Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Yasushi Ayaki

Kazunari Fujiwara

Takuya Nishimura

Naoshi Usuki

Yoshihiro Morioka

Tsukasa Yoshiura

Yuji Nagaishi

Takumi Tanabe

Satoshi Kondo

Hiroyuki Iitsuka

Toshiharu Koshino

Natsume Matsuzaki

Toshikazu Koudo

Hiroshi Mitani

Takeshi Shimamoto

Yoshiki Kuno

Toshiki Yamamura

Yuusaku Ohta

Kenji Muraki

Yoshitaka Yaguchi

Jiro Yamada

Junichi Komeno

Toshikazu Kodo

Hitoshi Ono

Yuuki Okamoto

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.

Data transmission apparatus, data reception apparatus, and data transmission and reception system

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.

File transmitting apparatus, file transmitting method, file receiving apparatus, file receiving method, and file transfer system

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.

AV data receiving device, AV data receiving method, and AV data transmission and receiving system

The conventional data transmitting/receiving system has problems: that a correct measurement cannot be performed because a measurement result is an addition of a verification processing time and a transmission time; that an authentication processing which is necessary for a transmission time measurement processing needs to be separately required; and that an unnecessary key exchange processing is executed. The transmission apparatus (a) shares authentication information with a request source which requests for transmission of content data, (b) transmits, to the request source, a measurement request generated using the authentication information, (c) receives, from the request source, a measurement response generated using the authentication information by the request source, as a response to the measurement request, (d) measures the period of time from the transmission of the measurement request to the reception of the measurement response, as a round trip time, (e) transmits, to the request source, a measurement preparation request for a preparation which is necessary for generating the measurement response, before the transmission of the measurement request, and (f) determines that the request source is an eligible device as the transmission destination of the content data, after the measurement of the round trip time, in the case where it is confirmed that the round trip time is less than or equal to a reference value, the measurement response is verified as a correct response, and the measurement request is verified as a correct request by the request source.

Communication apparatus

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.

AV data transmission apparatus and AV data transmission method

A recording and reproducing apparatus () includes: an AV recording medium () recording an AV data item; a transmitting and receiving unit () transmitting and receiving the item and information on the item to and from an other apparatus connected to the apparatus () via a network; a retrieving unit () retrieving AV data items that indicate a same program and are recorded on the AV recording medium and in the other apparatus; a comparing unit () comparing image qualities of the items; and a restriction value control unit () moving use restriction values through the transmitting and receiving unit so that, based on a result of the comparison, (i) a use restriction value of one of the items having a lower image quality is decreased by a predetermined value and (ii) a use restriction value of an other one of the items having a higher image quality is increased by the predetermined value.

Recording and reproducing apparatus and recording and reproducing system

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.

AV data transmission apparatus, AV data reception apparatus, and AV data transmission and reception system

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.

Data transmission apparatus, data reception apparatus, and data transfer system

A content receiving apparatus, capable of resuming transmission of a content without assigning a new key even when transmission of the content is suspended, is provided. A content receiving apparatus is an apparatus which receives contents. The content receiving apparatus includes: a key exchange unit which exchanges, with a content transmitting apparatus for transmitting a content, a key which is to be used in encrypting a content and which is valid only for a prescribed period; a reception unit which receives the content encrypted by using the key; a detection unit which detects when a time during which the key is not used reaches a prescribed time; and a transmission unit which transmits, to the content transmitting apparatus, information for not making the key invalid, when it is detected that the time during which the key is not is used has reached the prescribed time.

Content receiving apparatus

To provide a packet transmitter apparatus which can transmit contents protected by a content protection technique such as DTCP or the like, using packets such as IP packets which have become widespread. The packet transmitter apparatus includes a transmitting condition setting management unit () which extracts at least one of charge information, playback control information and copy control information of AV data from the inputted non-AV data or AV data and generates, based on the extracted information, encryption mode information indicating an encryption mode which becomes a condition at the time of transmitting the AV data; an encrypted data generation unit () which generates encrypted data by encrypting, based on the transmitting condition, the inputted AV data and adding encryption information headers based on the encryption mode information to the encrypted AV data; and a packet generation unit () which generates packets by adding packet headers to the generated encrypted data. The transmitting condition is to be determined as a combination of input terminal information, data format information and attribute information.

Packet transmitter apparatus

The conventional method of limiting the number of receiving apparatus has a problem that if the limited number of appliances is reduced to limit distribution to unspecified appliances outside a home, distribution to appliances in the home is limited unnecessarily. If the limited number of appliances is increased, distribution to appliances outside the home cannot be sufficiently limited. The invention provides at least one receiving apparatus, (e.g., digital television sets and PCs,) connected to a network and capable of receiving and using predetermined data, and a transmitting apparatus, (e.g., an AV server) for transmitting the data to the receiving apparatus via the network. Use of the data on the network is managed based on the transmission time required for transmission of predetermined information between the transmitting apparatus and the receiving apparatus.

Data use management system, transmitting apparatus having management function, and data use management method

A packets sending/receiving apparatus, comprising: authentication and key exchange means; encryption means for producing an encryption sending data; sending condition setting management means for producing sending condition setting information for setting sending condition of the sending packets; packetization means for producing the sending packets using the encryption sending data; receiving condition setting management means for producing receiving condition setting information for setting receiving condition of the receiving packets; packets reception means for receiving the reception packets; and decoding means for decoding the reception data using the decoding key.

Packet transmission/reception device

A recording and reproduction apparatus has

Recording and reproduction apparatus, medium and information assembly

Management in a disk according to conventional techniques is effective in only one recording area which is the entire disk, and therefore, it has been heretofore impossible to manage files by data type. A data recording/reproducing apparatus comprises recording area setting meansof setting a plurality of logical recording areas in a recording medium, and file management meanswhich manages files with reference to free area management information, recording file management information and deletion file selecting criteria information, and data recording/reproducing apparatus is characterized in that when judging that a free area for writing the new data is insufficient, the file management means, referring to the deletion file selecting criteria information, deletes a portion or all of at least one file or does not execute an operation for writing the new data.

Data recording/reproducing apparatus and program recorded medium

An interface circuit that accepts control commands for creating AV files, and a hard disk control circuit, are provided, and loop recording can be performed on the basis of an AV file. Further, in loop recording operation, a frame number of a first frame of an AV file is stored in an AV file area management table as an offset value, and a position of each frame is managed by assigning a corresponding frame number from a start of loop recording onward, thereby enabling position indication such that the record position and reproduce position increase with the passage of time, even in loop recording mode.

VIDEO/AUDIO DATA RECORDING APPARATUS, VIDEO/AUDIO DATA REPRODUCING APPARATUS, VIDEO/AUDIO DATA RECORDING/REPRODUCING APPARATUS, VIDEO/AUDIO DATA RECORDING METHOD, VIDEO/AUDIO DATA REPRODUCING METHOD, AND PROGRAM RECORDING PROGRAM RECORDING MEDIUM

Growing community of inventors

Osaka, Japan

Yasushi Ayaki