摘要:
A conventional AV data receiving device switches to a key for distribution to an outdoor device when a network environment is switched to an outdoor network environment, thus resulting in high key switching frequency. In view of this, an AV data receiving device according to the present invention determines, after switching the network environment from indoors to outdoors as a result of moving the AV data receiving device, whether or not key switching should be performed, before a command for restricting a hop count on a route from an AV data transmission device located indoors is transmitted, and performs authentication and key exchange processing for outdoor device distribution, so as to switch to the key for outdoor device distribution.
摘要:
A data transmission apparatus, a data reception apparatus, and a data transfer system prevent a case where same usable data is present in plural apparatuses at the same time and can certainly move data, in MOVE processing of the data between the data transmission apparatus and the data reception apparatus. The data transmission apparatus includes a synchronous control unit synchronizing a timing of (i) deleting or invalidating, in the data transmission apparatus, move-target data and (ii) decrypting, in the data reception apparatus, the move-target data that has been encrypted. With this, it becomes possible to prevent a case where the same usable data is present in plural apparatuses at the same time.
摘要:
An AV data transmission apparatus comprising: an encryption unit which encrypts AV data; an AV data transmission unit which transmits the encrypted AV data; a cipher-type-information switching unit which switches cipher type information indicating a cipher scheme used for the AV data, to other cipher type information; and a cipher-type-information transmission unit which transmits cipher type information. When transmitting AV data which is prohibited from being used in a reception apparatus that does not support new usage control information, the AV data transmission apparatus assigns different cipher type information to be notified to the reception apparatus, so that even the reception apparatus which cannot recognize the new usage control information can recognize that being unable to perform decryption is due to new encryption performed by the AV data transmission apparatus.
摘要:
A source device includes: a storage unit which stores the file; a receiving unit which receives, from a sink device, a file acquisition request; a transmitting unit which transmits, to the sink device, data within a range specified in the file acquisition request received by the receiving unit, from among the file stored in the storage unit; a limitation unit which deletes or makes unusable data within the range transmitted by the transmitting unit, from among the file stored in the storage unit; and a notification unit which notifies the sink device of a usable range which is a range in which the file is neither deleted nor made unusable by the limitation unit, from among the file stored in the storage unit.
摘要:
A data recording apparatus (101) in the present invention includes: a data recording unit (13) that records and holds AV data supported by a copyright protection system permitting multiple times dubbing; a media recording unit (17) that performs dubbing or moving of the AV data between storage medium and the data recording unit (13), or between storage medium and different storage medium; a dubbing management information management unit (14) that manages dubbing management information for the AV data; and a media determination unit (18) that determines whether the storage medium is rewritable or non-rewritable based on the media type of storage medium. When the media recording unit (17) performs moving of the AV data from the data recording unit (13) to the storage medium, the dubbing management information management unit (14) updates the dubbing management information management unit (14) corresponding to the AV data according to the determination result.
摘要:
A conventional AV data receiving device switches to a key for distribution to an outdoor device when a network environment is switched to an outdoor network environment, thus resulting in high key switching frequency. In view of this, an AV data receiving device according to the present invention determines, after switching the network environment from indoors to outdoors as a result of moving the AV data receiving device, whether or not key switching should be performed, before a command for restricting a hop count on a route from an AV data transmission device located indoors is transmitted, and performs authentication and key exchange processing for outdoor device distribution, so as to switch to the key for outdoor device distribution.
摘要:
A portable terminal (2) is a data transmission and reception control apparatus. A Proximity confirmation unit (23) confirms a first proximity condition of proximity to the data transmission apparatus. A proximity apparatus authentication and registration processing unit (21) registers the portable terminal (2) into the data transmission apparatus when authentication in conjunction with the data transmission apparatus is successful, and the first proximity condition is satisfied. A proximity confirmation unit (27) confirms a second proximity condition of proximity to the data reception apparatus. A registration starting and authentication processing unit (26) obtains identification information of the data reception apparatus when authentication in conjunction with the data reception apparatus is successful, and when the second proximity condition is satisfied. An authentication and registration processing unit (22) registers the identification information of the data reception apparatus into the data transmission apparatus when authentication in conjunction with the data transmission apparatus is successful.
摘要:
A data transmission and reception system and the like are provided, which are capable of preventing: unauthorized copying between a server and a client; and unnecessary use limit when a copyright constraint is conformed. A server generates and manages overall use permission information indicating that the overall data accumulated in the server can be used and distributes the overall use permission information together with copied data to the client determined to exist within a private use range. The client manages the overall use permission information and the data received from the server in such a manner associated with each other and enables use of the data received from the server only when the overall use permission information is valid. When the client moves only within the private use range, the server continuously manages the overall use permission information so as to enables use of the copied data. Meanwhile, use of the copied data in the client which has moved out of the private use range is inhibited.
摘要:
Provided is a data transmission apparatus, a data reception apparatus, and a data transfer system which can prevent a case where the same usable data is present in plural apparatuses at the same time and can certainly the move data, in MOVE processing of the data between the data transmission apparatus and the data reception apparatus. The data transmission apparatus (101) includes a synchronous control unit (405) that synchronizes a timing of deleting or invalidating, in the data transmission apparatus (101), move-target data and a timing of decrypting, in the data reception apparatus (102), the move-target data that has been encrypted. With this, it becomes possible to prevent a case where the same usable data is present in plural apparatuses at the same time.
摘要:
A data transmission and reception system and the like are provided, which are capable of preventing: unauthorized copying between a server and a client; and unnecessary use limit when a copyright constraint is conformed. A server generates and manages overall use permission information indicating that the overall data accumulated in the server can be used and distributes the overall use permission information together with copied data to the client determined to exist within a private use range. The client manages the overall use permission information and the data received from the server in such a manner associated with each other and enables use of the data received from the server only when the overall use permission information is valid. When the client moves only within the private use range, the server continuously manages the overall use permission information so as to enables use of the copied data. Meanwhile, use of the copied data in the client which has moved out of the private use range is inhibited.