JP2008176680A - Portable disk unit - Google Patents

Abstract

CPRM supports only a specific medium such as a DVD, and other portable disk devices cannot perform data recording by CPRM. Further, for example, since iVDR complies only with serial ATA, there is a problem that a connection adapter or the like must be provided when connecting to a different interface of an external device.
A portable disk device having an interface unit for connection to an external device, a disk unit, and a plurality of driver units for driving the disk unit is proposed. The portable disk device holds key information including a media ID and a media key block, acquires a device key from a CPRM compatible external device connected to the interface unit, and uses the media ID, the media key block, and the device key. Then, the encryption / decryption process may be executed.
[Selection] Figure 1

Description

  The present invention relates to a portable disk device that has a plurality of drivers and can be used as a recording medium in accordance with the CPRM copy-once standard in addition to the conventional data storage function.

  CPRM (Content Protection for Recordable Media) is one of the technologies for realizing the so-called copy-once for prohibiting copying content from the recorded media to other devices or media when recording digital content on the media. There is a way. CPRM is currently used in DVD and SD memory cards. FIG. 18 is a diagram illustrating an encryption method by CPRM. As an example, a case where the CPRM compatible recording medium is a DVD is shown. First, in order to perform recording / reproduction by normal CPRM, a CPRM compatible DVD recorder (1801) is required. When digital content is encrypted and recorded on the CPRM compatible DVD medium (1802) by the CPRM compatible DVD recorder (1801), the device key (1804) of the DVD recorder (1801) is used to store the DVD content (1802). The media key (1806) is generated by processing the media key block (1805) written in the lead-in area (1803). Further, a media unique key (1808) is generated from the media key and the media ID (1807) written in the lead-in area (1803) of the DVD media (1802), and the content is obtained using the media unique key (1808). Encrypt.

By the way, a portable disk device represented by a portable hard disk, an iVDR (Information Versatile Disk for Removable usage), a compact flash (registered trademark), and the like conventionally has a data storage as its main function. Taking iVDR as an example, iVDR conforms to serial ATA as a standard specification (Non-Patent Document 1).
iVDR Consortium, “About iVDR”, [online], iVDR Consortium, [December 26, 2006 search], Internet <URL: http://www.ivdr.org/iVDR/ivdr_j.html>

  By the way, CPRM currently supports only specific media such as DVDs and SD memory cards, and other portable disk devices such as iVDR do not support recording and playback by CPRM. I can't do it. For example, even if iVDR is connected to a DVD recorder via an ATA interface, the DVD recorder cannot normally recognize iVDR as a DVD medium. Further, for example, since iVDR conforms only to serial ATA, there is a problem that when connecting to a different interface such as a USB (Universal Serial Bus) of a personal computer or the like, a conversion adapter or the like must be provided.

  Accordingly, the present invention proposes a portable disk device having an interface unit for connection with an external device, a disk unit, and a plurality of driver units for driving the disk unit. Further, at least one of the plurality of driver units may be a CPRM compatible driver unit having a driver function for causing the disk unit to function as a medium compatible with the CPRM copy once standard from an external device. In addition, the portable disk device holds key information including a media ID and a media key block conforming to the CPRM copy once standard, and when the external device connected to the interface unit is a device compatible with the CPRM copy once standard, A device key that conforms to the CPRM copy once standard is obtained from the external device via the interface unit, and the encryption that conforms to the CPRM copy once standard is performed using the media ID and media key block held by itself and the device key that is obtained from the external device. The decoding / decoding process may be executed.

