Abstract: There is provided an electronic device capable of automatically unlocking a lock of an external storage device using a password without adding a function to the external storage device. An electronic device 100 includes a memory card connection unit 108 connecting a memory card 200 capable of being locked using the password, a password retention unit 101 retaining the password of the memory card 200, a lock state determination unit 106 determining whether or not the memory card 200 connected to the memory card connection unit 108 is in a locked state, and a setting cancellation unit 105 transmitting an unlocking signal for unlocking the locked state of the memory card 200 on the basis of the password when it is determined that the memory card 200 is in the locked state.

Abstract: An input-mode determination unit determines an input mode to be a graphic mode in the case where the number of sets of coordinates included in a coordinate sequence stored in the coordinate-sequence storage unit is smaller than a predetermined number and points represented by the coordinates are within a predetermined distance range, and otherwise, determines the input mode to be a curve mode. A line-to-draw sequence generation unit generates a line-to-draw sequence according to the input mode which the input-mode determination unit has determined to be.

Abstract: In a target apparatus which stores at least one piece of domain key information in a first area and a plurality of pieces of content key information each associated with any one of the domain key information in a second area, a method for generating data for detecting tampering of the content key information. The method comprises the steps of encrypting the content key information associated with one of the domain key information using a chain encryption technique; extracting data at predetermined positions in the encrypted content key information, concatenating the pieces of data extracted at the predetermined positions in the encrypted content key information to obtain concatenated data, performing a hash calculation with respect to the concatenated data to obtain a hash value, storing check values corresponding to the data at the predetermined positions in plain text, in the target apparatus, and storing the hash value in the target apparatus.

Abstract: In a target apparatus which stores at least one piece of domain key information in a first area and a plurality of pieces of content key information each associated with any one of the domain key information in a second area, a method for generating data for detecting tampering of the content key information. The method comprises the steps of encrypting the content key information associated with one of the domain key information using a chain encryption technique, extracting data at predetermined positions in the encrypted content key information, concatenating the pieces of data extracted at the predetermined positions in the encrypted content key information to obtain concatenated data, performing a hash calculation with respect to the concatenated data to obtain a hash value, storing check values corresponding to the data at the predetermined positions in plain text, in the target apparatus, and storing the hash value in the target apparatus.

Abstract: A data recording system 1 includes: a file generating part 3 for dividing digital data so as to generate a plurality of data files and recording the plurality of the data files sequentially into a recording medium 5; a management file judging part 6 for determining one management file for recording management information of the plurality of the data files; and a management information generating part 4 for recording the management information of the plurality of the data files into the determined management file. The management file judging part 6 determines the management file such that the number of the data files managed by the management file does not exceed a maximum data file number L (L is a natural number) that can be managed by the management file. Thereby, it is possible to record the plurality of the data files that are divided from the digital stream data and are recorded, such that the management of the plurality of the data files is easy.

Abstract: The invention presents an encrypted content playback equipment capable of decryption and playback of an encrypted content by using key information when a key medium storing the key information is not inserted, an encrypted content playback method, a program, and a recording medium for storing the program. An encrypted content playback equipment 100 obtains key information 1 for a key medium 120, and stores the key information 1 in a provisional-key storage memory 102 as provisional key 1a, and obtains provisional-key usage limitation information 2 for limiting the use of provisional key 1a from the key medium 120. The encrypted content playback equipment 100 judges whether the provisional key 1a is usable or not based on the provisional-key usage limitation information 2, and if usable, plays back an encrypted content 3 by using the provisional key 1a.

Abstract: A semiconductor recording medium stores attribute management information for managing various attribute information on a content (genre, composer, artist, album, title, etc.) for each item; and sort management information managing information on a sort order when information managed by the attribute management information is sorted by a predetermined procedure. The attribute management information contains character data indicating items to be managed and pointer information indicating link relationship between the attribute management information. The sort management information contains information on the sort order when all the entries in each of attribute management information are sorted by a predetermined procedure for each of attribute management information.

Abstract: A content search device calculates the number of valid encrypted contents as comparison objects contained in encrypted content databases and the number of valid decryption keys contained in decryption key databases. The database having the smaller number is decided to be a reference database. By successively reading out entries contained in the reference database, a combination of an encrypted content and a corresponding decryption key is searched.

Abstract: Provided is a method for performing high-speed search for a content key associated with encrypted content in the case of a key-separation-type content management method where content keys and their respective pieces of encrypted content are correlated by ID information and stored in different recording media. An external recording medium is used to store a plurality of content files that contain: their respective pieces of encrypted content that are encrypted with different encryption keys; and their respective content IDs, each being associated with a corresponding piece of the encryption content, and a semiconductor recording medium is used to store a list that contains: pieces of encryption key storage location information, each indicating where a corresponding one of the encryption keys is stored; and the content IDs, the list being sorted in accordance with the content IDs.

Abstract: A domain key is used to perform chaining decryption with respect to encrypted content key information (ST203-1), and first data is extracted (ST203-2). The extracted first data is compared with partial-check data (ST203-4). The first data as it is encrypted is extracted from the m pieces of encrypted content key information (ST203-6), and a predetermined operation is executed with respect to concatenated data including m extracted check values to generate second data (ST203-8). The second data is compared with whole-check data included in domain key information (ST203-11). If the first data matches the partial-check data (ST203-5) and the second data matches the whole-check data (ST203-12), it is determined that there is not tampering.

