Patent application number | Description | Published |
20090198713 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - When stored stream data is deleted/edited, the packet sequence completely included in a deletion range is deleted from the stream data, and the stream data is segmented into first stream data before the start point of the deletion range and second stream data after the end point of the deletion range. First and second stream management data corresponding to the first and second stream data are generated. The index value of the packet including the start point of the deletion range is written in the header of the first stream management data. The index value of the packet including the end point of the deletion range is written in the header of the second stream management data. In addition, an index base value for correcting the index value is written in the header of the second stream management data. | 08-06-2009 |
20090208003 | Authentication Method, Host Computer and Recording Medium - According to one embodiment, a host computer updates the media key block MKB in a first updatable memory device in the case where the version number of the media key block MKB read from a recording medium is newer than that of the media key block MKB in the first updatable memory device. The host computer generates a medium unique key Kmu based on a media key Km calculated from the media key block MKB read from the recording medium and a media ID read from the recording medium. The host computer executes the authentication and key exchange AKE process with the recording medium based on the medium unique key Kmu. | 08-20-2009 |
20100017626 | INFORMATION PROCESSING APPARATUS, AUTHENTICATION METHOD, AND STORAGE MEDIUM - According to one embodiment, a storage medium comprises an encrypted content, key management information which is updated whenever necessary and includes a media key block including encrypted media keys obtained by encrypting a media key which is a base of an authentication key used for mutual authentication with another apparatus by using different device keys, and first and second application keys which encrypt the title keys for each application of the content and are alternately updated and encrypted when the key management information is updated. | 01-21-2010 |
20100250934 | CONTENT PROTECTION DEVICE AND CONTENT PROTECTION METHOD - According to one embodiment, a content protection device includes a writing module configured to write protection information into file management information item in order to protect a content which is specified to be protected, wherein the writing module is configured to write the protection information corresponding to sectors which stores content key management information file includes content key link information item includes content key position information item of encrypted content key corresponding to content which is specified to be protected, or to write protection information corresponding to at least part of a sectors which stores content key management file includes encrypted content key corresponding to content which is specified to be protected. | 09-30-2010 |
20100268953 | RECORDING DEVICE, AND CONTENT-DATA PLAYBACK SYSTEM - A recording device configured to store content data in an encrypted manner, the recording device comprises a memory unit which stores various data, and a controller which controls the memory unit. The controller possesses a controller key and unique identification information, and is configured to generate a controller-unique key unique for each controller in accordance with the controller key and the identification information. The memory unit stores an MKB generated by encrypting a medium key with a device key set that is a collection of a plurality of device keys, an encrypted device key set generated by encrypting the device key set with the controller-unique key, and a device-key-set index which uniquely identifies the device key set. The controller comprises a decryption unit which obtains a device key set by decrypting the encrypted device key set with the controller-unique key, an ID generating unit which generates a medium ID from the identification information and the device-key-set index, and an authentication unit which executes an authentication process with an exterior in accordance with the device key set, the medium ID and the MKB. | 10-21-2010 |
20110091032 | METHOD AND APPARATUS FOR INFORMATION REPRODUCTION - According to one embodiment, a content recording apparatus including, a key preparing section configured to prepare a key to encrypt an acquired stream, a file preparing section configured to add identification information to the acquired stream to prepare a file, a hash calculating section configured to calculate a hash value concerning the identification information added to the stream by the file preparing section, a key file preparing section configured to integrate the hash value calculated by the hash calculating section and the key prepared by the key preparing section to prepare a key file, and a writing section configured to write the key file prepared by the key file preparing section in the protected area of a recording medium. | 04-21-2011 |
20120272065 | Authentication Method, Host Computer and Recording Medium - According to one embodiment, a host computer updates the media key block MKB in a first updatable memory device in the case where the version number of the media key block MKB read from a recording medium is newer than that of the media key block MKB in the first updatable memory device. The host computer generates a medium unique key Kmu based on a media key Km calculated from the media key block MKB read from the recording medium and a media ID read from the recording medium. The host computer executes the authentication and key exchange AKE process with the recording medium based on the medium unique key Kmu. | 10-25-2012 |
