JP2012203490A - Information processor and digital photo frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information processor for effectively preventing secondary utilization of contents preserved in an external storage device capable of coping with a plurality of content reproduction devices.SOLUTION: The information processor comprises: external storage devices 14 and 15 for storing storage medium identification information including a vendor ID, a product ID and a serial number intrinsic to a device and content encrypted data; a nonvolatile storage device 7 for storing authentication information for decrypting the content encrypted data and one or more pieces of device identification information; and a central processing unit 5 for comparing the storage medium identification information read from the external storage devices 14 and 15 with the one or more pieces of device identification information stored in the nonvolatile storage device 7, and on condition that the vendor ID and the product ID match and number information of a prescribed digit position in the serial number matches, decrypting the content encrypted data stored in the external storage device 15 by using the authentication information stored in the nonvolatile storage device 7.

Description

  The present invention relates to a technology for protecting content stored in an insertable / removable storage medium, and relates to an information processing apparatus and a digital photo frame that invalidate unauthorized devices and unauthorized storage media.

  As for this type of information processing apparatus, content data such as video data and audio data is recorded on a hard disk drive HDD as a storage medium, as in a digital broadcast recording / reproducing apparatus described in Patent Document 1, for example. When reproducing, an encryption key and a decryption key are used by using a serial number of the HDD, a secure ID held by a secure IC fixedly provided in the recording / reproducing device, and a card ID of an IC card as an external storage device. The content data is encrypted and decrypted by using the encryption key and the decryption key, and the content data is completely reproduced and output from the HDD only by the recording / reproducing apparatus that recorded the content data. ing.

  Further, for example, as in the information processing apparatus described in Patent Document 2, device information of key information uniquely or uniformly assigned to each device or each storage medium is stored in each of a plurality of devices or storage media. The content is encrypted using a plurality of encrypted media keys encrypted with the plurality of different device keys, and mutual authentication is performed between the device and the storage medium, thereby authenticating the unauthorized device. Some are not known.

JP 2005-174388 A JP 2011-30275 A

  In the above-described Patent Documents 1 and 2, since the content data encrypted from the storage medium is reproduced and output only by the recording / reproducing apparatus that records the content data on the storage medium, When copying encrypted encrypted data to multiple storage media and distributing the storage media to multiple users, mutual authentication using the identification number of the device owned by the user and the identification number of the distributed storage medium Since the decryption of the content encrypted data by is prevented, a plurality of users cannot view the legitimate content.

  In order to decrypt such content-encrypted content data, content reproduction equipment and a CPRM (Content Protection for Recordable Media) technology for preventing unauthorized copying implemented in digital broadcasts, DVDs, SD cards, etc. It is preferable to decrypt the content encrypted data after performing CPRM-compatible mutual authentication with the storage medium, and reproduce and output the regular content data. By connecting the medium to a personal computer and using CPRM release software, it is highly possible to specify the key ring information recorded on the storage medium, the media ID, and the encryption key stored in the authentication area. Unauthorized acts represented by secondary use such as copying the content data by releasing the applied CPRM It can not be stopped.

  The present invention has been made in view of the above problems, and provides an information processing apparatus that effectively prevents secondary use of content stored in an external storage device that can support a plurality of content playback devices. The purpose is to do.

According to the present invention, the above problem is solved as follows.
(1) External storage device for storing storage medium identification information including content-specific vendor ID, product ID, serial number and content encrypted data, authentication information for decrypting the encrypted data, and one or more device identifications A non-volatile storage device for storing information, the storage medium identification information read from the external storage device and one or more device identification information stored in the non-volatile storage device, and comparing the vendor ID and the product Using the authentication information stored in the non-volatile storage device, the encrypted data stored in the external storage device is used on condition that the IDs match and the number information at the predetermined digit positions in the serial number match. An information processing apparatus including a central processing unit for decoding is provided.

  With such a configuration, even if the personal computer and the external storage device are connected and the external storage device is analyzed using the CPRM release software, the key information for decrypting the content encrypted data is stored in the external storage device. Since it does not exist, the decryption of the content encrypted data can be prevented, and secondary use of the content stored in the external storage device can be effectively prevented.

(2) In the above item (1), when the central processing unit analyzes the content data decoded using the authentication information and obtains a result of successful decoding that matches a predetermined compression-encoded file format, The data is stored in the main storage device.