  FIG. 1 is a conceptual diagram of a portable disk device according to the present invention. The portable disk device (0101) holds key information (0105) including a media ID and a media key block. This key information is data written in the lead-in area in the case of a DVD medium as described with reference to FIG. In the case of the portable disk device according to the present invention, instead of lead-in, it may be held in a predetermined storage area such as a flash memory. The portable disk device (0101) has a plurality of driver units (not shown) inside. As a result, it is possible to recognize itself as a CPRM-compatible medium such as a DVD medium, in addition to causing the external device to recognize itself as a hard disk having a simple data storage function, as in the past. Here, for example, a CPRM compatible DVD recorder (0102) is connected to the portable disk device (0101) via the interface unit (0111), and digital content (0103) to be encrypted and recorded by CPRM is obtained from the DVD recorder. Suppose that Then, the portable disk device (0101) acquires the device key (0104) held by the DVD recorder (0102) from the DVD recorder (0102). Since the portable disk device has a mechanism for executing encryption / decryption processing in accordance with the CPRM standard, the portable disk device has a media ID, a media key block, as in the case of a normal CPRM compatible electronic device. The digital content (0103) is encrypted using (0105) and the device key (0104), and is recorded as the encrypted content (0107) on the disc unit (0106). When the encrypted content (0107) is played back on the DVD device (0102), the encrypted content (0107) is decrypted by a process reverse to this process, and the decrypted content is displayed in the interface unit (0111). ) To a DVD device or the like. As a result, the DVD device can play back digital content. For example, when normal content (0109) that is connected via the interface unit (0111) and is not encrypted is obtained from a personal computer or the like (0108) that does not support CPRM, it is recorded as it is in the disc unit (0106). It is also possible (0110).

  The interface unit may be configured to be capable of a plurality of connection terminals each corresponding to a different communication protocol and protocol processing corresponding to each communication protocol. In addition, each of the plurality of connection terminals may be provided on the relative surfaces of the casing. In addition, content that conforms to the CPRM copy-once standard recorded on the disc unit using any one of the plurality of connection terminals is recognized and played back via a connection terminal other than the connection terminal used for recording. The interface unit may be controlled so that it cannot be performed.

  Conventionally, only specific media such as DVD media and SD memory cards can encrypt and record content in accordance with the CPRM standard. However, the portable disk device of the present invention itself can be used as a CPRM-compatible media to an external device. By recognizing and acquiring the device key from the external device, the content can be encrypted and recorded in accordance with the CPRM standard. In addition, since the interface unit has a plurality of connection terminals corresponding to different communication protocols and a protocol processing mechanism corresponding to each communication protocol, for example, while connecting to a DVD device compatible with CPRM, on the other hand, other external devices such as a personal computer It can be connected to a device.

The best mode for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to these embodiments, and can be implemented in various modes without departing from the scope of the invention. In the first embodiment, claims 1 and 2 will be mainly described. The second embodiment will mainly describe claim 3 and the like. The third embodiment will mainly describe claims 4 and 5. In the fourth embodiment, claim 6 will be mainly described.
(Embodiment 1)

  (Embodiment 1: Overview) In this embodiment, a portable disk device having an interface unit for connection to an external device, a disk unit, and a plurality of driver units for driving the disk unit will be described. In addition, a case where at least one of the plurality of driver units has a driver function for causing the disk unit to function as a medium corresponding to the CPRM copy once standard from an external device will be described.

  (Embodiment 1: Configuration) FIG. 2 illustrates a functional block diagram of a portable disk device according to this embodiment. The portable disk device (0200) includes an “interface unit” (0201), a “disk unit” (0202), and a plurality of “driver units” (0203a, 0203b). The portable disk device (0200) is a recording medium that is detachable from an external device, and examples thereof include a portable hard disk, iVDR, SD memory card, compact flash (registered trademark), and memory stick.

  Note that each unit, which is a component of the present invention described in detail below, is configured by either hardware, software, or both hardware and software. For example, as an example for realizing these, when a computer is used, there are hardware configured by a CPU, a bus, a memory, an interface, a peripheral device, and the like, and software that can be executed on the hardware. As software, the functions of the respective units are realized by sequentially executing the programs developed on the memory, and processing, storing, and outputting data on the memory and data input via the interface. (The same applies throughout the specification.)

