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[FYI] Statement Regarding the SDMI Challenge


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Statement Regarding the SDMI Challenge 

The Secure Digital Music Initiative (SDMI) is developing a 
comprehensive system to prevent music piracy. Central to this system 
is watermarking, in which an inaudible message is hidden in music to 
provide copyright information to devices like MP3 players and 
recorders. Devices may then refuse to make copies of pieces of music, 
depending on the meaning of the watermark contained therein.  

In September 2000, SDMI issued a public challenge to help them choose 
among four proposed watermarking technologies. During the three-week 
challenge, researchers could download samples of watermarked music, 
and were invited to attempt to remove the secret copyright 

During the challenge period, our team of researchers, from Princeton 
University, Rice University, and Xerox, successfully defeated all 
four of the watermarking challenges, by rendering the watermarks 
undetectable without significantly degrading the audio quality of the 
samples. Our success on these challenges was confirmed by SDMI's 
email server.  

We are currently preparing a technical report describing our findings 
regarding the four watermarking challenges, and the two other 
miscellaneous challenges, in more detail. The technical report will 
be available some time in November.  

This statement, a Frequently Asked Questions document, the full 
technical report (when it is ready), and other related information 
can be found on the Web at http://www.cs.princeton.edu/sip/sdmi.  

For more information, please contact Edward Felten at (609) 258-5906 
or felten@cs.princeton.edu. 

Scott Craver, Patrick McGregor, Min Wu, Bede Liu
Dept. of Electrical Engineering, Princeton University 

Adam Stubblefield, Ben Swartzlander, Dan S. Wallach
Dept. of Computer Science, Rice University 

Drew Dean
Computer Science Laboratory, Xerox Palo Alto Research Center 

Edward W. Felten
Dept. of Computer Science, Princeton University 

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