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:
An AV data transmission apparatus includes 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, which is used to notify the reception apparatus, so that even the reception apparatus which cannot recognize the new usage control information can recognize its inability to perform decryption is due to new encryption performed by the AV data transmission apparatus.
摘要:
An AV data transmission apparatus having two or more output channels, the apparatus comprising: an encryption unit which encrypts AV data using an encryption key; an AV data transmission unit which transmits the encryption key and the encrypted AV data to AV data reception apparatuses from each output channel; an encryption key switching unit which switches an encryption key generation scheme to another one for the encryption key transmitted through a selected output channel; an output suspension unit which suspends output of the encrypted AV data transmitted through a selected output channel; and a control unit which causes (i) the output suspension unit to select an output channel and suspend the output of the encrypted AV data through the selected output channel, and then causes (ii) the encryption key switching unit to select the same output channel and switch the encryption key generation scheme to another one for the output channel.
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 an AV data transmission apparatus including two or more output channels, an encryption unit encrypting AV data using an encryption key, and an AV data transmission unit transmitting the encryption key and the encrypted AV data to AV data reception apparatuses from each output channel. The apparatus also includes an encryption key switching unit switching an encryption key generation scheme to another one for the encryption key transmitted through a selected output channel, an output suspension unit suspending output of the encrypted AV data transmitted through a selected output channel, and a control unit (i) causing the output suspension unit to select an output channel and suspend the output of the encrypted AV data through the selected output channel, and then (ii) causing the encryption key switching unit to select the same output channel and switch the encryption key generation scheme to another one for the output channel.
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 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 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.