  The “interface unit” (0201) has a function for connection with an external device. The interface unit may have only one connection terminal or may have a plurality of connection terminals. Specifically, various interfaces such as serial ATA, USB, RS232, SCSI (Small Computer System Interface) can be considered as the interface unit. As a main function of the interface unit, a communication signal received from a cable is interpreted according to a communication protocol, and the interpreted data is stored in a predetermined storage area such as a main memory. The interface unit may include a program for performing such processing.

  The “disc portion” (0202) has a storage area for recording data. The storage area for recording data is mainly assumed to be a hard disk, but may be other storage devices. However, since it is assumed that data is continuously stored for a certain period of time, a nonvolatile storage device that can maintain data even when the power is turned off is considered preferable. The disk unit may be physically provided inside the portable disk device (0200) or may be connected to the outside. Furthermore, the disk unit may be fixed so that it cannot be attached to or detached from the portable disk device (0200), or may be attachable / detachable. Further, as will be described later, it is assumed that encrypted data encrypted according to the CPRM standard is recorded on the disk unit. However, data encrypted according to the CPRM standard and the encrypted data are encrypted. Data that has not been made may be recorded so as to be mixed in one storage area, or may be stored in separate storage areas. When recording in a single storage area, an encrypted flag is added to the data in order to identify encrypted data and unencrypted data. A management table associated with an encryption flag may be held. In addition, storing in separate storage areas corresponds to, for example, a case where the disk unit is divided into two partitions, one of which is used as an encrypted data storage area and the other as an unencrypted data storage area.

  The “driver section” (0203) has a function for driving the disk section. A plurality of driver units exist in the portable disk device. “Driving the disk unit” means not only physically moving the disk unit but also including exchanging data with the external device in order to recognize the disk unit from the external device. More specifically, the exchange of data means that the portable disk device performs processing by interpreting commands and data transmitted from the external device via the interface unit, or the portable disk device performs the external device processing. For example, outputting data via an interface unit is applicable. In other words, the presence of a plurality of driver units allows the external device to recognize the portable disk device as a recording medium of a different standard. The conventional portable disk device is only recognized as a hard disk or the like having a data storage function by an external device. However, the portable disk device according to the present embodiment has a plurality of driver units, thereby enabling DVD media and SD. It can be recognized as a memory card or the like. It should be noted that which driver unit of the plurality of driver units operates is basically independent of the type of external device connected in the interface unit. Further, the switching of the plurality of driver units may be performed automatically or manually by the user. The case of being automatically switched corresponds to, for example, automatically switching to a DVD driver when transmitting data to be transmitted as DVD data. In addition, when switching manually by the user, for example, it is possible to set by a GUI (Graphical User Interface) from an external device connected to the interface unit, or a physical switch provided in the portable disk device This corresponds to the case of switching by.

  Further, at least one of the plurality of driver units may be a CPRM compatible driver unit having a driver function for causing the disk unit to function as a medium compatible with the CPRM copy once standard from an external device. That is, as illustrated in FIG. 3, the portable disk device (0300) includes an “interface unit” (0301), a “disk unit” (0302), a “CPRM compatible driver unit” (0303a), and other One or more “driver units” (0303b) may be included. The “CPRM copy-once standard” is the CPRM copy-once standard described with reference to FIG. 18, and the “media corresponding to the CPRM copy-once standard” currently corresponds to a DVD or an SD memory card. Therefore, for example, when the external device connected to the interface unit is a DVD device that complies with the CPRM copy-once standard, the CPRM compatible driver unit operates, so that the portable disk device can be used as a CPRM compatible DVD medium. Can be exchanged as data.

  FIG. 4 shows an operation example of the portable disk device when at least one of the plurality of driver units is a CPRM compatible driver unit. For example, if the portable disk device (0401) is connected to a CPRM compatible DVD recorder (0405), the portable disk device (0401) operates the CPRM compatible driver unit (0402) to operate the DVD recorder (0405). Are recognized as DVD media. That is, when data is transmitted / received to / from the DVD recorder (0405), the disk unit (0404) is accessed using the CPRM compatible driver unit (0402). For example, when the portable disk device (0401) is connected to a personal computer or the like (0406) not supporting CPRM and the portable disk device is recognized as a normal hard disk and data is recorded, By operating the hard disk (HDD) driver unit (0403) which is a driver unit, the disk unit (0404) can be accessed as a medium (hard disk) having a general data storage function.