  With this configuration, the content stored in the external storage device is stored in the main storage device because only the content encrypted data successfully decrypted using the mutual authentication and authentication information between the information processing device and the external storage device is stored in the main storage device. Can be effectively prevented.

(3) In the above item (1) or (2), the central processing unit is a file that analyzes the attribute information of the file stored in the external storage device and stores the content encrypted data in accordance with the file identifier information or the file format. If it is determined, the content encrypted data is received and decrypted.

  With this configuration, the central processing unit determines the data that prevents secondary use of content and the data that permits secondary use of content by analyzing file attribute information, and does not require copyright protection. It is possible to reduce the load on the central processing unit by omitting the mutual authentication and decryption processing sequence for simple content.

(4) In any one of the above items (1) to (3), the non-volatile storage device identifies information on all digits of the vendor ID and product ID of the external storage device and number information at a predetermined digit position in the serial number. Possible device identification information is stored.

  With such a configuration, the central processing unit can identify information on all digits of the vendor ID and product ID shared by a plurality of external storage devices and number information at a predetermined digit position in the serial number unique to the device. Therefore, the content supplier can distribute a plurality of external storage devices storing the same content to a plurality of users.

(5) In any one of the above items (1) to (4), the number information at a predetermined digit position in the serial number stored in the non-volatile storage device is specified, and the content type of the content encrypted data stored in the external storage device is specified It is assumed to include a multi-digit number sequence.

  With such a configuration, the reproducible content type can be specified by the number information at a predetermined digit position in the serial number.

(6) In any one of the above items (1) to (5), the number information at a predetermined digit position in the serial number stored in the external storage device is common to the other external storage devices.

  With such a configuration, a content supplier can store the same type of content in a plurality of external storage devices and supply the external storage device to a plurality of users.

(7) In any of the above items (1) to (6), an information processing device is provided, and content data received from the information processing device is converted into an image signal via a display control unit and displayed on the display device. Make it possible.

  With such a configuration, only content data for which decryption of content encrypted data stored in the external storage device has been successfully performed can be played back.

(8) In the above item (7), the content data received from the information processing apparatus is converted into an audio signal via the reproduction control unit so as to be output to a speaker.

  With such a configuration, it is possible to reproduce audio only from content data that has been successfully decrypted from the content encrypted data stored in the external storage device.

  According to the present invention, it is possible to provide an information processing apparatus that effectively prevents secondary use of content stored in an external storage device that can support a plurality of content playback devices.

It is a block diagram of the information processor of the present invention. It is a flowchart which shows the operation | movement sequence of the information processing apparatus of this invention. 1 is an external perspective view of a digital photo frame of the present invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As an embodiment, an example in which an information processing apparatus according to the present invention is applied to a digital photo frame will be described.

  As shown in FIG. 1, an information processing apparatus 1 includes a system controller 2 that controls the entire apparatus, a main storage device 3 that provides a work area for the system controller 2 and temporarily stores data and task programs, and a system controller. 2 and a bus 4 for connecting the main storage device 3 to each other.

  The main storage device 3 can use a dynamic random access memory DRAM or a static random access memory SRAM, and holds data and a task program during a period when power is supplied.

  The system controller 2 includes a central processing unit 5 (Central Processing Unit), a digital signal processing device 6 that decompresses compression-encoded content data, a non-volatile storage device 7 that stores various data and application programs, An internal bus 4a for connecting the central processing unit 5, the digital signal processing unit 6 and the nonvolatile storage device is provided. The system controller 2 may integrate the central processing unit 5, the digital signal processing unit 6, and the non-volatile storage unit 7 on a single semiconductor substrate, and each unit 5, 6, and 7 is an individual semiconductor unit. May be combined.

  The nonvolatile storage device 7 can use an electrically rewritable flash memory or a read-only programmable memory that can retain data and programs stored therein even after power supply is terminated.

  The bus 4 includes an IP communication unit 8 that performs Internet protocol communication with the outside by wired or wireless, a display control unit 9 that converts digital image data of a moving image or a still image into an analog signal, and digital audio data into an analog audio signal. A playback control unit 10 for conversion, a user operation reception unit 11 for a user to specify a content playback order, an image playback speed, and the like, a USB interface 12 for transmitting and receiving USB (Universal Serial Bus) device data, and an SD (Secure Digital) is connected to an SD card interface 13 for transmitting / receiving data of the card.

  The USB interface 12 is connected to the USB flash memory 14 as an external storage device that can be attached to and detached from the information processing apparatus 1, and transmits and receives data to and from the USB flash memory 14. The USB flash memory 14 includes a controller having a CPU, a ROM, and a RAM (not shown), and a flash memory that stores content encrypted data, non-encrypted data, and various programs.

