JP6113508B2 - Recording method and electronic device - Google Patents

Description

  The present invention relates to a recording method and an electronic apparatus.

  In electronic devices such as recorder devices and television receivers, content providers (including programs provided as broadcasts) require content providers (distribution sources), broadcast stations, etc. to comply with operational regulations.

JP 2006-41582 A

  Content protection methods include a device binding method that can be used (reproduced and dubbed) only by a recorded device, a media binding method that uses a mechanism for safe storage in a recording medium (media), and the like.

  For the broadcast content, a duplication enabling condition called “dubbing 10” or “copy once” is prepared.

  When “dubbing 10” content is recorded by the device binding method, the recorded content can only be played back by the recording device, but it is allowed to be moved after being copied to a Blu-ray disc or DVD nine times.

  On the other hand, when “Dubbing 10” content is recorded by the media binding method, it can be played back by a device that supports the media binding method, but it cannot be recorded as dubbing 10 due to ARIB restrictions, and copy once. It must be recorded as content (not copyable, only moveable).

  An object of the present invention is to provide a recording method and an electronic device that take advantage of both the device binding method and the media binding method.

According to the embodiment, the electronic device includes a first recording means, and a second serial Rokute stage, Ru comprising a. First recording means, in accordance with the first protection scheme of the device binding method to generate a first cipher or this pentene tool encrypts content, is recorded in the recording apparatus. Second serial Rokute stage, before Symbol first encrypted content recorded in the recording apparatus, the second encrypted content encrypted in accordance with the second protection method of media binding method is performed Is recorded on the recording device. The second recording means generates the second encrypted content by reducing the number of copies of the first encrypted content. The second encrypted content is associated with a UsageRule that cannot be copied and can be moved once .

An example of the electronic device to which the embodiment is applied is shown. An example of the recording structure of the content recording method to which the embodiment is applied is shown. An example of the recording structure of the content recording method to which the embodiment is applied is shown. An example of the recording structure of the content recording method to which the embodiment is applied is shown. An example of the recording structure of the content recording method to which the embodiment is applied is shown. An example of the recording structure of the content recording method to which the embodiment is applied is shown. An example of a content recording method to which the embodiment is applied will be described. An example of the operation of the content recording method to which the embodiment is applied is shown. An example of the operation of the content recording method to which the embodiment is applied is shown. An example of the operation of the content recording method to which the embodiment is applied is shown. Another example of the operation of the content recording method to which the embodiment is applied will be shown.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows an example of an electronic device that processes content, such as a television broadcast receiver. In the embodiment, a television broadcast receiving device (hereinafter referred to as a television device) will be described as an example of an electronic device. However, a recorder device including a recording device / recording unit capable of recording (saving) or reproducing content, The recording device may be connected to a television device. Further, the size of the recording device / recording unit, whether it can be carried (moved), the driving method, etc. are arbitrary. The elements / configuration described below may be realized by hardware, or may be realized by software by a microcomputer (processing device, CPU (Central Processing Unit)). . Content acquisition or output methods include the use of spatial waves (radio waves), the use of cables (including optical fibers) and Internet protocol (IP) communication networks, or the use of recording media such as semiconductor memories. Use, etc. are optional.

  The content may be referred to as a stream, a program, or information, and includes video, audio, music, and the like. In addition, the video includes a moving image and a still image, or text (information represented by characters or symbols indicated by a coded code string), and any combination thereof.

  In FIG. 1, a television broadcast receiver (hereinafter referred to as a television device) 1 includes a receiver 111, a demodulator 112, a signal processor 113, an audio processor 121, a video processor 131, a display processor 132, and a controller. (MPU, Main Processing Unit) 150, storage (recording unit / recording medium) 161, operation input unit 171, light receiving unit 172, and the like are provided at least. In addition, the television apparatus 1 includes a speaker 122 and a display 134. Note that the LAN interface 181, the USB controller 182, the HDMI processing unit 183, and the like are connected to the MPU 150.

  The receiving unit 111 receives content (broadcast signal) provided by a broadcaster (broadcast station) by broadcasting (spatial wave), for example, and performs channel selection (program selection). The receiving unit 111 can also receive content (streams / programs) provided by a distribution provider (content provider) by a wired or wireless system. The receiving unit 111 inputs the broadcast signal selected from the channel selection or program to the demodulation unit 112.