(Embodiment 1: Effect) According to the portable disk device of this embodiment, by having a plurality of driver units, it is possible to make an external device recognize the portable disk device as a medium of different standards. In addition, in the case of having a CPRM compatible driver unit, the portable disk device can be recognized by an external device as a medium compatible with the CPRM copy once standard.
(Embodiment 2)

  (Embodiment 2: Overview) This embodiment is an apparatus that holds key information including a media ID and a media key block in accordance with the CPRM copy once standard, and an external device connected to the interface unit supports the CPRM copy once standard. In this case, a device key that conforms to the CPRM copy once standard is acquired from the external device via the interface unit, and encryption that conforms to the CPRM copy once standard is performed using the media ID and media key block that are held and the device key that is acquired. A description will be given of a portable disk device that can execute a decryption process.

  (Embodiment 2: Configuration) FIG. 5 illustrates a functional block diagram of a portable disk device according to this embodiment. The portable disk device (0500) includes an “interface unit” (0501), a “disk unit” (0502), a “driver unit” (0503a, 0503b), a “key information holding unit” (0504), “ A device key acquisition unit "(0505) and an" encryption / decryption processing unit "(0506). At least one of the driver units (0503a, 0503b) is a “CPRM compatible driver unit” (0503a). Since the configuration other than the “key information holding unit” (0504), the “device key acquisition unit” (0505), and the “encryption / decryption processing unit” (0506) is the same as that of the first embodiment, the description thereof will be omitted.

  The “key information holding unit” (0504) holds key information including a media ID and a media key block in accordance with the CPRM copy once standard. “Media ID” and “Media Key Block” indicate the media ID and media key block described in FIG. 18, and are information written in the lead-in in the case of a conventional CPRM compatible DVD medium. As a matter of course, the portable disk device is premised on that there is no lead-in area, so that it may be stored in a storage area such as a flash memory as an alternative to the lead-in area. That is, the key information holding unit can be realized by holding a media ID and a media key block in a storage area such as a flash memory. The flash memory or the like may be physically provided inside the portable disk device (0500) or connected to the outside. Further, the flash memory or the like may be fixed so that it cannot be attached to or detached from the portable disk device (0500), or may be removable. FIG. 6 is a conceptual diagram of key information. The key information is information including a media ID and a media key block. In addition, since it is better that the media ID and media key block are not rewritten, it is more preferable that the media ID and the media key block are stored in a read-only memory such as a ROM (Read Only Memory). It is.

  When the external device connected to the interface unit is a device that supports the CPRM copy once standard, the “device key acquisition unit” (0505) sends a device key that conforms to the CPRM copy once standard from the external device via the interface unit. Get. That is, for example, when a CPRM compatible DVD device is connected to the interface unit, the CPRM compatible DVD device has a device key as described with reference to FIG. Get through the department. That is, when the device key acquisition unit acquires a device key via an interface such as serial ATA, USB, RS232, or SCSI, it stores it in a predetermined storage area such as a main memory. Further, the device key acquisition unit may have a program for performing such processing.

  The “encryption / decryption processing unit” (0506) uses the media ID, the media key block, and the device key acquired from the device key acquisition unit stored in the key information storage unit to perform encryption in accordance with the CPRM copy once standard. Execute the decryption / decryption process. “Perform encryption / decryption processing in accordance with the CPRM copy once standard” means that encryption / decryption processing conventionally performed by an external device is performed in the portable disk device. That is, as described in FIG. 18, conventionally, when content is encrypted and recorded on a DVD medium, the encrypted content is recorded by an external device such as a DVD device, and the encrypted content is recorded on the DVD medium. When reproducing the encrypted content, the encrypted content is read from the DVD medium and decrypted by the DVD device or the like. However, in the portable disk device according to the present embodiment, the content before encryption is acquired from the external device via the interface unit, encrypted by the encryption / decryption processing unit, and recorded on the disk unit. Also, when playing back encrypted content on an external device, the encrypted content recorded on the disk unit is read by the portable disk device, decrypted by the encryption / decryption processing unit, and the decrypted content is By outputting to the external device via the interface unit, the content can be played back on the external device. The specific processing of “encryption / decryption processing in accordance with the CPRM copy once standard” is the same as the conventional CPRM standard encryption / decryption processing, and is a generally well-known technique. Detailed description is omitted.

