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Niels Ferguson has found a weakness in the HDCP content protection system. However, he can not publish the results due to DMCA issues. He has written a paper regarding this issue here:

Censorship in action: why I don't publish my HDCP results
http://www.macfergus.com/niels/dmca/index.html


"HDCP is fatally flawed. My results show that an experienced IT person can recover the HDCP master key in about 2 weeks using four computers and 50 HDCP displays. Once you know the master key, you can decrypt any movie, impersonate any HDCP device, and even create new HDCP devices that will work with the 'official' ones. This is really, really bad news for a security system. If this master key is ever published, HDCP will provide no protection whatsoever. The flaws in HDCP are not hard to find. As I like to say: 'I was just reading it and it broke.' "
http://www.macfergus.com/niels/dmca/cia.html
 
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