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Secure Digital Music Initiative : ウィキペディア英語版
Secure Digital Music Initiative

Secure Digital Music Initiative (SDMI) was a forum formed in late 1998,〔Leonardo Chiariglione: (Riding the Media Bits. Opening content protection ) chiariglione.org, 2003〕 composed of more than 200 IT, consumer electronics, security technology, ISP and recording industry companies, as well as Authors, Composers and Publishers Right holders (represented by CISAC and BIEM representatives, mainly from SGAE/SDAE, GEMA, SACEM/SDRM, MCPS/PRS, ASCAP, BMI, SODRAC), ostensibly with the purpose of developing technology and rights management systems specifications that will protect once developed and installed, the playing, storing, distributing and performing of digital music.
Specifically, the goals of the SDMI were to provide consumers with convenient access to music online and in new digital distribution systems, to apply digital rights management restrictions to the work of artists, and to promote the development of new music-related business and technologies. SDMI was a direct response to the widespread success of the MP3 file format.〔
According to their web site, SDMI existed to develop “technology specifications that protect the playing, storing, and distributing of digital music such that a new market for digital music may emerge”
==Method==

The strategy for the SDMI group involved two stages. Firstly to implement a secure digital watermarking scheme. This would allow music to be tagged with a secure watermark that was hard to remove from the source audio without damaging it. The second stage was to ensure that SDMI compliant players (see the SDMI Portable Device Specification) would not play SDMI tagged music that was not authorized for that device. The reasoning was that even if the files were distributed they could not be played as the device would detect the music was not authorized to be played on it.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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