Takafumi Ueno

DRM renewability & interoperability

Current digital rights management systems employ proprietary methods to protect contents. Hence, they are incapable of interoperation with each other. This causes great inconvenience for users who want to subscribe to contents from different providers. We introduce a new, intellectual property management & protection method (IPMP extension), which enables users to enjoy content services delivered from different providers which are based on individual content protection mechanisms. The method is proposed to ISO/IEC JTC1/SC29/WG11 (MPEG) and the standardization is in the final stage. IPMP is also proposed to DVB-CPT (digital video broadcasting-copy protection technologies). TV Anytime Forum ISMA (Internet Streaming Media Alliance) have adopted IPMP in the ISMA1.0 Encryption & Authentication specification.

MPEG-4 IPMP extension for interoperable protection of multimedia content

To ensure secure content delivery, the Motion Picture Experts Group (MPEG) has dedicated significant effort to the digital rights management (DRM) issues. MPEG is now moving from defining only hooks to proprietary systems (e.g., in MPEG-2, MPEG-4 Version 1) to specifying a more encompassing standard in intellectual property management and protection (IPMP). MPEG feels that this is necessary in order to achieve MPEGs most important goal: interoperability. The design of the IPMP Extension framework also considers the complexity of the MPEG-4 standard and the diversity of its applications. This architecture leaves the details of the design of IPMP tools in the hands of applications developers, while ensuring the maximum flexibility and security. This paper first briefly describes the background of the development of the MPEG-4 IPMP Extension. It then presents an overview of the MPEG-4 IPMP Extension, including its architecture, the flexible protection signaling, and the secure messaging framework for the communication between the terminal and the tools. Two sample usage scenarios are also provided to illustrate how an MPEG-4 IPMP Extension compliant system works.

Variable speed digital signal reproducing apparatus

A variable speed digital signal reproducing apparatus, particularly related to low speed reproduction of a digital signals recorded in a recording medium. The apparatus includes a unit for determining whether a reproduction PCM signal is renewed or not. Based on the renewal determination, PCM data of one frame is stored in a memory and the PCM data is read at a frequency rate corresponding to a tape reproducing speed at that time. Furthermore an interpolating device operates on the read PCM data to produce a PCM signal having the same frequency with which the PCM signal was read from the memory means.

A DTV reception technology using software data streaming on a personal computer

This paper describes a new DTV (digital television) reception technology which relies primarily on software to receive, process and display DTV signals, which realizes an integrated DTV reception card, and real-time MPEG-2 data streaming by software on a PC (personal computer).

HDTV down-conversion using a drift reduction scheme

In the near future of the digital television (DTV) broadcasting, we assume that a standard definition television (SDTV) decoder should have the function of receiving a high definition television (HDTV) signal so that user with SDTV display can receiver HDTV program and display it on its monitor. In order to do so, it is required to convert a HDTV bitstream down to a SDTV signal. In this paper, we propose a fast and memory efficient scheme for the down-conversion. The proposed scheme uses adaptive scalar to truncate the HDTV motion vector for performing half-pel motion compensation (MC) in low-resolution so that the loss in motion vector accuracy will not be accumulated. It saves a lot of computations and requires a smaller memory by performing MC after the down-conversion. The simulation results show that the proposed scheme provides acceptable visual quality while maintaining reasonable complexity.