  The SD card interface 13 is connected to an SD card memory 15 as an external storage device that can be attached to and detached from the information processing apparatus 1, and transmits and receives data to and from the SD card memory 15. The SD card memory 15 includes a controller having a CPU, a ROM, and a RAM (not shown), and a flash memory that stores content encrypted data, non-encrypted data, and various programs.

  The display control unit 9 receives moving image or still image digital data from the bus 4, converts the digital data into an image signal, and outputs the image signal to a display device 16 such as a liquid crystal panel or a plasma panel.

  The reproduction control unit 10 receives audio digital data from the bus 4, converts the digital data into an audio signal, and outputs the audio signal to the speaker 17.

  The information processing apparatus 1 according to the present embodiment is provided with a nonvolatile storage device 7. The nonvolatile storage device 7 stores authentication information for decrypting content encrypted data obtained by encrypting content data, device identification information used for mutual authentication, and software programs for various applications.

  Since the non-volatile storage device 7 is provided in the system controller 2, it has high hardware security and maintains confidentiality of authentication information and device identification information. In the state of being incorporated in the device 1, it is very difficult to read and acquire authentication information and device identification information from the outside.

  Further, if the nonvolatile storage device 7 is detached from the information processing device 1 or separated from the circuit of the information processing device 1 and the analysis is performed, the work becomes very troublesome. It is also technically difficult to obtain identification information.

  The nonvolatile storage device 7 stores, for example, one device identification information corresponding to the USB flash memory 14 or the SD card memory 15 and can be applied to a digital photo frame connected to one of the memories. Also, a plurality of identification information corresponding to the USB flash memory 14 and the SD card memory 15 can be stored and applied to a digital photo frame connected to both memories.

  The authentication information stored in the nonvolatile storage device 7 is input or stored in a computer (not shown) used by the content supplier, for example, and the USB flash memory 14 or SD as an external storage device before being supplied to the user. It is a sequence of a predetermined number of digits used to encrypt content data to be stored in the card memory 15. For example, the content supplier can use it as authentication information for arbitrarily designating a 6-digit password combining alphanumeric characters.

  Here, the content data is digital information obtained by digitally compression-coding video data of still images or moving images or audio data of music or audio. For example, it is generated by using a compression coding technique such as MPEG coding, JPEG coding, GIF coding, PING coding or the like. The information processing apparatus 1 according to the present embodiment can play back content corresponding to content including an image and audio data, content including only an image, and content including only audio data.

  The authentication information can be a password arbitrarily specified by the content supplier, but instead of this password, the secret key information generated by the computer used by the content supplier (not shown) using a random number generation algorithm The content encrypted data obtained by encrypting the content data can be stored in the USB flash memory 14 or the SD card memory 15.

  The authentication information is information shared by a computer (not shown) used by the content supplier and the plurality of information processing devices 1 and is stored in advance in the nonvolatile storage device 7 of the information processing device 1 to produce a digital photo frame product. It can be supplied in form.

  The device identification information stored in the nonvolatile storage device 7 includes, for example, device-specific vendor ID, product ID, and number information of a predetermined digit position in the serial number of the USB flash memory 14 and the SD card memory 15. It is a hexadecimal number with a predetermined number of digits. In this embodiment, for example, 12-digit device identification information is obtained by selecting any one of the upper 4 digits, middle 4 digits, and lower 4 digits of the serial number as number information at a predetermined digit position. be able to.

  The USB flash memory 14 stores system information that can be read by the information processing apparatus 1. For example, when the system information of the USB flash memory 14 is read as "USB \ VID_xxxx & PID_xxxx \ xxxxxxxxxxxxx", the vendor ID is , The hexadecimal number of the subsequent four digits “xxxx” of the character string “VID_”, the product ID is the hexadecimal number of the subsequent four digits “xxxx” of the character string “& PID_”, and the serial number is the character “¥” A device-specific number can be specified by the hexadecimal number of the subsequent 19 digits “xxx...”. This serial number is stored in the USB flash memory 14 as hardware information.

  System information that can be read by the information processing apparatus 1 is stored in the SD card memory 15. For example, by reading the 128-bit contents of the CID register (Card identification number) of the SD card memory 15, a 4-digit vendor ID is stored. A device-specific number can be specified by a hexadecimal number sequence of a 4-digit product ID and a 19-digit serial number. This serial number is stored in the SD card memory 15.