20130060830 | REMOTE ACCESS SYSTEM, ELECTRONIC APPARATUS AND METHOD OF PROCESSING REMOTE ACCESS - According to one embodiment, an electronic apparatus includes a first module and a second module. The first module receives a remote command from another electronic apparatus and transmits a response to the remote command to the other electronic apparatus. The remote command includes command type information indicating a type of the local command. The second module issues one or more local commands including the local command to the storage device and transmits a first response from the storage device to the other electronic apparatus by storing the first response into a second response to the remote command, in accordance with a process specified by the command type information in the remote command. | 03-07-2013 |
20130061015 | ACCESS CONTROL APPARATUS AND ACCESS CONTROL SYSTEM - According to one embodiment, an access control apparatus includes a medium communication module configured to perform communication with a removable medium, a access module configured to perform access to the removable medium using the communication module, a wireless communication module configured to perform wireless communication with a external device, and to receive access request to the removable medium, and a controller configured to assign an access right to access the removable medium to one of the access module and the external device, the control module assigning the access right in response to a request of assignment of the access right, the request being transmitted from the external device or the access module. | 03-07-2013 |
20130326142 | ELECTRONIC DEVICE AND DATA TRANSFER METHOD - According to one embodiment, an electronic device including, a communication module configured to transfer data, a controller configured to transmit data to the second electronic device through the communication module, and configured to temporarily hold the data in a receiving buffer of the second electronic device, and a data controller configured to receive free space information of the receiving buffer of the second electronic device from the second electronic device through the communication module, and configured to prepare data, which is transmitted to each mobile medium from the communication module through the second electronic device, based on the received free space information. | 12-05-2013 |
20130326628 | ELECTRONIC DEVICE - According to one embodiment, an electronic device including, an acquiring module configured to acquire, via the external device, contents which are held in a contents holding medium and which are protected by the first contents protection scheme, and an output module configured to convert the acquired contents protected by the first contents protection scheme to the second contents protection scheme and then outputs the contents to the external device by the second contents protection scheme. | 12-05-2013 |
20140040634 | RECORDING DEVICE, AND CONTENT-DATA PLAYBACK SYSTEM - A recording device configured to store content data in an encrypted manner, the recording device comprises a memory unit which stores various data, and a controller which controls the memory unit. The controller possesses a controller key and unique identification information, and is configured to generate a controller-unique key unique for each controller in accordance with the controller key and the identification information. The memory unit stores an MKB generated by encrypting a medium key with a device key set that is a collection of a plurality of device keys, an encrypted device key set generated by encrypting the device key set with the controller-unique key, and a device-key-set index which uniquely identifies the device key set. | 02-06-2014 |
20140059273 | HOST APPARATUS AND MEMORY DEVICE - According to one embodiment, a host apparatus is capable of accessing memory device. The host apparatus includes application software, a dedicated file system, and an interface circuit. The application software issues, to a file system, a request for access to the memory device. The dedicated file system manages a memory area of the memory device in accordance with a method appropriate to a flash memory in response to the access request. The dedicated file system manages logical address spaces by predetermined unit areas, and sequentially writes data into one of reserved unit areas. The application software issues the access request to the dedicated file system without recognizing a size of the unit area. | 02-27-2014 |
20140337626 | CONTENT REPRODUCING DEVICE, CONTENT REPRODUCING METHOD, AND CONTENT REPRODUCING SYSTEM - According to one embodiment, a content reproducing device is provided with connection unit and reproducing unit. The connection unit connects a license server and removable medium to each other in such a manner that mutual authentication can be carried out between the license server and removable medium, and rights information can be downloaded from the license server to the removable medium. The reproducing unit carries out mutual authentication between itself and the removable medium and, when the authentication is successful, acquires rights information recorded on the removable medium to thereby decrypt the encrypted content item delivered by the content server on the basis of the rights information, and subject the decrypted content item to streaming reproduction. | 11-13-2014 |