  The demodulator 112 demodulates the broadcast signal from the receiver 111. The demodulator 112 inputs the demodulated content to the signal processor 113.

  The signal processing unit 113 includes, for example, a DSP (Digital Signal Processor), and the content (digital signal) demodulated by the demodulation unit 112 is converted into a video signal and an audio signal, and a data signal other than the video signal and the audio signal (text information (Electric Program guide, electronic program guide), license information (CAS information), DRM (content protection method) information, etc.). The signal processing unit 113 supplies the separated audio signal to the audio processing unit 121 and the video signal to the video processing unit 131. The signal processing unit 113 also supplies a data signal to the control unit 150.

  The audio processing unit 121 converts the audio signal from the signal processing unit 113 into an audio signal in a format that can be reproduced by the speaker 122 and supplies the audio signal to the speaker 122. The speaker 122 reproduces sound and / or sound (Audio) from the supplied audio signal.

  The video processing unit 131 converts (display processing) the video signal from the signal processing unit 113 into a display signal in a format that can be reproduced (displayed) by the display 134 and outputs the display signal to the display processing unit 132.

  The OSD processing unit 133 displays a GUI (Graphical User Interface) based on a data signal supplied from the signal processing unit 113 and / or a control signal supplied from the control unit 150, subtitles, time, or other The OSD (On Screen Display) signal for displaying the above information and the like superimposed on the display signal from the video processing unit 131 is generated.

  The display processing unit 132 displays, for example, the color, brightness, sharpness, or contrast of the image for each frame when the display 134 displays the video signal from the video processing unit 131 as a display video (screen display). The image quality adjustment processing is performed so as to be within a predetermined condition within a range of conditions that can be reproduced (displayed). Note that control information for image quality adjustment processing (a control amount by numerical input or a control amount by visual instruction input using a display image by GUI) is an operation input unit 171 or a remote controller (hereinafter referred to as a remote controller) described later. 173) or a control instruction according to an application (software) held by a portable terminal device (hereinafter referred to as a mobile terminal) called a tablet device or a smartphone.

  The display processing unit 132 also superimposes the display signal from the video processing unit 131 and the OSD signal from the OSD processing unit 133 after the image quality adjustment processing, and supplies the superimposed signal to the display 134.

  The display 134 is, for example, a liquid crystal display device including a liquid crystal display panel including a plurality of pixels arranged in a matrix and a backlight that illuminates the liquid crystal panel, and an image corresponding to a display signal from the display processing unit 132. (Video) is displayed.

  Note that the television device 1 may be configured to include a video output terminal instead of the display 134. Further, the television device 1 may be configured to include an audio output terminal instead of the speaker 122.

  The control unit 150 functions as an MPU (Main Processing Unit) that controls the operation of each unit of the television apparatus 1. The control unit 150 includes a CPU (central control unit) 151, a ROM (read only memory) 152, a RAM (rewritable (random access) memory) 153, an EEPROM (nonvolatile memory) 154, a recording control unit 155, and the like. The control unit 150 performs various processes based on an instruction input (user operation) from the operation input unit 171 or the remote controller 173 via the light receiving unit 172.

  The CPU 151 includes arithmetic elements that execute various arithmetic processes, firmware, a memory area, and the like. The CPU 151 implements various functions by executing programs stored in the ROM 152 and the EEPROM 154.

  The ROM 152 holds a program for controlling the television apparatus 1 and a program for realizing various functions such as copying (copying) and moving (moving) content (program).

  The CPU 151 activates a program held in the ROM 152 in accordance with an instruction input from the operation input unit 171 or the remote controller 173 or a control instruction according to an application held by a portable terminal or the like. Thereby, the control part 150 controls operation | movement of each part.

  The RAM 153 functions as a work memory (working area) for the CPU 151. The calculation result of the CPU 151, the data read by the CPU 151, the instruction input from the operation input unit 171 or the remote controller 173, or the above-described application such as a portable terminal Control instructions according to the above, that is, control commands and the like are stored.

  The EEPROM 154 stores various setting information and programs.

  The recording control unit 155 is, for example, an external HDD (Hard Disk Drive) that supports an NSM (Next Generation Secure Memory initiative) standard, which is a kind of content protection standard, or a recording medium that is integrated with the television apparatus 1. / Recording and managing information such as encrypted content (program) and content key in the storage 161 which is a recording unit. The storage 161 may be, for example, a semiconductor memory device such as an SSD (Solid State Drive) or a memory card that can read and write data using a reader / writer. It is assumed that the storage device supports the content protection function conforming to the NSM standard.