  The manufacturer of the memory product uses a serial number corresponding to the serial number in the lower 7 digits of the serial number in the USB flash memory 14 and assigns a number 268 million unique to the device to the USB flash memory. 14 can be manufactured. Here, for example, when the content supplier designates, as number information, four-digit alphanumeric characters in the upper digit position from the lower seven digits of the serial number, the USB flash memory 14 having the same vendor ID and product ID is stored. By using it, about 65,000 kinds of contents can be supplied, and up to about 268 million of the same kind of contents corresponding to the same number information can be supplied.

  Further, by updating the 4-digit product ID of the USB flash memory 14, additional content can be supplied. Furthermore, as with the USB flash memory 14, the SD card memory 15 supplies approximately 65,000 types of contents when a 4-digit alphanumeric character is designated as the number information from a predetermined digit position of the serial number. Up to about 268 million of the same kind of content corresponding to the same number information.

  Further, the USB flash memory 14 and the SD card memory 15 may be bundled with the information processing apparatus 1 and supplied to the user in the form of a digital photo frame, and content may be supplied independently of the information processing apparatus 1. You may supply separately to several users from a person.

  Since the authentication information is stored in the information processing apparatus 1 used by a legitimate user, for example, a malicious user removes the USB flash memory 14 or the SD card memory 15 from the information processing apparatus 1 and is stored therein. Even if the storage medium identification information and the CPRM information for preventing unauthorized copying are read out, the authentication information and the information source for generating the authentication information are not included in them, so that it is technically difficult to decrypt the content encrypted data. Yes, secondary use of content can be effectively prevented.

  The software program stored in the nonvolatile storage device 7 includes, for example, a content reproduction program executed by the central processing unit 5, a USB flash memory 14 as an external storage device, and a mutual authentication program with the SD card memory 15, and content A decryption program that decrypts the encrypted data, an analysis program that determines whether the content data has been successfully decrypted, and various decompression programs that are executed by the digital signal processing device 6 are included.

  As shown in FIG. 2, the information processing apparatus 1 executes a content reproduction operation including a decryption process of content encrypted data. The operation sequence shown in this figure is obtained when the central processing unit 5 in the system controller 2 executes a program stored in the nonvolatile storage device 7.

  Processing starts (starts) with the USB flash memory 14 or the SD card memory 15 as an external storage device connected to the information processing apparatus 1 of the present embodiment, but the SD card memory 15 is used as an external storage device. The case where it applies is illustrated.

  In step S1, the central processing unit 5 selects a file stored in the SD card memory 15, acquires the identifier and file format of this file, and determines whether the data specified by the file is content encrypted data. To do. When an affirmative determination result (YES) that is content encrypted data is output, the process branches to step S2.

  In step S <b> 2, the central processing unit 5 transmits a storage medium identification information transmission request command to the SD card memory 15 and receives the storage medium identification information from the SD card memory 15. This storage medium identification information is 128-bit binary data including the vendor ID, product ID, and serial number stored in the CID register of the SD card memory 15.

  In addition, the central processing unit 5 stores the received storage medium identification information in a predetermined area of the main storage device 3 and shifts the processing to step 4. However, the present invention is not limited to the mode in which the storage medium identification information is stored in the main storage device 3. Instead of the main storage device 3, the storage medium identification information is temporarily stored in an internal register of the central processing unit 5. May be.

  In step S3, the central processing unit 5 receives the content encrypted data corresponding to the selected file from the SD card memory 15, temporarily stores it in a predetermined area of the main storage device 3, and shifts the processing to step 5.

  In step S4, the central processing unit 5 compares the storage medium identification information stored in the main storage device 3 with one or a plurality of device identification information stored in the nonvolatile storage device 7, and the vendor ID and product described above. If a positive determination result (YES) of successful authentication is output on condition that the IDs match and the number information at the predetermined digit positions in the serial number match, the process branches to step 5.

  The one or more device identification information is number information at a predetermined digit position in the vendor ID, product ID, and serial number stored in the USB flash memory 14 and the SD card memory 15 that may be supplied by the content supplier. These are stored in the nonvolatile storage device 7.

  Thereby, a user who owns a plurality of information processing devices 1 has the same device identification information even when the information processing devices 1 are installed in a plurality of places such as a living room, a living room, and a passage. The content can be reproduced simply by reconnecting the SD card memory 15 to the information processing apparatus 1.

