Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Matsushita Electric Co., Ltd.

Hiroyuki Iitsuka

Masazumi Yamada

Takuya Nishimura

Hidetoshi Takeda

Hideaki Takechi

Naoshi Usuki

Shoichi Gotoh

Natsume Matsuzaki

Yoshiki Kuno

Yasunori Kawakami

Shoichi Goto

Yoshifumi Yanagawa

Yasushi Ayaki

Ryogo Yanagisawa

Takahiko Nankou

Ayako Takatsuji

Keiichi Kameda

Satoshi Kondo

Akira Iketani

Kenichi Takahashi

Norihiko Mizobata

Shinji Hamai

Hideyuki Kuwano

Toshiaki Tsuji

Hiroki Yamauchi

Hirotoshi Uehara

Yukio Kurano

Nobuyoshi Yokobori

Yasuyuki Sahara

Kazutsugu Kobayashi

Toshikazu Kodo

Hideyuki Takeda

Yasuo Nishiwaki

Takahiko Nanko

Aki Yuasa

Ken Noda

Kouichi Horigami

In a system which attaches update information required to create a content key used for content encryption/decryption to encrypted content and transmits the encrypted content, there is used an authorized content verification method including a verification request step of, by a receiver, transmitting an authorization verification request including update information received from a transmitter, an update information check step of, by the transmitter, checking whether the update information included in the received authorization verification request is predetermined update information, a message-of-acceptance transmission step of creating a message of acceptance using the update information and an exchange key shared between the transmitter and the receiver and transmitting the message of acceptance if the update information matches the predetermined update information, and an authorized content determination step of, by the receiver, determining that content is authorized content on the basis of reception of the message of acceptance.

Authorized content verification method, content transmission/reception system, transmitter, and receiver

A system including a server holding content and a terminal using the content, whereby the terminal is registered in the server if a communication time between the terminal and the server is less than or equal to a reference value. A measuring unit of the server measures a communication time from transmitting measuring information to the terminal until receiving response information from the terminal, and repeats the transmission, the reception, and the measurement until the measured communication time is less than or equal to the reference value. An elapsed-time measuring unit measures an elapsed time from when the measuring unit first begins measuring the communication time, and a transmission unit transmits, to the terminal, status notification information showing a processing status depending on the elapsed time. A response unit of the terminal receives measuring information from the server and transmits response information to the server when the measuring information is received.

Server, terminal apparatus, device registering system, registering method, registering program and recording medium

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

A data transmitting and receiving method for improving transmission and reception efficiency can be obtained by improving the security through update of a control key and reduction of the frequency of the authentication and key exchange process. An STBtransmits encrypted digital data Kw (D) obtained by encrypting digital data D using a work key Kw, and an encrypted work key Kc (Kw) obtained by encrypting the Kw using a control key Kc. The Kc is periodically or non-periodically updated, and an identifier L identifying the Kc is assigned to each Kc. A VTR devicedecrypts the received Kc (Kw) using the Kc obtained by performing the authentication and key exchange process with the STB, decrypts the Kw (D) received using the Kw to obtain the D. It is determined whether or not the Kc has been updated while the reception process is suspended by referring to the transmitted L when the reception process is suspended and then resumed. If it is determined that the Kc has been updated, then the authentication and key exchange process is performed again to obtain the updated Kc.

Data transmitting/receiving method, data transmission apparatus, data reception apparatus, data transmission/reception system, AV contents transmitting method, AV contents receiving method, AV contents transmission apparatus, AV contents reception apparatus, and program recording medium

A signal switching device including an interface having a video signal communicating unit, a DDC and an HPD, controlling connected device, or being controlled by connected device. A switcher () includes a switch () selecting video signal input, a DDC () reading information from output destination device, a microcomputer () reading information indicating a physical address of switcher () and a status of the output destination device through DDC (), and a DDC () and a DDC () outputting information to a plurality of input source devices. The microcomputer () stores the physical address of the switcher () and above-mentioned information into an EDID memory () and reads the above-mentioned information out of the EDID memory () and outputs through the DDC () and the DDC ().

Signal switching device, signal distribution device, display device, and signal transmission system

Detecting an input source of a signal of a device connected to a bus and determining whether the signal is converted, extracted, multiplexed, or processed. Efficiently controlling the connection of each unit connected on the bus. Issuing a command for detecting the output plug or source plug as the signal source. The unit or subunit receiving this command shows the signal source. Obtaining information showing whether a subunit is present in the unit or not.