  FIG. 7 shows a specific example of processing in the encryption / decryption processing unit. First, as described above, the portable disk device holds both the media ID and the media key block in the key information holding unit (0704) as key information. The portable disk device is recognized as a CPRM compatible medium by an external device by operating the CPRM compatible driver unit (0702). The portable disk device acquires content data to be encrypted and recorded according to the CPRM standard via the interface unit (0701), and further acquires a device key from an external device by the device key acquisition unit (0703). . In the encryption / decryption processing unit (0705), the acquired content data (0706) is encrypted using the media ID, the media key block, and the device key to obtain the encrypted content (0707), and is stored in the disk unit (0708). Record. When decrypting the encrypted content recorded on the disc unit (0708), the device key is acquired from the external device via the interface unit (0701), and the encryption / decryption processing unit (0705) is obtained. The encrypted content (0707) is decrypted to obtain normal content (0706), which is output to the external device via the interface unit (0701).

  Further, processing on the hardware of the encryption / decryption processing unit will be described with reference to FIG. First, the content data and the device key of the content to be encrypted are received through the input / output interface corresponding to the interface unit and stored in the main memory (0801). Further, the media ID and media key block stored in the flash memory (FROM) corresponding to the key information holding unit are read out to the main memory (0802). Using the device key, media ID, and media key block stored in the main memory, the content data is encrypted to be encrypted content data and stored in the main memory (0803). Further, the encrypted content data is stored in the hard disk (corresponding to the disk portion) (0804). The above is the processing for encrypting content. Further, when decoding, the reverse process is sufficient, and the description is omitted. Note that the processing on the hardware described with reference to FIG. 8 is merely an overview of the processing. (The same applies throughout the specification.)

  (Embodiment 2: Process Flow) FIGS. 9 and 10 illustrate flow charts showing the process flow in the portable disk device according to this embodiment.

  FIG. 9 is a process flow diagram for encrypting content.

  First, content to be encrypted is acquired via the interface unit (S0901). Next, when the external device connected to the interface unit is a device compatible with the CPRM copy once standard, a device key conforming to the CPRM copy once standard is acquired from the external device via the interface unit (S0902). Next, the key information (media ID and media key block) held in the key information holding unit is read (S0903). Next, the media key is generated by processing the media key block with the acquired device key (S0904). Next, a media unique key is generated based on the generated media key and media ID (S0905). Next, the content is encrypted using the generated media unique key (S0906). Next, the encrypted content (encrypted content) is recorded on the disc unit (S0907).

  FIG. 10 is a flowchart of processing when decrypting encrypted content.

  First, the encrypted content recorded on the disc part is read (S1001). Next, a device key conforming to the CPRM copy once standard is acquired from an external device via the interface unit (S1002). Next, key information (media ID and media key block) held in the key information holding unit is read ( S1003). Next, a media key is generated by processing the media key block with the acquired device key (S1004). Next, a media unique key is generated from the generated media key and media ID (S1005). Next, the content is decrypted using the generated media unique key (S1006). Next, the decrypted content is output via the interface unit (S1007).

  Note that the flowcharts of FIGS. 9 and 10 can be regarded as processing flowcharts of programs to be executed by the computer. Further, such a program can be recorded on a medium such as a flexible disk. (The same applies throughout the specification.)