  The operation input unit 171 inputs an operation signal corresponding to a user operation (instruction input) to the control unit 150, and is, for example, an operation key (operation panel). The operation input unit 171 may be, for example, a keyboard, mouse, touch pad, or any type of input device that generates an operation signal corresponding to an operation. Note that when the display 134 is integrated with the television device 1 and has a touch panel function, the operation input unit 171 may be a touch panel formed integrally with the display 134.

  The remote controller 173 generates an operation signal corresponding to the user operation that allows the light receiving unit 172 to identify the operation input by the user. The remote controller 173 transmits the generated operation signal to the light receiving unit 172 by, for example, communication using infrared rays.

  The light receiving unit 172 receives an operation signal from the remote controller 173 and supplies, for example, an instruction signal to the CPU 151 as an instruction to the CPU 51 corresponding to the operation signal. The CPU 151 controls the operation of each unit corresponding to the user operation by the remote controller 173 or implements the function according to the instruction signal from the light receiving unit 172.

  Note that the instruction signal from the remote controller 173 to the light receiving unit 172 may be, for example, wireless communication using a predetermined frequency and an output radio wave.

  The LAN interface 181 makes it possible to share content with other television devices, recorder devices, or external tuners on a home network (DLNA, Digital Living Network Alliance (registered trademark)). The LAN interface 181 can be connected to the Internet via a public communication line, and controls downloading of content provided by any server or provider on the Internet.

  The USB controller 182 enables data exchange with a USB device (external device) connected via a USB (Universal Serial Bus) standard interface, for example, a USB-HDD (NAS, Network Attached Storage), or a memory card. When an extension reader / writer or the like is connected, data is exchanged with a USB device as a connection partner, that is, data is read and written. When a device connected via a USB-HDD or an expansion reader / writer can hold content, a predetermined DRM (content protection method) can be applied to the content held by the connection partner according to the control of the recording control unit 155. .

  The HDMI processing unit 183 is an HDMI interface that performs bidirectional communication based on the HDMI (registered trademark), that is, the HDMI (High Definition Multimedia Interface) standard. The HDMI processing unit 183 is connected to a Blu-ray (registered trademark) recorder, a DVD recorder, a hard disk recorder, or a device (HDMI device) compatible with the HDMI standard. The HDMI processing unit 183 can exchange contents (streams) with a connected HDMI device.

  In the television apparatus 1 shown in FIG. 1, a content protection method (a content protection system (hereinafter described as an HDD being integrated) 161, a content held by a USB-HDD connected to the USB controller 182, etc. In accordance with DRM), regulations such as usage rules such as duplication (copying) and movement (move) are applied.

  That is, when the TV apparatus 1 records the broadcast content on the HDD 161, the TV apparatus 1 stores the broadcast content in a device binding method that can be played back only from the recorded device (from the HDD 161) in accordance with the regulations of ARIB (Radio Industry Association). It should be noted that the dubbing 10 content is dubbed 10 of the content held in the HDD 161 only when it is saved by “device binding” (9 copies (duplication) and media from the HDD (may be referred to as recording media, removable media)) Is allowed to move.

  However, content stored by “device binding” cannot be played back on a television device other than the television device 1, so that when the television device is replaced, the recorded content cannot be played back.

  In addition, ARIB (Radio Industry Association), when broadcasting content is recorded with a “media binding” content protection method such as AACS or SAFIA, even in the case of dubbing 10 content, copy once content (copying is impossible, moving is possible) You are requesting to save.

  FIG. 2 to FIG. 4 show an example of a content protection method and management method that enables “dubbing 10” content to be reproduced on devices other than the television device used at the time of recording while securing the right of “dubbing 10”. . In this example, content protection conforming to the NSM (Next generation Secure Memory initiative) standard, which is a kind of “media binding” content protection scheme, and “device binding” content protection scheme are used together. By applying the content protection / management method shown in FIGS. 2 to 4, the content (content with copy count) held in the storage (HDD) shown in FIG. For example, when a TV apparatus is newly purchased by “media bind”, playback is also possible from the TV apparatus (replaced). In the present embodiment, the above-mentioned “media bind” method (first protection method, for example, NSM standard or AACS standard) and the above-mentioned “device bind” method (second protection method) are used together. Features).