  In addition, when a user who owns a single information processing apparatus 1 receives a new SD card memory 15 from a content supplier, the SD card memory 15 stores predetermined storage medium identification information. Since it is stored, the content can be reproduced from the new SD card memory 15 without updating the storage content of the nonvolatile storage device 7 in the information processing device 1.

  In step S5, the central processing unit 5 decrypts the content encrypted data temporarily stored in the main storage device 3 into content data using the authentication information stored in the nonvolatile storage device 7, and the content data is Store in the main memory 3. When this decoding and storing process is completed, the process proceeds to step 6.

  The present invention is not limited to the mode in which the content encrypted data temporarily stored in the main storage device 3 in step S3 is decrypted by the central processing unit 5, but the processing in step S3 and the processing in step S5 are combined. You can also. That is, the central processing unit 5 reads the content encrypted data stored in the SD card memory 15 as an external storage device, and decrypts the content encrypted data into content data using the authentication information stored in the nonvolatile storage device 7. The content data may be stored in the main storage device 3. Thereby, there is no need to store the content encrypted data in the main storage device 3, and the storage area of the main storage device 3 can be used effectively.

  In step S6, the central processing unit 5 determines whether the file format of the content data stored in the main storage device 3 is decoded into a predetermined compression-encoded file and outputs a positive determination result (YES). Is branched to step 7.

  In step S 7, the central processing unit 5 decompresses the content data stored in the main storage device 3, and displays the generated digital image data and digital audio data via the bus 4 through the display control unit 9 and the reproduction control unit 10. To output the image and audio content from the display device 16 and the speaker 17, and the processing can be terminated.

  The present invention is not limited to the mode in which the content data stored in the main storage device 3 by the central processing unit 5 in step S7 is decompressed. Instead of the central processing unit 5, the digital signal processing device 6 is replaced with the main storage device. The content data stored in 3 is decompressed, the compressed and encoded content data is decompressed into digital image data and digital audio data, and the digital data is displayed on the display controller 9 and the playback controller 10 via the bus 4. Can also be output. This is effective in that the central processing unit 5 can receive the next content encrypted data from the SD card memory 15 as an external storage device while the digital signal processing device is executing the content data decompression processing. .

  Further, when the central processing unit 5 outputs a negative determination result (NO) that the data stored in the SD card memory 15 is not the content encrypted data in step S1 described above, the central processing unit 5 branches the process to step S8. . For example, an object that is a negative determination result (NO) corresponds to compression-encoded content data supplied from a content supplier or literary work data taken by a user with a digital camera.

  In step S8, the central processing unit 5 receives the data stored in the SD card memory 15 and performs a decompression process. The decompressed content data can be transmitted to the display control unit 9 and the reproduction control unit 10 via the bus 4 in an expanded state, and output to the display device 16 and the speaker 17.

  Furthermore, when the central processing unit 5 outputs a negative determination result (NO) in steps S4 and S6 described above, the central processing unit 5 performs a reproduction process through an error process that causes the display device to display such as “file inconsistency”, for example. Terminate and act to perform the next task. In other words, if the authentication information based on the identification information is unsuccessful or the content data is unsuccessful, the central processing unit 5 executes an error process and continues the playback sequence that has been operated and specified by the user from the user operation receiving unit 11. For example, the central processing unit 5 executes a reproduction program stored in the nonvolatile storage device 7 in accordance with a display mode such as repeat reproduction or random reproduction included in the digital photo frame, and from the USB flash memory 14 or the SD card memory 15, The next content data or content encrypted data can be picked up and read and played until the information processing apparatus 1 is turned off.

  The information processing apparatus 1 described above exemplifies an embodiment in which the content supplier stores content encrypted data in the USB flash memory 14 or the SD card memory 15 as an external storage device using a computer (not shown). However, the present invention is not limited to this aspect. For example, content encrypted data received via the IP communication unit 8 in the information processing apparatus 1 is stored in the USB flash memory 14 or the SD card memory 15. There is also.

  In this case, for example, a SIM card (Subscriber Identity Module Card) is mounted on the IP communication unit 8, and a unique ID number for identifying a telephone number used in the mobile phone or the IP communication unit 8 is allocated. ing.

  A cellular phone communication company associates an ID number of a SIM card with an Internet protocol address (hereinafter abbreviated as “IP address”) via its own server, and uses various IP addresses as destinations. The information is transferred to the IP communication unit 8 on which the SIM card is mounted.

