Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Takuyo Kogure

Sheng Mei Shen

Takanori Senoh

Ming Ji

Hidemasa Kitagawa

Masatoshi Shimbo

Toshiyuki Goto

An apparatus for a flexible and common IPMP System (Intellectual Property Management and Protection) offers flexibility and interoperability by incorporating a complete IPMP Tool List stored in the content stream or downloaded from a URL location. The IPMP Tool Manager of a compliant IPMP terminal functioning as a preprocessor module is provided, the IPMP Tool List is parsed, and an IPMP Tool is acquired based on the IPMP Tool ID, related location identifier, and IPMP Tool Format ID. The IPMP Tool can be precompiled to a binary format and sent or downloaded to the IPMP terminal, and different binary formats are prepared by the content provider for use on different IPMP terminal platforms.

Apparatus and method of flexible and common IPMP system for providing and protecting content

A method for appropriately defining standards for implementing an MPEG-n intellectual property management and protection (IPMP) system introduces IPMP Tool Information located at the beginning of the content stream, and an IPMP Tool management function as a pre-processing module located at the start of the content decoder, and retrieves IPMP Tools based on the IPMP Tool Information. To improve security and enable interoperability between terminals in different IPMP systems, a two-layer security structure and user authentication output format are further defined. Implementation on terminals of different complexity is enabled by further defining different profiles for IPMP Tool retrieval.

Content distribution/protecting method and apparatus

A magnetic recording and reproducing apparatus for recording a signal on and reproducing it from a magnetic tape comprises an automatic A.C. bias adjusting device for increasing an A.C. bias current to be superimposed during recording of the signal at a predetermined rate and differentiating the reproduced signal by time to automatically establish an optimum A.C. bias, and a record compensation device for recording and reproducing an adjusting square wave, separating a fundamental frequency component of the square wave from a harmonic component, comprising both components to determine a ratio of them and adjusting a record compensation frequency characteristic in accordance with the ratio.

Automatic signal compensation recording and reproducing apparatus

Automatic tape bias adjusting and signal compensation recording and

A sound reproducing system for reproducing sounds from two loudspeakers located in front of a listener comprises a difference creating network for causing a ratio of sound pressures applied to left and right ears of the listener and causing a time difference between sound waves thereat by a sound radiated from a sound source located at any point around the listener, and a front and back recognizing network provided in common with both ears for cancelling information which causes the listener to feel that said loudspeakers are located in front of the listener and enabling the listener to localize a sound image at any point, whereby the listener can localize the sound image at any point around the listener while he is listening the sounds radiated from the two loudspeakers located in front of him.

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Neyagawa, Japan

Takuyo Kogure