  FIG. 2 schematically shows a data holding structure (file structure) in the HDD (storage) in the first protection method (“media bind” method) when NSM is used as the content protection / management method.

  The “media binding” method uses a standardized (standardized) AV format and DRM. When media corresponding to the “media bind” method is connected to a host, if the host complies with the standard, the host can use the protected content stored according to the standard.

  As shown in FIG. 2, the content data file 10 in the HDD includes an AV format (content and content additional information) 11 and a DRM layer 12 for the AV format layer 11. As an actual (operational) holding form, each file may be composed of a plurality of files.

  FIG. 3 schematically shows a data holding structure (file structure) in the HDD (storage) when the second protection method (“device binding” method) is used as the content protection method.

  In the “device binding” method, it is a requirement that the device that reproduces the content is the same device as that used during recording (content). Accordingly, the content recording format (AV format) and DRM can be uniquely defined.

  As shown in FIG. 3, the content data file 20 in the HDD includes a unique AV format layer 21 and a unique DRM layer 22 unique to the device used at the time of recording. In addition, as an actual (operational) holding form, each file can be configured by a plurality of files.

  FIG. 4 schematically shows an example of a data holding structure (file structure) in the HDD that holds the first protection method (“media binding” method) and the second protection method (“device binding” method). .

  As shown in FIG. 4, the content data file 30 includes content data file 40 protected by the first protection method (“media binding” method) and content data protected by the second protection method (“device binding” method). File 50.

  The content data file 40 protected by the first protection method includes a data file 41 having the same format as the data file 11 shown in FIG. 2 and a DRM file 42 having the same format as the standardized DRM file 12.

  The content data file 50 protected by the second protection method includes a data file 51 having the same format as the data file 21 shown in FIG. 3 and a DRM file 52 having the same format as the original DRM file 21.

  The data file 30 shown in FIG. 4 is prepared according to the following method shown in FIGS. 5A and 5B, ie, “device binding” method processing and “media binding” method processing, under the control of the recording control unit 155. Hold.

<< Processing for "device binding" method >>
Generate content management information for “device binding” method [60].
Generate content key for “device binding” method [61].
Save the content key for "device binding" method and UsageRule (character string / description) [62].
Encrypt content with content key for “device binding” method [63].

    Save the encrypted content encrypted by the “device binding” method [64].

<< Process for "Media Binding" Method >>
Generate content management information for the “media binding” method [70].
Generate content key for “media bind” method [71].
Save the content key for "media bind" method and UsageRule (character string / descriptive text) [72].
Encrypt the content with a “media bind” content key [73].
Save the encrypted content encrypted with the “media bind” method [74].
Note that UsageRule (character string / description) describes the copy count and whether or not the move is possible as follows.
Copy not possible, move allowed {Usage Rule (copy 0, move 1)}
Cannot copy, cannot move {Usage Rule (copy 0, move 0)}
9 copies can be moved {Usage Rule (copy 9, move 1)}.

That is, in the content data file having the data holding structure schematically shown in FIGS. 4, 5 </ b> A, and 5 </ b> B, the embodiment will be individually described with reference to FIGS. 7 to 10.
In the method of FIG. 7, two recordings are executed: device-bound recording and media-bound recording. For example, in the case of dubbing 10 content, a file that is recorded in the device binding method and then dubbed (copied) to the media binding method one by one is shown. The structure is as shown in FIG. Regarding Usage Rule, the copy count was 9 times (copy 9, move 1) when recording in the device binding method, and when copying to the media binding method, the device binding method copy count was consumed once. Therefore, the Usage Rule is updated to (copy 8, move 1), and the Media Binding Usage Rule is held in a state where copying is impossible and movement is possible (copy 0, move 1).

In recording by device binding, encrypted content 2 (Encrypted Content 2) 84 obtained by encrypting content using content key 2 and encryption key 2 obtained by encrypting content key 2 using device ID (identification), for example. (Encrypted Key 2) 85, UR2 (Usage Rule 2 (copy 8, move 1)) 86 and content information 2 (Content Information 2) 83 are stored. In the recording by the media binding , the encrypted content 1 (Encrypted Content 1) 74 obtained by encrypting the content using the content key 1 and the encrypted key 1 (Encrypted Key 1) 75 obtained by encrypting the content key 1 according to the media binding method. And UR1 (Usage Rule 1 (copy 0, move 1)) 76 and content information 1 (Content Information 1) 73 are stored.

