Matsushita Electric Industrial Co., Ltd.

Mitsubishi Denki Kabushiki Kaisha

Other

Panasonic Corporation

Matsushita Electrical Industrial Co., Ltd.

Matsushita Electric Corp., Ltd.

Yoshinari Takemura

Kenji Koishi

Takashi Ishida

Shunji Ohara

Mitsuaki Oshima

Shigeru Furumiya

Mitsurou Moriya

Yoshiho Gotoh

Shinichi Tanaka

Isao Satoh

Toyoji Gushima

Shin-ichi Tanaka

Yoshito Aoki

Yuichi Kamioka

Satoshi Kondo

Kazuhiko Nakane

Takeshi Nakajima

Masato Nagasawa

Yoshinobu Ishida

Michiyoshi Nagashima

Norio Miyatake

Motoyoshi Murakami

Shinichi Konishi

Kazuaki Obara

Akira Mutoh

Yuji Takagi

Hideki Fukuda

Hiroyuki Ohata

Hiromu Kitaura

Kenji Gotoh

Ryoji Yamaguchi

Keiichi Kawashima

Masaaki Kondo

Hiroyuki Suzuki

Takashi Inoue

Hironori Deguchi

Yoshiharu Kobayashi

Yoshitaka Mitui

Yoshino Gotoh

Yoshiro Gotoh

Katsuhiko Yoshida

Shin-Ichi Tanaka

The operating and other procedures of a disk or recording medium application system of the type for which a network is used are simplified. Disks or recording media have auxiliary data recording areas, where different IDs for individual disk, and/or cipher keys and/or decoding keys for ciphers are recorded in advance in a factory. By using the IDs to release the soft ciphers, and using the cipher keys when sending the ciphers, and using the decoding keys when receiving the ciphers, user authorization procedures are simplified.

Recording medium reproducer, cryptocommunication system and program license system

An optical disk that includes main information and write-once information recorded on the optical disk. The write-once information is recorded as information unique to the optical disk, and the write-once information stores at least watermark production parameters for producing a watermark.

Magneto-optical recording medium having watermark for preventing unauthorized copy

A content recording method using a communication means, including reading from a recording medium identification information unique to that recording medium, receiving through the communication means permission information for permitting recording of content on that recording medium, receiving content information through the communication means, and after confirming validity of the permission information, encrypting the received content information using both the unique identification information and a cipher key, and recording the encrypted content information on the recording medium.

Apparatus for encrypting and recording received content information on a recording medium using both medium identification information and a cipher key for encryption

Recording medium, recorder, reproducer, cryptocommunication system and program license system

When recording and reproduction are performed at the same time, if a system controller detects that an amount of data accumulated in a buffer memory exceeds a predetermined value, the system controller stops data reading from an optical disk temporarily and records data accumulated in the buffer memory continuously to the optical disk. Then, an image is prevented from becoming abnormal when a reproduction position catches up to a recording position. Further, a system controller monitors a zone in an optical disk, to which recording is performed and controls a motor at an appropriate revolution number for the recording to the zone. Further, reproduction is performed by maintaining the revolution number. Then, even if the recording position and the reproduction position belong to different zones in a recording medium, a transition time from recording to reproduction is prevented from becoming long.

Simultaneous recording and reproduction apparatus and simultaneous multi-channel reproduction apparatus

An optical disk having a first recording area for recording information; and a second recording area having auxiliary information including disk identification information unique to that optical disk recorded therein, wherein the second recording area including circumferentially arranged multiple stripe patterns each strip extending along a radius of the disk; and indicator indicating the presence of auxiliary information.

Recordable optical disk including an auxiliary information presence indicator

Method and apparatus for encrypting and recording received content information on a recording medium using both medium identification information and a cipher key for encryption

When recording and reproduction are performed at the same time, if a system controller detects that an amount of data accumulated in a buffer memory exceeds a predetermined value, the system controller it stops data reading from an optical disk temporarily and records data accumulated in the buffer memory continuously to the optical disk. Then, an image is prevented from becoming abnormal when a reproduction position catches up to a recording position. Further, a system controller monitors a zone in an optical disk, to which recording is performed and controls a motor at an appropriate revolution number for the recording to the zone. Further, reproduction is performed by maintaining the revolution number. Then, even if the recording position and the reproduction position belong to different zones in a recording medium, a transition time from recording to reproduction is prevented from becoming long.

An optical disk recordable by a recording device and having first and second recording areas, the second recording area having recorded therein disk identification information unique to the disk, and multiple cipher keys, the first recording area being capable of having recorded therein information that is encrypted by using the disk identification information and one of the multiple cipher keys during recording.

Recordable optical disk encrypted with disk identification and multiple keys

A device for recording information on an optical disk having first and second recording areas, which device can record information into the first recording area, using a first modulation method; read disk identification information recorded by a second modulation method in the second recording area; detect auxiliary information indicating the presence of disk identification information; encrypt information using both a cipher key and the disk identification information unique to the optical disk; and permit recording of encrypted information after confirming the presence of the disk identification information.

Device for encoding encrypted information on an optical disk

The operating and other procedures of a disk or recording medium application system of the type for which a network is used are simplified. Disks or recording media have auxiliary data recording areas, where different IDs for individual disks, and/or cipher keys and/or decoding keys for ciphers are recorded in advance in a factory. By using the IDs to release the soft ciphers, using the cipher keys when sending the ciphers, and using the decoding keys when receiving the ciphers, user authorization procedures are simplified.

The optical disk of this invention includes a read-only area in which a plurality of read-only tracks are formed and a rewritable area in which a plurality of rewritable tracks are formed, wherein each of the plurality of read-only tracks is divided into a plurality of first sectors, a signal is prerecorded in at least one of the plurality of first sectors under a predetermined reproduction format, each of the plurality of rewritable tracks is divided into a plurality of second sectors, a signal is recordable in at least one of the plurality of second sectors under a predetermined recording format including the predetermined reproduction format, and the read-only area is located on an inner portion of the optical disk, while the rewritable area is located on an outer portion of the optical disk.

Optical disk having read-only and rewritable areas

A method for reproducing write-once information from an optical disk. The disk includes a disk substrate and a recording layer on the disk substrate, the recording layer including a magnetic film with a magnetic anisotropy in a direction perpendicular to a surface of the magnetic film. Write-once information formed by first recording areas and second recording areas is stored in a pre-determined portion of said recording layer, the first and second recording areas having different magnetic anisotropies in a direction perpendicular to a surface of the magnetic film. The method includes irradiating linearly polarized laser light onto said pre-determined portion, and detecting a rotational change in a polarization orientation of light reflected from the optical disk or light transmitted through the optical disk, the rotational change being caused depending on which of the first recording area and the second recording area is irradiated with the linearly polarized laser light.

Method for reproducing information data from magneto-optical recording medium using linear polarized beam

Address groups are composed of two of address blocks , and , where the address blocks , and are disposed in a sector address region and include identifiable information of address numbers and overlapping sequential numbers . The address groups are disposed so that each group is alternately shifted from a track center toward the inner periphery side or the outer periphery side, by a width substantially equal to half the track pitch, along the radius direction.

Optical disk and a recording/reproduction apparatus using multiple address block groups shifted oppositely with multiple address blocks and non-pit data

Optical disk and a recording/reproduction apparatus using multiple address block groups shifted oppositely with multiple address blocks having clock synchronization, address number and address ID

Growing community of inventors

Settu, Japan

Yoshinari Takemura