Yusei Nishimoto

Integrated Digital Rights Management for Mobile IPTV Using Broadcasting and Communications

This paper presents a digital rights management (DRM) scheme for mobile broadcasting that integrates management via broadcasting and communications. The scheme provides access control and rights protection for subscription Mobile IPTV (Internet Protocol TV), enabling transmission of contract information to control broadcasting reception via both broadcasting wave and communications. It has transmission functions that reduce the amount of contract information that has to be transmitted through broadcasting as well as a function for transmitting contract information via communications. A PC simulation indicates that the DRM scheme is effective in terms of the transmission rate required to send contract information via broadcasting wave. We also demonstrated the feasibility of the DRM scheme by using a prototype system implemented on an SIM card. The DRM scheme enables advanced mobile receiver functions such as pay-per-view with an interactivity channel using communications and a subscription TV such as pay-per-month on mobile receivers without an interactivity channel by transmitting contract information via broadcasting wave.

Advanced Conditional Access System for Digital Broadcasting Receivers Using Metadata

This paper presents an advanced conditional access system (CAS) for digital broadcasting receivers using program-related information called metadata. Digital broadcasting receivers using metadata (DBRM) provide services enhanced by using metadata and content stored in receivers, but it is so easy to edit stored content by using metadata that broadcasters require a content usage control mechanism for DBRM. The advanced CAS provides a secure environment for content and metadata in digital broadcasting receivers by preventing tampering and ensuring that only metadata certified by the broadcaster can be used. To evaluate the advanced CAS, we also developed a smart card and a prototype receiver on a PC. We have demonstrated in an implementation experiment that the advanced CAS can be implemented securely and utilized in broadcasting services using DBRM.

Study of Integrated Services with broadcasting, stored and Internet contents

This paper presents a method for realizing Integrated Services with broadcasting, stored and Internet contents, on the Broadcasting System Based on Home Servers by using metadata. The set of metadata needed for the services and the method of integrated showing using metadata are described.

Advanced conditional access system for digital broadcasting receivers using metadata

We propose an advanced conditional access system (CAS) for digital broadcasting receivers using program related information, called metadata. The proposed advanced CAS provides a secure system for content and metadata on digital broadcasting receivers, by preventing tampering and ensuring that only metadata certified by the broadcaster can be utilized.

A Conditional Access System for mobile broadcasting systems

This paper presents an advanced CAS which provides access control and rights protection for mobile TV content. This advanced CAS can reduce the amount of contract information transmitted through broadcasting. We also demonstrated the feasibility of the proposed CAS by using a prototype system implemented on a SIM card.

Fast generation method of 2D code on DTV receivers

This paper describes our study to develop a fast generation method of a 2D code on DTV receivers using data broadcasting. With this method, a broadcasting station transmits a program code to generate 2D codes. We evaluated the experimental program codes on marketed DTV receivers. As a result, the calculation time for the proposed method was 2–12 seconds, which is 1/9–1/4 that for the ordinary method.

RMP (rights management and protection) system for digital broadcasting based on home servers

This paper presents an RMP (rights management and protection) system for digital broadcasting based on home servers using receivers with home storage devices. This RMP system is suitable for broadcasting, enabling rights protection and advanced access control (term of validity, usage and charge condition, etc.) of stored content on home storage devices.

A downloadable conditional access system for satellite broadcasting

This paper presents is a downloadable conditional access system (CAS) for advanced satellite broadcasting with 4K/8K UHDTV. This CAS can perform secure access control and has security functions such as key data processing and encryption processing that can be securely updated through broadcasting or communications functions. A prototype TV receiver with the downloadable CAS was developed in order to evaluate feasibility of the proposed system.

A digital video scrambling system with variable concealed levels incorporating viewing licenses

In mobile TV with subscription broadcasting systems using wireless communications, streaming-based content services and download-based content services which play back stored content on receivers are being considered. These download-based content services require a function for playing back content in deteriorated video to encourage non-subscribers to purchase content, in addition to a function that allows only subscribers to view content. Therefore, content providers require a digital video scrambling method with variable concealed levels to control the video quality of stored content. We propose a digital video scrambling system with variable concealed levels incorporating viewing licenses. The system can handle H.264/AVC coding content, and the processing load for controlling the concealed level of video is low. We also verify by evaluating video quality and implementation that the proposed system is feasible for actual service.

New File System with Conditional Access System for Removable Media

Digital broadcasting has already been operational in Japan for years. All content and copyrights are protected by conditional access system (CAS). The next new services will be launched in 2007. This is broadcasting based on home servers. Broadcasting of digital content requires access to be controlled. A Secure File System (SFS) was developed to control access with a file system layer. This article describes the SFS, which is an excellent file system to manage security. The SFS commands content to be stored in a personal digital recorder (PDR) and removable media following a newly defined security robustness range. SFS is possible to use with other security application layers presently available. That is, SFS does not conflict with any present security systems with application layers. The data transfer rates with SFS are 10 % lower. These are sufficient to read/write digital broadcasting MPEG2 TS of about 20 Mbps. They were obtained at 10.7Mbyte/sec using an optical disk drive. Index Terms—Digital broadcasting, Home server, PDR, UDF, File system, Removable media