Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Matsushita Electric Industrial

Takahiro Nagai

Yuji Takagi

Shunji Ohara

Hideshi Ishihara

Isao Satoh

Yoshihisa Fukushima

Takashi Yumiba

Mamoru Shoji

Masaru Yamaoka

Takashi Ishida

Hiroyuki Yamaguchi

Harumitsu Miyashita

Rie Takahashi

Motoji Ohmori

Motoshi Ito

Makoto Tatebayashi

Masazumi Yamada

Yuji Hisakado

Yoshito Aoki

Mitsuaki Oshima

Hiroshi Ueda

Toshihisa Nakano

Shinichi Tanaka

Atsushi Nakamura

Kaoru Murase

Yasumori Hino

Makoto Usui

Kenichi Shibata

Hiroshi Sugimoto

Naoya Takao

Takahiro Sato

Yasushi Ueda

Junji Yoshida

Makoto Okazaki

Kenzo Ishibashi

Kentaro Tanikawa

Shiro Iwasaki

Yukio Iijima

Kei Ichikawa

Nobuaki Minakuchi

Ayako Takatsuji

Yoshitaka Mitsui

Hirofumi Ide

Takashi Yano

Tadashi Jahana

Tetsuyuki Nakayasu

Hisami Ibaraki

Yukio Matsuura

Takuo Otsuki

Kouhei Nakata

Yousuke Suzuki

Akira Kawasaki

Noriya Mashimo

A recording and playback apparatus can continue the playback of a content with playback time limit, even after the playback time limit expires during the playback of the content, and does not play back the content even though an instruction receiver receives a playback instruction when the playback of the content is stopped after the playback time limit of the content expires during the playback of the content with the playback time limit. The recording and playback apparatus outputs the warning information, when the instruction receiver receives the stop instruction after the playback time limit of the content expires during the playback of the content.

Recording and playback apparatus

A data processing device connects to a first display and operates in a power state including a power-off state, a recording standby state, and a power-on state. A second display displays an operation state of the data processing device. A power controller supplies electric power to a driver in the power-on state and the recording standby state, and stops supplying the electric power in the power-off state. The second display indicates that power is ON in the power-on state, and indicates that the power is OFF in the recording standby state and the power-off state. The power controller switches the power state from the recording standby state to the power-on state when a signal instructing start of a recording operation is received from the first display and the power state is the recording standby state.

Data processing device and power control method

A digital work () and copyright management information () for the digital work are recorded on an information recording medium () by altering a shape, a position or a pattern () of recording mark edges of the digital work. Alternatively, a decryption key for the right management information is recorded on an information recording medium on which the copyright management information has been recorded encrypted, by altering the recording mark edges of the copyright management information. Alternatively, a check code for the copyright management information is recorded on the information recording medium by altering the recording mark edges. The check code is checked when the copyright management information is read, thus detecting illegal use of the copyright management information.

Information recording medium, usage management method, and usage management apparatus

A communication apparatus establishes a one-way data connection and a connection to a network in which messages are transferred in two ways, and includes: a one-way data connection status detecting unit which detects a connection validating request indicating a communication apparatus on a data reception side that data transmission, utilizing the one-way data connection, is possible and a connection invalidating request indicating that the data transmission is impossible, both of which are outputted from the communication apparatus on the data reception side; an apparatus address obtaining unit which obtains an apparatus address with a message via the network when a change from the connection invalidating request to the connection validating request is detected; an address holding unit which holds the apparatus address; and a message transmission continuing unit which responds to the message received via the network based on the apparatus address held by the address holding unit regardless of whether or not the connection invalidating request is detected.

Address managing method and communication apparatus

An authentication communication system is capable of storing information relating to revoked devices in less area than is conventionally required. A computer unit stores in advance revocation information that indicates at least one revoked apparatus, and when authenticating a driver unit judges, based on the revocation information, whether or not the driver unit is revoked. The computer unit prohibits communication with the driver unit when the driver unit is judged to be revoked, and communicates with the driver unit when the driver unit is judged not to be revoked.

Authentication communication system, authentication communication apparatus, and authentication communication method

The present invention has an object to operate a reproduction apparatus (an apparatus from which video is inputted) using only a remote control of a video display apparatus. A video display apparatus which displays video includes: a first display unit which displays a menu screen of the video display apparatus; a switching unit which switches a current input to an input from an input source device from which video is inputted when the input source device is indicated in the menu screen displayed by the first display unit; and a second display unit which displays a menu screen of the input source device when the switching unit switches the current input.

Video display apparatus and reproduction apparatus

An MPEG2-PS format digital stream is composed of VOBUs and each VOBU except an RDI-Pack at the top is encrypted using a content key Kc. The content key Kc is an encryption key obtained by adding a title key Kt to CCI, and then converting a time varying coefficient using the sum. Accordingly, the resulting content key Kc differs for each VOBU. Since each content key Kc is all different for such a small unit of VOBU, copyright of the digital stream is firmly protected. CCI contained in RDI-Pack represents conditional Copy Freely status which allows the digital stream to be copied on condition that the digital stream is recorded only in encrypted form.

