Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Takara Belmont Corporation

Masaya Miyazaki

Toshihisa Nakano

Motoji Ohmori

Yuichi Futa

Masaya Yamamoto

Natsume Matsuzaki

Kaoru Yokota

Kaoru Murase

Shunji Harada

Masao Nonaka

Senichi Onoda

Nobuyuki Enoki

Toshihisa Abe

Masayuki Kozuka

Yoshikatsu Ito

Hiroki Yamauchi

Mitsuaki Morita

Hideki Matsushima

Teruto Hirota

Yasushi Uesaka

Kenji Tagawa

Masashi Yamaguchi

Mitsuhiro Inoue

Yuusaku Ohta

Taihei Yugawa

Masanori Nakanishi

Takashi Kamada

Shinji Inoue

Jun Takahashi

Naohiko Noguchi

Kiyoshi Owada

Shinichi Matsui

Yuko Tsusaka

Masato Suzuki

Susumu Kobayashi

Soichiro Fujioka

Osamu Sasaki

Ryuichi Okamoto

Katsumi Tokuda

Masato Yamamichi

Tohru Nakahara

Toshimichi Matsuzaki

Masaki Horiuchi

Takashi Sakao

Yukinobu Nishikawa

Yoshihiko Motohashi

Akira Takuma

Toshihiko Obayashi

Kaori Haruna

Masahi Deguchi

A data processing device for playing back a digital work reduces the processing load involved in verification by using only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on a DVD. In addition, the data processing device improves the accuracy of detecting unauthorized contents by randomly selecting a predetermined number of encrypted units every time the verification is performed.

Unauthorized contents detection system

A group management device provides with a content a device included in a group managed by the group management device. The group management device includes a storage unit that stores a total number of remote device that the group management device currently registers, a maximum number of remote devices that the group management device is permitted to register, a total number of local device that the group management device currently registers, and a maximum number of local devices that the group management device is permitted to register. The group management device also includes a judging unit that judges whether the total number of the remote device exceeds the maximum number of the remote devices when it is judged that the one device is the remote device. The judging unit judges whether the total number of the local device exceeds the maximum number of the local devices when it is judged that the one device is the local device.

Group formation/management system, group management device, and member device

When a PC transmits a content request to a device registration apparatus in which a permitted number of devices have already been registered, an expiration time management unit judges whether any registration information registered in a registration list management unit has an exceeded registration expiration time. If registration information with an exceeded registration expiration time is registered in the registration list management unit, the registration list management unit deletes this registration information, and newly registers registration information of the PC.

Device registration system and device registration apparatus

Provided is a new system for content use and settlement. A user requests a mobile telephone charge management server () to perform proxy settlement for goods purchased using mobile telephones(),() and(). The mobile telephone charge management server () makes an inquiry to a registration server () as to whether or not proxy settlement is possible. When proxy settlement is not possible, the mobile telephone performs settlement using electronic money that has been deposited therein.

Content use system, information terminal, and settlement system

A content playback apparatus reduces load concentration on a specific server apparatus that manages content keys of encrypted content, while protecting copyrights of the content. The content apparatus makes playback of content recorded in a recording medium sold possible after the specific server breaks down. A key acquisition control unit () reads a playback control information table () from a recording medium () via a reading unit (). The key acquisition unit () acquires a rights key via a key acquisition intermediation unit () from an apparatus specified by an acquisition-destination type and a request-destination type that are stored in the playback control information table () and that corresponding to the content to be played. The key acquisition unit () generates a content key using the acquired rights key and, when required, a medium key recorded in a medium. A decryption unit () decrypts encrypted content using the content key.

Content playback apparatus, content playback method, computer program, key relay apparatus, and recording medium

Processing load on an executing device for conducting playback is high during the playback of contents since the executing device performs verification of the contents validity in parallel with the contents playback, and therefore the executing device has to be equipped with a highly efficient processor. The present invention reduces the processing load involved in the verification by using, for the verification, only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on the DVD. In addition, the present invention is capable of improving the accuracy of detecting unauthorized contents to some extent by randomly selecting a predetermined number of encrypted units every time the verification is performed.

A distribution serverdistributes a content via a network, and a KIOSK terminalreceives the content via the network and records the content in an SD memory cardA customer devicereceives a content via the SD memory cardchecks out the content and records a copy on a recording medium. SD-Audio playerstoreceive a copy of the content and play back the copy. Here, the KIOSK terminalrecords a Usage Rule that certifies the right to control recording of content on the SD memory cardMove Control Information showing the number of times that moving of rights is permitted is set in the Usage Rule.

Distribution system, semiconductor memory card, receiving apparatus, computer-readable recording medium and receiving method

The recorder/reproducer, when moving a first content data, writes a second content data, which is obtained by re-coding the first content data recorded in a first recording medium, into a second recording medium instead of the first content data, writes one or more first partial information extracted from the first content data into the second recording medium, and makes the first content data irreproducible, using one or more first invalidated partial information having one-to-one correspondence with the extracted one or more first partial information. When restoring the first content data, it makes the irreproducible first content data reproducible, using the one or more first partial information recorded in the second recording medium.

Recorder/reproducer and content data protection system for preventing unauthorized use of content

A content management system formed from a playback apparatus that requests and plays content, and a content management apparatus that manages duplication and deletion of content. The playback apparatus notifies group information of the playback apparatus to the content management apparatus, acquires information from the content management apparatus showing whether requests are permitted, and duplicates/deletes content. By judging whether the playback apparatus belongs to a group, and notifying whether a duplication request is permitted or rejected, based on in-group and out-group remaining numbers that show the remaining number of duplications permitted of apparatuses in-group and out-group, respectively, the content management apparatus relaxes restrictions on in-group content duplication as compared with out-group content duplication, and thus improves convenience for users in a home network, while protecting the rights of copyright holders, with respect to content duplication and usage.

Content-duplication management system, apparatus and method, playback apparatus and method, and computer program

An executing device conducts playback of contents. The executing device is equipped with a highly efficient processor and reduces the processing load involved in verification by using, for the verification, only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on a DVD. In addition, the executing device is capable of improving the accuracy of detecting unauthorized contents by randomly selecting a predetermined number of encrypted units every time the verification is performed.

A system includes of a main device and a recording medium device. The main device includes a reception unit that receives a digital work from an external distribution server, an internal storage area for storing the digital work, a playback unit that plays back the digital work, and a unique information storage area for storing information that is unique to the main device. The main device also includes an encryption unit that encrypts the digital work using the unique information, a decryption unit that decrypts, using the unique information, the encrypted digital work having been read from the recording medium device, a write unit that writes the encrypted digital work into the recording medium device which is portable, and a read unit that reads the encrypted digital work from the recording medium device.

Digital work protection system, record/playback device, recording medium device, and model change device

Disclosed is a digital work protection system enabling a content distributor to flexibly define usage patterns of content permitted for users. The system is composed of a recording device and a playback device. The recording device acquires a digital work, range information showing a permission range within which the digital work is permitted to be used, and a subrange key for each subrange, generates an encryption key using all the acquired subrange keys, encrypts the digital work based on the encryption key to generate encryption information, and writes the encryption information and the range information to a recording medium. The playback device reads the range information and the encrypted information from the recording medium, acquires a subrange key for each subrange, generates a decryption key using all the acquired subrange keys, decrypts the encrypted information based on the decryption key to generate a digital work, and plays the digital work.

Digital work protection system

Growing community of inventors

Osaka, Japan

Masaya Miyazaki