  That is, the data holding structure in the HDD shown in FIG. 7 includes a standardized AV format and a standardized DRM, that is, a first recording area 70 corresponding to the first protection method (“media bind” method) and a unique AV format. And a second recording area 80 corresponding to the second protection method (“device binding” method).

  The first recording area 70 includes the content recording format described with reference to FIG. 2, that is, the AV format 71 and the DRM information holding area 72.

  The format information holding area 71 includes a data file (Content Information 1) 73 that holds content metadata and an encrypted content (Encrypted Content 1) 74.

  The DRM information holding area 72 includes an encryption key (Encrypted Key 1) 75 that encrypts the content key 1 for decrypting the encrypted content file 74 and a UsageRule (UR 1 (Copy 0, Move 1)) 76.

  The second recording area 80 includes the content recording format described with reference to FIG. 3, that is, the unique AV format 81 and the DRM information holding area 82.

  The format information holding area 81 includes a data file (Content Information 2) 83 that holds content metadata and an encrypted content (Encrypted Content 2) 84.

  The DRM information holding area 82 includes an encryption key (Encrypted Key 2) 85 obtained by encrypting the content key 2 for decrypting the encrypted content file 84 and a UR file (UR 2 (Copy 8, Move 1)) holding the UsageRule. 86.

  The method of FIG. 8 is almost the same as that of FIG. 7, but the same key as the content key 1 for the device binding method is used as the content key for the media binding method, and the encryption scheme method of the device binding method is used. Uses the same scheme as the media binding method. That is, the encrypted content 74 and the encrypted content 94 are the same data. Note that the same content key is used for the first protection method (media binding method) and the second protection method (device binding method), but since the storage method is different, the device binding method and the media binding method are used. The values of the encryption keys 75 and 95 stored are also different.

  Specifically, as described above, the encryption key 75 is a key obtained by encrypting the content key according to the media binding method, and the encryption key 95 is a key obtained by encrypting the content key according to the device binding method.

  That is, the data holding structure in the HDD shown in FIG. 8 includes a first recording area 70 corresponding to the first protection method and a second recording area 90 corresponding to the second protection method, as in FIG. Including.

  The second recording area 90 includes an AV format information holding area 91 and a DRM information holding area 92.

  The format information holding area 91 includes content metadata 83 and encrypted content 1 (Encrypted Content 1) 94.

  The DRM information holding area 92 includes an encryption key (Encrypted Key 1) 95 and UsageRule (UR 2 (Copy 8, Move 1)) 86 obtained by encrypting the content key 1 for decrypting the encrypted content (Encrypted Content 1) 94. Including.

  Accordingly, in the embodiment shown in FIG. 8, the two encrypted contents prepared in the embodiment shown in FIG. 7 are the same, and the encryption process of the contents can be performed once.

  The method of FIG. 9 is almost the same as that of FIG. 8, and the difference is that in FIG. 8, the encrypted contents 74 and 84 store two identical data, but in FIG. 9, only one is stored. It is that you are.

  That is, the embodiment shown in FIG. 9 enables effective use of the recording area of the storage 161 by sharing the two encrypted content files 94 realized in the embodiment shown in FIG.

  The method of FIG. 10 is almost the same as the method of FIG. 9 except that content information (Content Information 1) 73 and (Content Information 2) 83 are stored for each method in FIG. 10 is to refer to the content information (Content Information 1) 111 from both formulas. When content is dubbed, first, the “device binding” copy count is consumed.

When the copy count is “0”, the “device binding” type content is moved, and all the “device binding” type data is deleted.
9 and 10, not only UR2 but also UR1 (UR 1 (Copy 0, Move 1)) is associated with the content stored in the storage unit. And in UR1, the content rights remain. For this reason, unlike the normal move process, the data in the DRM unit of the device binding method is deleted while the content remains in the storage unit. 7 and 8, when the content associated with UR2 is moved, the content (AV format and DRM data) in the storage unit is deleted as in the normal move process.
FIG. 6 shows the processing sequence shown in FIG. 9 or FIG.

  If there is an instruction to start dubbing, first check the Usage Rule [101], and if the Usage Rule has the remaining copy rights for "device binding" [102-YES], perform the dubbing processing of the content data, The copy count of UR2 is decremented by 1 (one copy count is consumed) [103].