System and method for determining the connection state of devices connected to a bus

A multichannel display data generating apparatus for generating data for displaying AV data on a multiscreen has a plurality of screens for displaying AV data of a plurality of channels, said apparatus comprising:

Multichannel display data generating apparatus, medium, and informational set

It is objected to simplify a procedure concerning bandwidth acquisition. Bandwidth acquiring meansof a second transmitting apparatusacquires a bandwidth which was used by a first transmitting apparatusby using a propagation delay identifierread from first transmitting apparatusand a maximum transmission data sizeafter stopping transmission of first transmitting apparatus. Each apparatus is composed so that transmission is started using this bandwidth and because returning and re-acquisition are not accompanied when the transmission is switched, necessary procedure can be simplified. Further, it is possible to effectively use the bandwidth by using a propagation delay identifier.

Data transmitting apparatus, data receiving apparatus and data transmission control apparatus

A Controllersends to a Consumera command for reserving a plug/port in order to send/receive data using an Asynchronous transmission (Step) and receives information on a port connecting from the Consumer(Step). The Controllerfurther sends to a Producera command for reserving a port/plug for sending content or the like (Step) and receives from the Producerinformation on a Producer plug/port used for transmission (Step). After this, the Controllernotifies the Consumerof the information on the port of the Producer(Step) and receives a response from the Consumer(Step). Next, the Consumerissues a device authentication request command to the Producer(Step) and they perform mutual device authentication and exchange of keys (Step).

Data transmitting apparatus, data receiving apparatus, data transmission system and data transmission method

In the case that a bridge unit is connected to a network such as an IEEE 1394 bus, copyright holders want to limit the number of apparatuses that can receive a signal. The invention provides at least one reception unit, or more, that is utilized for receiving data requiring copyright protection, connected to a network and by providing a transmission unit for transmitting data requiring copyright protection to a reception unit by utilizing a network, wherein the transmission unit has an authentication means on the transmission side for carrying out authentication for a reception unit and an authentication number counting means for counting the authentication number that is the number of the authentications carried out by the authentication means on the transmission side while the reception unit has an authentication means on the reception side for carrying out authentication for the authentication means on the transmission side and wherein the above authentication number is limited.

Copyright protection system, transmitter, receiver, bridge device, copyright protective method, medium, and program

A data recording/reproducing method wherein encrypted digital data obtained by subjecting digital data to first encrypting by using a contents key and encrypted contents key obtained by subjecting the contents key to second encrypting are recorded on a recording medium, the encrypted digital data and the encrypted contents key, having been recorded, are reproduced, and the encrypted digital data is decrypted by using the contents key obtained by decrypting the encrypted contents key, thereby to obtain the digital data.

Data recording/reproducing method, data recording/reproducing system, recording apparatus

A data transfer method which eliminates erroneous operation of conventional devices not supporting encryption when copy-protected AV information is encrypted and sent on an IEEE 1394 bus. Synchronous data transferred through isochronous communication contains i) encryption identification information for indicating encryption of actual data and ii) actual data. Only the actual data is encrypted. Encryption identification information indicating encryption of actual data in synchronous data is sent together with actual data from the sending device. A receiving device detecting encryption of actual data from this encryption identification information requests decrypting information from the sending device. The receiving device decrypts the actual data using decrypting information received from the sending device according to this request.

Data transfer method

The problem to be solved is that once copyright claimed AV data is passed to application software, the application software can freely process the AV data for recording, etc., defeating the purpose of copyright protection. The invention provides a computer which comprises a system sectionand an application software section, and which takes in copyright claimed, encrypted data via a digital interfacefor processing therein, wherein the system sectionjudges that the application software sectionis legitimate application software for the protection of copyright, and if the application software is a legitimate one, the system sectionpasses a key for the encrypted data to the application software section

Computer and program recording medium

A data transmitter for detecting a reference time stamp for use in reproducing a system clock from a transport packet data of a first transport stream, adding the detected reference time stamp as a header information to the transport packet data, converting the transport packet data and the header information into a second transport stream, and transmitting the second transport stream.

Data transmitter and data receiver

A digital AV data transmitting unit includes a data significance deciding section for deciding the significance degree of digital AV data, and a transmitting-side plurality-of-authentication-rules storing section storing a plurality of types of authentication rules. Also included are a transmitting-side authentication selecting section for selecting one type of authentication rule from the transmitting-side plurality-of-authentication-rules storing means in accordance with a decision result by the data significance deciding section when receiving an authentication request, and a transmitting-side authenticating section for performing authentication in accordance with the selected authentication rule.

Growing community of inventors

Katano, Japan

Hiroyuki Iitsuka