(Embodiment 2: Effects) The portable disk device according to the present embodiment can function as a CPRM-compatible medium by performing encryption / decryption processing corresponding to the CPRM copy-once standard by itself.
(Embodiment 3)

  (Embodiment 3: Overview) In this embodiment, a description will be given of a portable disk device in which an interface unit is capable of a plurality of connection terminals each corresponding to a different communication protocol and protocol processing corresponding to each communication protocol. In addition, a description will be given of a portable disk device in which each of the plurality of connection terminals is provided on a relative surface of the casing.

  (Third Embodiment: Configuration) FIG. 11 illustrates a functional block diagram of a portable disk device according to this embodiment. The portable disk device (1100) includes an “interface unit” (1101), a “disk unit” (1102), and a plurality of “driver units” (1103a, 1103b). The interface unit (1101) includes a plurality of “connection terminals” (1107a, 1107b, 1107c) and “protocol processing means” (1108). Further, at least one of the plurality of driver units (1103a, 1103b) may be a CPRM compatible driver unit. Further, the portable disk device may include a key information holding unit, a device key acquisition unit, and an encryption / decryption processing unit. Since the configuration other than the plurality of “connection terminals” (1107a, 1107b, 1107c) and the “protocol processing means” (1108) is the same as that of the first or second embodiment, a description thereof will be omitted.

  There are a plurality of “connection terminals” (1107), each of which corresponds to a different communication protocol. The “protocol processing means” (1108) corresponds to each communication protocol, and performs protocol analysis of data transmitted / received via the connection terminal. The phrase “each corresponds to a different communication protocol” includes not only the case where all the connection terminals have different protocols but also the case where several connection terminals have the same protocol. For example, there may be a case where there are three connection terminals, one corresponds to serial ATA, and two correspond to USB. FIG. 12 shows an example of the operation of the portable disk device having two connection terminals. The portable disk device (1200) has two connection terminals (1201, 1202), the connection terminal 1201 corresponds to serial ATA, and the connection terminal 1202 corresponds to USB. Then, for example, a DVD device (1203) compatible with CPRM is connected to the connection terminal 1201 and the encrypted content (1204) is recorded on the disk unit, and a personal computer (1205) not compatible with CPRM is connected to the connection terminal 1202 for encryption. Normal content (1206) that is not converted can be recorded on the disc portion. In this case, a driver unit (a CPRM compatible driver unit) for causing the DVD device (1203) to recognize as a DVD medium functions when communicating at the connection terminal 1201, and a PC is connected when communicating at the connection terminal 1202. The driver unit for recognizing it as a hard disk or the like having a general data storage function will function. In this way, since there are a plurality of connection terminals and each supports a different communication protocol, the portable disk device can be connected to a plurality of external devices at a time as shown in FIG. Communication can be performed.

  Further, each of the plurality of connection terminals may be provided on a relative surface of the casing. FIG. 13 shows a specific example in which each of the plurality of connection terminals is provided on the relative surface of the casing. The “relative surface of the housing” in the portable disk device (1300) corresponds to the surface 1301 and the surface 1302, or the surface 1303 and the surface 1304. FIG. 13A shows a case where two connection terminals (1305a, 1305b) are provided on the relative surface of the housing, where the connection terminal 1305a is provided on the surface 1301 and the connection terminal 1305b is provided on the surface 1302. FIG. 13B shows an example in which the portable disk device (1300) includes five connection terminals (1305a, 1305b, 1305c, 1305d, 1305e). The connection terminal 1305a and the connection terminals 1305b and 1305c are provided on the face 1301 and the face 1302, which face each other. Further, the connection terminal 1305d and the connection terminal 1305e are provided on the face 1303 and the face 1304, which are opposed to each other. Since the connection terminals are provided on the relative surfaces of the housing in this way, there is an advantage that the connection portions are not adjacent to each other when the external devices are connected by the connection terminals, so that the connection is easy.

  (Third Embodiment: Process Flow) Since the process flow in the portable disk device according to the present embodiment is the same as the process flow in the portable disk device according to the second embodiment, description thereof is omitted here. .

