Kabushiki Kaisha Toshiba

Tokyo Shibaura Denki Kabushiki Kaisha

Matsushita Electric Industrial Co., Ltd.

Sony Corporation

Pioneer Electronic Corporation

Meiji Milk Products Company, Limited

Hitachi, Ltd.

Other

Tadashi Kojima

Koichi Hirayama

Toshihiko Kaneshige

Hisashi Yamada

Sigeru Todokoro

Masahide Nagumo

Jun Inagawa

Taku Kato

Shin-ichi Tanaka

Toshiyuki Shimada

Susumu Hoshimi

Meisei Nishikawa

Hideki Mimura

Takao Arai

Toshifumi Takeuchi

Yoshiaki Moriyama

Fumihiko Yokogawa

Tooru Kamibayashi

Tamotsu Kuwata

Kouya Tochikubo

Akio Tanaka

Tetsuo Kaneko

Yoshiro Yamamoto

Shigeru Todokoro

Hideo Ando

Yoshihisa Fukushima

Hiroaki Unno

Shinichi Tanaka

Atsushi Ishihara

Yasuhiro Hayashi

Takashi Yumiba

Yoshiyuki Ishizawa

Naoki Endoh

Takehisa Kato

Masatoshi Shimbo

Akira Kurahashi

Koichi Otake

Shinya Yamada

Yukio Nakamura

Kazuhiko Taira

Yuji Nagai

Yutaka Kashihara

Hiroshi Suzuki

Akira Kobayashi

Takeshi Inagaki

Mitsuru Nagata

Masaki Nakagawa

Hiroshi Kobata

Satoshi Kageyama

Satoru Maeda

Toshitaka Kobayashi

Mitsuo Yamazaki

Hiroharu Sato

Kouichi Hirayama

June Inagawa

Fumihiko Pioneer Electronic Corp Yokogawa

Yoshiaki Pioneer Electronic Corp Moriyama

Reinforcement of a system renewability is realized skillfully utilizing properties peculiar to a system. As a result, there is produced such a new effect as to similarly reinforce required specification with respect to copyright protection of a content recorded in a medium for exclusive use in reproduction and a recordable medium. In a system which encrypts information such as a content to record/reproduce the information, design is made so that encryption/decryption processing information differs for a device (software (S/W) main body device) whose main body is software constituted of a recording/reproducing drive of a recording medium and a personal computer (PC), a device (hardware (H/W) main body device) whose main body is hardware integrally containing a drive and data coding/demodulation processing, and the medium for exclusive use in reproduction and the recording medium.

Copyright management method, information recording/reproducing method and device, and information recording medium and method of manufacturing the medium

In a content management method, content data is encrypted by a first key, the first key is encrypted by plural types of second keys, the encrypted first key is multiply encrypted by a third key, and the third key is encrypted by a fourth key. These encrypted content data, a medium key which is the first key encrypted by the second key and a move key which is a first key multiply encoded by the second and third keys are recorded in a recording medium, the third key encrypted by the fourth key is recorded in a security region. This management method is managed by the move key and the medium key.

Content management method, recording and/or reproducing apparatus, and recording medium

On a recording medium, first information obtained by enciphering data with the first key and second information obtained by enciphering the first key with each of the predetermined second keys are recorded. A deciphering method is characterized by comprising the steps of inputting the first and second information, deciphering the first key using at least one of the second keys, determining by a specific method that the obtained first key is correct, and then deciphering the data using the first key to obtain the data.

Method and apparatus of enciphering and deciphering data using keys enciphered and deciphered with other keys

A row of the data block which is a set of the data sector is distributed to constitute two blocks. In this case, as a distribution condition, an even-number row block of the even-number sector and the odd-number row block of the even-number sector, the odd-number row block of the even-number sector and an even-number row block of the even-number sector are obtained. Then, the block is aggregated in the transmission order, and an outer parity is scattered to each sector to form an interleaved form.

Data processing method and apparatus, recording medium, reproducing method and apparatus

A burst error-correcting capability is largely improved. At least the even-number row and at least the odd-number row of the data block which is a set of data sectors are separated. An outer parity is created for each column and an inner parity is created for each row. Then, the outer parity is scattered with respect to each of the sectors of the data block to be interleaved.

Data processing method and apparatus, recording medium, reproducing method and apparatus using the same method

An information recording method for recording content information in a recording medium having at least re-readable area, comprising converting, based on a first conversion rule &#x3c6;, first information including a first component for obtaining content control information, converting, based on a second conversion rule &#x3c6;, second information including a second component for obtaining the first information, and writing the converted first information and the converted second information into the re-recordable area of the recording medium.

Method and apparatus for recording information including secret information and method and apparatus for reproduction thereof

A transmitting method of digital data whereby information data can be reproduced at a high precision. In order to retain digital data in sectors comprising a plurality of sync frames and sequentially transmit, the sync frame is comprised of the sync signal and the run length limited code which satisfies the limitations of the minimum run length and the maximum run length, and the sync signal includes the sync pattern constituted by a bit pattern of a run length that is longer than the maximum run length by onlyT and addition bit patterns which are arranged before and after the bit pattern and each of which has a urn length that is longer than the minimum run length. The sync signal includes a specific code which indicates a position in the sector and which enables the DC control to be performed.

Digital data transmitting method

A sync pattern detection apparatus includes a sync pattern detection unit configured to detect a sync pattern from an input signal, a plurality of sync pattern protection units configured to protect the sync pattern detected by the sync pattern detection unit, a reliability evaluation unit configured to evaluate the reliabilities of a plurality of sync pattern protection situations by the plurality of sync pattern protection units, and a selection unit configured to select a sync pattern protected by a predetermined sync pattern protection unit, on the basis of the reliability evaluation of the plurality of sync pattern protection situations by the reliability evaluation unit.

Sync pattern detection method and apparatus

Growing community of inventors

Yokohama, Japan

Tadashi Kojima