  If there is no remaining copy right for “Device Binding” in the confirmed Usage Rule [102-NO], it is checked whether there is any remaining copy right for “Device Binding” [104], and there is a move right. In the case [104-YES], the “device binding” type content data move process is performed [105]. In this case, in the example shown in FIGS. 9 and 10, the data in the device binding DRM unit is deleted while the content remains in the storage unit. 7 and 8, when the content associated with UR2 is moved, the content (AV format and DRM data) in the storage unit is deleted as in the normal move process.

  When there is no remaining copy right of “device bind” in the confirmed Usage Rule [102-NO], and there is no remaining copy right of “device bind” [104-NO], “media bind” The content data of the method is moved [106]. In this case, in the example shown in FIGS. 9 and 10, after the move process, the data of the “device binding method” DRM unit is deleted. 7 and 8, the content (AV format and DRM data) in the storage unit is deleted along with the move process.

  That is, in the embodiment, the content data, the first encryption key obtained by encrypting the content key in accordance with the first protection method, the first Usage Rule corresponding to the first encryption key, and the content key are bound to the device. Recording control means for associating a second encryption key encrypted in accordance with a second protection method of the method and a second Usage Rule corresponding to the second encryption key and recording them in a recording device; An encryption unit that encrypts the content using the content key in accordance with the first protection method of the bind method and generates encrypted content data, and the encryption unit encrypts the content with the content key. The first content data and the second content data are generated, and the recording control means adds the first encryption key and the first content data to the first content data. The UsageRule is associated with the second content data, and the second encryption key and the second UsageRule are associated with the second content data and recorded on the recording device. The encryption unit generates content data obtained by encrypting the content with the content key, and the recording control unit performs the first encryption key, the first UsageRule, the second encryption key, and the content data on the content data. The second UsageRule is recorded in association with the recording device.

  In both the “device binding” method and the “media binding” method, for example, a common key encryption method represented by AES (Advanced Encryption Standard) can be used for content encryption and decryption. However, as described above, the “media bind” method uses a method that can ensure compatibility and interoperability.

  That is, in the embodiment shown in FIG. 10, only one encrypted content data (file) is prepared, and the key file and the DRM process for the “media bind” method and the DRM process for the “device bind” method are Only Usage Rules are prepared for each DRM system.

  Accordingly, the occupation ratio of the recording area in the storage 161 and the load required for creating the encrypted file can be reduced. In other words, the recording area of the storage 161 can be used effectively, and the processing load for encrypting the content can be reduced.

  Therefore, “Dubbing 10” can be used only by the “device binding” method that is effective only for the recording device used at the time of recording, and also supports the “media binding” method, so that the recording device used at the time of recording is used. It is also possible to play with other than.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Electronic device (television receiver), 113 ... Information acquisition means (signal processing part), 150 ... Control means (main control block / MPU), 155 ... Signal processing means (recording control part), 161 ... Storage means ( Storage / recording unit), 182... Storage means (storage / recording unit).

Claims (6)

First recording means for generating a first encrypted content by encrypting the content according to the first protection method of the device binding method, and recording the first encrypted content on a recording device;
From the first encrypted content recorded on the recording device, a second encrypted content encrypted according to the second protection method of the media binding method is generated and recorded on the recording device A second recording means;
With
The second recording means generates the second encrypted content by reducing the number of copies of the first encrypted content;
The second encrypted content is an electronic device associated with a UsageRule that cannot be copied and can be moved once. The electronic device according to claim 1, wherein the second encrypted content can be shared with the first encrypted content. 3. The second encrypted content according to claim 1, wherein when the second encrypted content is played back, the second encrypted content is decrypted with a content key that is the same as a content key used when the first encrypted content is encrypted. Electronics. Using the electronic device, the content is encrypted according to the first protection method of the device binding method, the first encrypted content is generated and recorded on the recording device ,
In the method of generating the second encrypted content encrypted according to the second protection method of the media binding method from the recorded first encrypted content, and recording the second encrypted content on the recording device ,
The electronic device, when generating the second encrypted content, the first decremented by 1 copy possible number of the encrypted content, the second copy never encrypted content and move one possible Correlate with UsageRule,
Recording method. The second encrypted content, the first recording method according to claim 4, wherein the encrypted content can be shared. The time of reproducing the second encrypted content according to claim 4 or 5 for decoding the second encrypted content by the content key and the same content key used when encrypting the first encrypted content Recording method.

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