Abstract: A recording medium (100) for storing content that can be read and written by a host device stores a content key (a key that is used for encrypting content) (805a) encrypted in a first format, and a content key (805b) that is encrypted in a second format for content that is the same as the content related to the content key (805a) encrypted in the first format. The first format is, for example, a format used for distributed content, and the second format is a format used with local content.

Abstract: A recording/reproduction device 10 receives content broadcast from a content provision device 11. The recording/reproduction device 10 encrypts the received content using a device key, to generate first encrypted content. The recording/reproduction device 10 decrypts the first encrypted content to obtain the content, performs an image conversion on the obtained content to generate converted content, and encrypts the converted content using a medium key to generate second encrypted content. The recording/reproduction device 10 writes the second encrypted content, the medium key, and the device key to a portable medium 14. When the portable medium 14 is inserted in a mobile information terminal 15, the mobile information terminal 15 decrypts the second encrypted content using the medium key to obtain the converted content, and reproduces the converted content.

Abstract: A recording medium stores contents and contents keys to be used for encrypting the contents, in a plurality of storage formats. The storage formats include a storage format (a first format) for delivered contents acquired through a network, and a storage format (a second format) for local contents acquired by a method other than the delivery. The intrinsic storage formats of the contents to be stored in the recording medium are determined according to the kinds of the contents. The recording medium stores not only the contents and the contents keys but also original storage format information (an import flag) (851) which is information indicating the intrinsic storage formats of the contents. With reference to the original storage format information, a reproduction device selects a reproduction method in accordance with the intrinsic storage formats of the contents.

Abstract: A recording apparatus is provided for an SD memory card that has a plurality of EPUBxxx.KEY files recorded thereon, each file having a plurality of Key&Rule Entry areas, and an SD_EPUB.MMG file being read from the recording medium prior to the writing of data. A bitmap in SD_EPUB.MMG shows for each EPUBxxx.KEY file whether the EPUBxxx.KEY file has at least one Key&Rule Entry area not in use, or whether all the Key&Rule Entry areas are in use. Based on the bitmap in the read SD_EPUB.MMG file, the recording apparatus opens EPUB#u.KEY having an unused Key&Rule Entry area and writes data into the unused Key&Rule Entry area in the file. If all the Key&Rule Entry areas in EPUB#u.KEY become in use as a result of the writing of the data, the recording apparatus updates the bitmap in SD_EPUB.MMG.

Abstract: A semiconductor memory card (101) has a plurality of areas (105, 106) based on different file systems. An adapter (102) includes: an area switching part (110) which a user can operates, a determination part (109) for determining the operation; and a card controller (108) for issuing a switching command for switching the area to be used for the semiconductor memory card (101) in accordance with the judgment result. When the switching command is issued in response to input from the area switching part (110), the command is interpreted by an area selector (107) of the semiconductor memory card (101) so as to select an area.

Abstract: A power control section, which turns a video/audio recording apparatus ON or OFF, outputs power control information. A video recording control section, which starts or stops video recording, outputs video recording control information. A signal input section allows moving picture data to be input. Based on the power control information and the video recording control information, an attribute designation section generates attribute information, which is supplied to a recording section. The attribute information contains a program number used for the classification of moving picture files. Any number of moving picture files which may be recorded after the power is turned ON and before the power is turned OFF are assigned with the same program number. The recording section records on a recording medium the attribute information as well as moving picture files representing the moving picture data which has been input via the signal input section.

Abstract: An information recording medium (100) is a recording medium to/from which data can be written/read from a data processing apparatus. The recording medium includes a host interface (110) for communicating with the data processing apparatus, a data storage section (130) having a plurality of recording regions (#1, . . . ,#N) for storing data, and a region information storage section (124) for storing information on each recording region. The region information storage section (124) stores information about address attribute of each recording region of the data storage section (130). The information about the address attribute includes information indicating unit (byte or sector) of address specified on access to the recording region.

Abstract: While reproducing content stored in a recording medium, a user terminal as a data processing device downloads a related content as different content related to the reproduction target content from a content distribution server via a communication network. Immediately after the reproduction of the reproduction target content is completed, a notification prompting reproduction or purchase of the related content is provided. This permits immediate reproduction of the related content when the user purchases it, which reduces the user's waiting time, thus improving purchase motivation for the related content.

Abstract: The present invention relates to a data playback apparatus which efficiently performs playback or erasure of a program composed of video or audio which is stored in a memory card. A decoding unit for reading data from the memory to decode the read data retrieves an ID which matches a program ID designated by the user from a program file management data file, reads a movie data file in the folder of the designated program and decodes the read data, by referring to the relevant program information.

Abstract: In a target apparatus which stores at least one piece of domain key information in a first area and a plurality of pieces of content key information each associated with any one of the domain key information in a second area, a method for generating data for detecting tampering of the content key information. The method comprises the steps of encrypting the content key information associated with one of the domain key information using a chain encryption technique, extracting data at predetermined positions in the encrypted content key information, concatenating the pieces of data extracted at the predetermined positions in the encrypted content key information to obtain concatenated data, performing a hash calculation with respect to the concatenated data to obtain a hash value, storing check values corresponding to the data at the predetermined positions in plain text, in the target apparatus, and storing the hash value in the target apparatus.