Recording medium, recording apparatus, reading apparatus, and program and method therefore

An optical disc recording apparatus () includes a system control unit () that judges whether main information and sub information which is recorded by being superimposed on said main information, relocates and records the main information or the sub information, or the main information and the sub information in a replacement area, when it is judged to be a defective area, and registers information in a defect management area in the optical disc, the information associating the defective area with the replacement area to which said defective area is relocated.

Method for controlling defect of optical disk, optical disk recording device, and optical disk reproducing device

An encryption device, a decrypting device, a secret key generation device, a copyright protection system and a cipher communication device including: a CRL memory unit memorizing a CRL, a device key ring memory unit memorizing a specific device key KD_A in every IC card used in a decrypting device, a content key memory unit memorizing a content key Kc, which is a secret key for decrypting content, and a hashing function processing unit calculating a hashing value of the CRL memorized in the CRL memory unit. The devices further including an Ex-OR unit carrying out an exclusive OR between the hashing value and the device key KD_A memorized in the device key ring memory unit, and an Enc unit encrypting the content key Kc memorized in the content key memory unit using an output value of an Ex-OR unit.

Encryption device a decrypting device a secret key generation device a copyright protection system and a cipher communication device

An optical disk according to the present invention is the optical disk on which secret information on unique information given to a specific optical disk manufacturer or a specific optical disk and information recorded on an infringement disk list of identifying an illegitimate optical disk manufacturer or an illegitimate optical disk are recorded in advance, and the optical disk has an area in which reproduction-only encrypted data encrypted based on the secret information and the information on the infringement disk list is recorded in advance or an area capable of recording the encrypted data to be encrypted based on the secret information and the information on the infringement disk list.

Optical disk and optical method

A recording/reproducing apparatus includes: a first storage section for storing data structure information which includes encrypted data; a special information holding section for holding special information associated with the data structure information; and a controller for controlling the first storage section and the special information holding section. The data structure information is associated with the special information such that the special information is updated in response to an update of the data structure information, or such that the data structure information is updated in response to an update of the special information. The controller controls movement of the encrypted data from the first storage section to a second storage section, and the controller updates the special information such that a mismatch occurs between the special information obtained before the movement of the encrypted data and the special information obtained after the movement of the encrypted data.

Recording/reproducing apparatus, data moving method, and data deletion method

An optical disc recording method is provided for superimposing sub information by displacing edges of one or more optically-readable recording marks by a minute amount on the basis of a binary sequence code, when recording main information by forming said one or more recording marks, the optical disc recording method including a sequence generation step of generating a first binary sequence code and a second binary sequence code that is different from the first binary sequence code; a first displacement step of displacing one of the edges according to the first binary sequence code; and a second displacement step of displacing another of the edges according to the second binary sequence code.

Optical disc recording method and optical disc reproducing method

An optical disk is provided that disables reproduction of sub-information even if the sub-information as a contents encryption key is recorded entirely onto another optical disk. Sub-information is recorded on the optical disk by deforming a recording mark slightly in accordance with a pseudo random number sequence that is obtained using as an initial value medium ID that is read out medium inherent information. This allows sub-information inherent in a medium to be recorded, and even if the sub-information is duplicated entirely to another optical disk, the illegally duplicated sub-information cannot be reproduced because of a difference in initial value of a pseudo random number sequence between media.

Information recording medium, information recording apparatus and information reproduction apparatus for the same

An optical disc has a plurality of sectors, where each of the plurality of sectors includes a plurality of frames. A sub information bit value of '0' or '1' is assigned to the plurality of frames constituting a sector, excluding the first and last frames. Edge positions are displaced so that leading/lagging errors appear in accordance with a certain rule when data fields of the frames to which the sub information bit value &#x201c;1&#x201d; is assigned are read. Edge positions are displaced so that leading/lagging errors appear in accordance with a reversal of the certain rule when data fields of the frames to which the sub information bit value &#x201c;0&#x201d; is assigned are read.

Optical disc, recording apparatus method, and reproduction apparatus and method

An information recording medium for recording main information and auxiliary information is provided. The auxiliary information is recorded on the information recording medium in a manner that edge positions of the pits or the recording marks indicating the main information are shifted either in a phase advancing direction or in a phase delaying direction along the track direction. A predetermined frequency is used to determine whether the edge position is shifted in the phase advancing direction or in the phase delaying direction in order to record the auxiliary information. The predetermined frequency is substantially consistently lower than &#xbd; of a reference frequency of a recording clock for creating the pits or the recording marks and is higher than a response frequency of a PLL for generating a reproduction clock for reproducing the main information.

Information recording medium, recording apparatus, and reproduction apparatus

Growing community of inventors

Osaka, Japan

Takahiro Nagai