(Embodiment 3: Effect) According to the portable disk device of this embodiment, by having a plurality of connection terminals corresponding to different communication protocols, a plurality of external devices that transmit and receive data using different communication protocols can be simultaneously used. It is possible to connect and transmit / receive data simultaneously with each external device.
(Embodiment 4)

  (Embodiment 4: Overview) In the present embodiment, content conforming to the CPRM copy-once standard recorded on a disc unit using any one of a plurality of connection terminals is connected to terminals other than the connection terminals used for recording. A portable disk device is described which controls an interface unit so that data cannot be recognized and reproduced via a disk.

  (Embodiment 4: Configuration) FIG. 14 illustrates a functional block diagram of a portable disk device according to this embodiment. The portable disk device (1400) includes an “interface unit” (1401), a “disk unit” (1402), a plurality of “driver units” (1403a, 1403b), and a “key information holding unit” (1404). , “Device key acquisition unit” (1405), “encryption / decryption processing unit” (1406), and “control unit” (1408). At least one of the plurality of driver units is a “CPRM compatible driver unit” (1403a). The interface unit (1401) includes a plurality of “connection terminals” (1407a, 1407b, 1407c) and “protocol processing means” (1408). Since the configuration requirements other than the “control unit” (1409) are the same as the configuration requirements described in any of the first to third embodiments, the description thereof is omitted here.

  The “control unit” (1409) uses the connection terminal other than the connection terminal used for recording the content conforming to the CPRM copy once standard recorded on the disk unit using any one of the plurality of connection terminals. It has a function of controlling the interface so that data cannot be recognized and reproduced. “Content conforming to the CPRM copy-once standard recorded on the disc unit using any one of the plurality of connection terminals” means that the content to be encrypted and the device key are acquired from an external device connected to the connection terminal. It refers to encrypted content when the content is encrypted and the encrypted content is recorded on the disc unit. In addition, the “connection terminal used for recording” refers to a connection terminal that is connected to an external device to acquire content and a device key in order to encrypt and record the content. Further, “data cannot be recognized and reproduced” means that either data recognition or data reproduction or both cannot be performed. The case where the data cannot be recognized is considered when the data stored in the disk unit of the portable disk device cannot be recognized from the external device. . In addition, the data cannot be reproduced means that when the data stored in the disk unit of the portable disk device is confirmed from an external device, the data can be recognized but the data cannot be selected as the data to be read. In some cases, data can be selected but output is not possible.

  A control method in the control unit will be described with reference to FIG. In the portable disk device (1501), it is assumed that a CPRM compatible DVD device (1502) is connected to the connection terminal 1503 and a CPRM non-compatible personal computer (1505) is connected to the connection terminal 1506. Here, the device key and the content to be encrypted are received from the CPRM compatible DVD device (1502), and the content is encrypted by the encryption / decryption processing unit to be the encrypted content (1504), which is recorded on the disc unit. And Here, even if a read command for reading the encrypted content (1504) from the personal computer (1505) is transmitted to the portable disk device (1501), the encrypted content (1504) uses the connection terminal 1503 during recording. Therefore, the data cannot be recognized and reproduced from the personal computer (1505). Further, in order to perform such control in the control unit, it is assumed that the control unit holds information as shown in FIG. That is, the “file name” and the “use terminal” indicating the connection terminal that received the data to be recorded are recorded in association with each other when recording on the disk unit. Here, “T1” and “T2” of the “use terminals” represent the connection terminals 1503 and 1506 illustrated in FIG. That is, 'file021. mpg 'and' file024. mpg 'is content that is encrypted by receiving a device key from a CPRM-compatible DVD device via the connection terminal T1 (1503) and recorded on the disc unit. Since the control unit holds such information, for example, the personal computer connected to the connection terminal T2 (1506) can store the encrypted content 'file021. When trying to read mpg ', a signal indicating output refusal or the like can be output because the connection terminals do not match.