  The content supplier transmits the content encrypted data storing the content from the server managed by the content supplier to the Internet communication network, and transmits the encrypted data to the IP communication unit 8 via the server of the mobile phone communication company. The content encrypted data can be stored in the USB flash memory 14 or the SD card memory 15 in the information processing apparatus 1 used by a legitimate user.

  The IP communication unit 8 can also receive content encrypted data from a server that is equipped with a wireless LAN function and managed by the content supplier via the Internet communication network.

  Since the content encrypted data is encrypted by the computer used by the content supplier as described above, it is difficult for a third party to decrypt the content data even if it is transmitted to the Internet communication network. Secondary use of content can be prevented.

  Furthermore, the information processing apparatus 1 of the present invention is not limited to the above embodiment. For example, content encrypted data can be received from a server managed by the content supplier via the Internet communication network using a personal computer. This content encrypted data is stored in the storage area of the hard disk drive of the personal computer.

  The user connects the USB flash memory 14 or the SD card memory 15 to the personal computer, moves or copies the content encryption data from the hard disk, removes the USB flash memory 14 or the SD card memory 15 from the personal computer, and performs the information processing apparatus. 1 can be reconnected to reproduce the content encrypted data.

  As shown in FIG. 3, the digital photo frame has a casing 18 made of a horizontally long cube, the display device 16 is disposed on the front surface of the casing 18, and the speaker cover that covers the speaker 17 on the upper surface of the casing 18. 17a and the user operation receiving unit 11 are arranged, and a power switch 19 and an opening for inserting the SD card memory 15 and an opening for inserting the USB flash memory 14 are provided on the right side surface of the housing 18. The illustrated digital photo frame corresponds to the USB flash memory 14 and the SD card memory 15 and can reproduce the content encrypted data stored in both memories on the display device 16 and the speaker 17.

  The user operation receiving unit 11 can use, for example, a single push button switch, and can select a digital photo frame playback mode in a toggle format by a user pressing operation. For example, the continuous playback mode is selected in response to the first press operation, the random playback mode is selected in response to the second press operation, and the audio volume adjustment mode is selected by a long press operation for a predetermined period. can do.

DESCRIPTION OF SYMBOLS 1 Information processing apparatus 2 System controller 3 Main storage apparatus 4 Bus 5 Central processing unit 6 Digital signal processing apparatus 7 Non-volatile storage apparatus 8 IP communication part 9 Display control part 10 Playback control part 11 User operation reception part 12 USB interface 13 SD card Interface 14 USB flash memory 15 SD card memory 16 Display device 17 Speaker 17a Speaker cover 18 Housing 19 Power switch

Claims (8)

An external storage device for storing storage medium identification information including device-specific vendor ID, product ID, serial number and content encrypted data;
A non-volatile storage device that stores authentication information for decrypting the content-encrypted data and one or more device identification information;
Compare the storage medium identification information read from the external storage device with one or more device identification information stored in the nonvolatile storage device, the vendor ID and the product ID match, and the serial number A central processing unit that decrypts the content encrypted data stored in the external storage device using authentication information stored in the non-volatile storage device on condition that the number information at a predetermined digit position matches. An information processing apparatus characterized by the above.   The central processing unit analyzes the content data decoded using the authentication information, and stores the content data in a main storage device when obtaining a result of successful decoding that matches a predetermined compression-encoded file format. 1. An information processing apparatus according to 1.   When the central processing unit analyzes the attribute information of the file stored in the external storage device and determines that the file stores the content encrypted data according to the file identifier information or the file format, the central processing unit receives and decrypts the content encrypted data. The information processing apparatus according to claim 1 or 2.   The nonvolatile storage device stores device identification information capable of identifying information on all digits of the vendor ID and product ID of the external storage device and number information at a predetermined digit position in the serial number. The information processing apparatus described.   5. The number information of a predetermined digit position in the serial number stored in the non-volatile storage device includes a multiple-digit number sequence that specifies the content type of the content encrypted data stored in the external storage device. Information processing device.   6. The information processing apparatus according to claim 1, wherein number information at a predetermined digit position in the serial number stored in the external storage device is shared with a plurality of other external storage devices.   The information processing device according to claim 1 is provided, and content data received from the information processing device is converted into an image signal via a display control unit and can be displayed on the display device. Digital photo frame.   8. The digital photo frame according to claim 7, wherein the content data received from the information processing apparatus can be converted into an audio signal via the reproduction control unit and output to a speaker.

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