means for reproducing is based on the identification information of the section data included in the acquired order information, and from the playlist and the address table, for the section data corresponding to the identification information, an address corresponding to the reproduction start time and An address corresponding to the playback end time is acquired as position information of the section data.
The data reproducing apparatus according to claim 1. The order information acquisition means acquires the order information in an encrypted state,
Means for obtaining a key for decrypting the order information from a key management device via a communication line, and decrypting the order information obtained by the order information obtaining means from the storage medium using the obtained key; In addition,
The data reproducing apparatus according to claim 1 or 2. A data playback device that reads and plays back the content data from a storage medium in which the section data is rearranged in an order different from the correct order for content data composed of a plurality of section data,
Playlist file acquisition means for acquiring, from the storage medium, a playlist file that is stored in an encrypted state in the storage medium and in which the playback start time and the playback end time are arranged in the correct order for each section data; ,
Means for acquiring a clip info file representing an address in the content data corresponding to the playback start time and the playback end time from the storage medium;
Means for acquiring a key for decrypting the playlist file from a key management device via a communication line, and decrypting the acquired playlist file;
With reference to the decrypted playlist file and the clip info file, the address corresponding to the playback start time and the address corresponding to the playback end time are acquired for each of the section data according to the correct order, and based on the acquired address Means for extracting and reproducing section data from the storage medium;
A data reproducing apparatus comprising: A data playback device that reads and plays back the content data from a storage medium in which the section data is rearranged in an order different from the correct order for content data composed of a plurality of section data,
Playlist file acquisition means for acquiring a playlist file in which the playback start time and playback end time are arranged in the correct order for each section data from the playlist file management device via a communication line;
Means for acquiring a clip info file representing an address in the content data corresponding to the playback start time and the playback end time from the storage medium;
With reference to the playlist file and the clip info file, according to the correct order, obtain an address corresponding to the reproduction start time and an address corresponding to the reproduction end time for each section data, and based on the obtained address, Means for extracting and reproducing section data from a storage medium;
A data reproducing apparatus comprising: For content data composed of a plurality of section data, a data playback apparatus that reads and plays back the content data from a storage medium in which the section data is rearranged in an order different from the correct order, and the data playback apparatus A data reproduction restriction system including a management server that transmits information necessary for reproduction of the content data.
The data reproduction device includes:
Order information acquisition means for acquiring order information stored in the storage medium in an encrypted state and representing the correct order from the storage medium;
Means for obtaining a key for decrypting the order information from the management server via a communication line, and decrypting the order information obtained by the order information obtaining means using the obtained key;
Position definition acquisition means for acquiring position definition information for acquiring position information of the section data in the content data from the storage medium, from a portable storage medium, or from the management server via a communication line;
Based on the decoded order information and the acquired position definition information, the position information of the section data in the content data is acquired according to the correct order, and the section data is acquired from the storage medium based on the acquired position information. And means to play,
With
The management server
Means for storing the key;
Means for transmitting the key as the necessary information to the data reproducing device in response to a request from the data reproducing device;
Comprising
A data reproduction restriction system characterized by that. For content data composed of a plurality of section data, a data playback apparatus that reads and plays back the content data from a storage medium in which the section data is rearranged in an order different from the correct order, and the data playback apparatus A data reproduction restriction system including a management server that transmits information necessary for reproduction of the content data.
The data reproduction device includes:
Order information acquisition means for acquiring order information representing the correct order from the management server via a communication line;
Position definition acquisition means for acquiring position definition information for acquiring position information of the section data in the content data from the storage medium, from a portable storage medium, or from the management server via a communication line;
Based on the acquired order information and position definition information, the position information of the section data in the content data is acquired according to the correct order, and the section data is acquired from the storage medium and reproduced based on the acquired position information. Means to
With
The management server
Means for storing the order information;
Means for transmitting the sequence information as the necessary information to the data reproduction device in response to a request from the data reproduction device;
Comprising
A data reproduction restriction system characterized by that.

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