  Processing on the hardware of the control unit will be described with reference to FIG. As a premise, the encrypted content ‘file021. Assume that mpg 'is recorded. Also, the information illustrated in FIG. 16 is also stored on the hard disk as a database. Here, from the connection terminal T2 to which the external device is connected, 'file021. If the mpg 'read command is received, the received read command is stored in the main memory (1701). Further, the connection terminal from which the read command is received is determined, and the information of the connection terminal ‘T2’ is also stored in the main memory. Next, 'file021. An inquiry is made as to the used terminal associated with mpg ', and it is compared with' T2 '(1702). Since the terminal used in the database is ‘T1’ and does not match, it is determined that reading is impossible, and the determination result is stored in the main memory (1703). Finally, the determination result stored in the main memory is output from the connection terminal T2 (1704).

  (Fourth Embodiment: Process Flow) Since the process flow in the portable disk device according to this embodiment is the same as the process flow in the portable disk device according to the second embodiment, description thereof is omitted here. . However, in the case of reading the encrypted content illustrated in FIG. 10, if the data is read through a connection terminal other than the connection terminal used for recording, the encrypted content is recognized and reproduced. Control so that you can not.

  (Embodiment 4: Effect) According to the portable disk device according to the present embodiment, when the encrypted content is to be read through a connection terminal different from that at the time of recording, the data is recognized and reproduced. Therefore, the encrypted content is protected more effectively.

Conceptual diagram of portable disk device according to the present invention Functional block diagram of the portable disk device according to the first embodiment Functional block diagram of the portable disk device according to the first embodiment FIG. 4 is an example of an operation of the portable disk device according to the first embodiment. Functional block diagram of a portable disk device according to Embodiment 2 Key information conceptual diagram Example of processing in the encryption / decryption processing unit Example of processing operations on hardware in the encryption / decryption processing unit FIG. 5 is a flowchart showing a processing flow of the portable disk device according to the second embodiment. FIG. 5 is a flowchart showing a processing flow of the portable disk device according to the second embodiment. Functional block diagram of a portable disk device according to Embodiment 3 Example of operation of portable disk device according to Embodiment 3 Diagram showing an installation example of multiple connection terminals Functional block diagram of portable disk device according to Embodiment 4 Example of control in control unit An example of information held by the control unit Example of processing operations on hardware in the control unit A diagram for explaining a general CPRM encryption method

Explanation of symbols

0101 Portable disk device 0102 DVD recorder for CPRM 0103 Digital content 0104 Device key 0105 Key information (media ID, media key block)
0106 Disk unit 0107 Encrypted content 0108 Non-CPRM compatible personal computer etc. 0109 Content 0110 Content 0111 Interface unit

Claims (6)

An interface unit for connection with an external device;
The disc section,
A plurality of driver units for driving the disk unit;
A portable disk device.   2. The portable disk device according to claim 1, wherein at least one of the plurality of driver units is a CPRM compatible driver unit having a driver function for causing a disk unit to function as a medium compatible with the CPRM copy once standard from an external device. A key information holding unit for holding key information including a media ID and a media key block in accordance with the CPRM copy once standard;
If the external device connected to the interface unit is a device that supports the CPRM copy once standard, a device key acquisition unit that acquires a device key that conforms to the CPRM copy once standard from the external device via the interface unit;
Encryption / decryption processing for executing encryption / decryption processing in accordance with the CPRM copy once standard using the media ID, media key block, and device key acquired from the device key acquisition unit held in the key information holding unit And
The portable disk device according to claim 2, further comprising: The interface part
A plurality of connection terminals each corresponding to a different communication protocol;
Protocol processing means corresponding to each communication protocol,
The portable disk device according to any one of claims 1 to 3, further comprising:   The portable disk device according to claim 4, wherein each of the plurality of connection terminals is provided on a relative surface of the housing.   Content that conforms to the CPRM copy-once standard recorded on the disc portion using any one of the plurality of connection terminals may be recognized and played back via a connection terminal other than the connection terminal used for recording. 5. The portable disk device according to claim 4, further comprising a control unit that controls the interface unit so that the interface cannot be performed.

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