Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Kabushiki Kaisha Toshiba

Takashi Yumiba

Takahiro Nagai

Hideshi Ishihara

Masaru Yamaoka

Koichi Morioka

Keiichi Kawashima

Mitsuaki Oshima

Mamoru Shoji

Teruyuki Takizawa

Harumitsu Miyashita

Yoshihisa Fukushima

Haruo Yamashita

Makoto Usui

Hiroyuki Yamaguchi

Shin-ichi Kadowaki

Mitsurou Moriya

Mitsuro Moriya

Toyoji Gushima

Shin-ichi Tanaka

Rie Takahashi

Akihiko Nishioka

Tadashi Kojima

Koichi Hirayama

Shinichi Konishi

Kouichi Morioka

Takashi Ishida

Motoshi Ito

Shinichi Tanaka

Atsushi Nakamura

Hiromichi Ishibashi

Makoto Tatebayashi

Kaoru Yokota

Yuji Takagi

Shunji Ohara

Takahiro Sato

Hiroyuki Yabuno

Yoshihiro Tabira

Isamu Ishimura

Hirotaka Itoh

Shinichiro Takigawa

Tadashi Jahana

Kouhei Nakata

Motoyuki Fujino

An optical storage medium can be provided by which illegal usage of the optical storage medium involving an infringement on the copyright can be prevented effectively without impairment of the functions for reproducing physical format information and optical storage medium manufacturing information. The optical storage medium includes a main information region in which encrypted data information is recorded as a pit row that is capable of being read out by means of light and a control data region. In the control data region, key information for decoding the encryption of the data information, the physical format information and the optical storage medium manufacturing information are recorded by wobbling a groove.

Optical storage medium, information recording apparatus, and information reproducing apparatus

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

Optical storage medium control data region

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 information recording medium, such as an optical disk or the like, is provided for recording at least copyrighted content information and cipher key information. A part of the content information is scrambled and recorded in the information recording medium, and the scrambled and recorded part of the content information is obtained through scrambling using scramble key information, which is obtained by converting the cipher key information by the use of a non-scrambled part of the content information. The information recording medium has a recording area divided into a plurality of sectors. A plurality of data which the content information is divided into is recorded in the sectors. The non-scrambled part of the content information includes copy control information and a part of the content information that changes sector by sector.

Information recording medium for recording a scrambled part of content information, and method and apparatus for reproducing information recorded therein

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

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

An optical disk is provided for recording data of a signal modulated according to a predetermined modulation method in a form of concavo-convex pits. The optical disk includes a first area having a reflecting film partly removed, and a second area for recording pits which are different from pits satisfying requirements of the predetermined modulation method. The first area having the reflecting film partly removed includes a portion which is formed by removing the reflecting film, and has a length longer than a maximum pit length determined by the modulation method in a circumferential direction of the optical disk. When the pits recorded on the optical disk are physically copied as they are, physical copying of the optical disk can be prevented by utilizing such a difference that the authorized optical disk differs from a pirated copy in a combination of the respective reproduced signals of the first and second areas.

Optical disk, and method and apparatus for reproducing information recorded in optical disk

A plurality of tracks on an optical disk are optically read to obtain a signal containing a plurality of LOW segments. Each of the plurality of LOW segments should correspond to a certification pit. Accordingly, if the interval between LOW segment Xand nth succeeding LOW segment Xexceeds the length of one track, a defect pit that could be confused with a certification pit is judged as being present between two certification pits.

Device and program for checking optical disks

An optical disc storing a copyrighted digital product has a data area in which N processed parts are provided in order to certify that the stored digital product is an original one. A BCA provided on the optical disc stores judgment criteria information as well as N pieces of physical feature information. The judgment criteria information includes a numeric value N being the total number of processed parts, and a numeric value M being an integer between 0 and N inclusive and representing the security level to be assured for the digital data stored. When a numeric value P being the total number of processed parts in a normal state exceeds the numeric value M, a reproduction device reproduces the optical disc. When the numeric value P falls short of the numeric value M, the reproduction device does not reproduce the optical disc.

Optical disc, recording device, and recording device

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Kyotanabe, Japan

Takashi Yumiba