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The '''security of [[Advanced Access Content System]]''' (AACS) has been a subject of discussion amongst security researchers, high definition video enthusiasts, and consumers at large since its inception. A successor to [[Content Scramble System]] (CSS), the [[digital rights management]] mechanism used by commercial [[DVD]]s, AACS was intended to improve upon the design of CSS by addressing flaws which had led to the [[DeCSS|total circumvention of CSS]] in 1999. The AACS system relies on a [[Tree (set theory)|subset difference tree]] combined with a [[
Even before AACS was put into use, security researchers expressed doubts about the system's ability to withstand attacks.
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| style="background:#EAEAEA;"| '''[[
| No
| Yes
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Microsoft later claimed that the paper contained various factual errors.<ref>{{cite web|url=http://windowsvistablog.com/blogs/windowsvista/archive/2007/01/20/windows-vista-content-protection-twenty-questions-and-answers.aspx|title=Windows Vista Content Protection - Twenty Questions (and Answers)|url-status=dead|archiveurl=https://web.archive.org/web/20130121121652/http://blogs.windows.com/windows/archive/b/windowsvista/archive/2007/01/20/windows-vista-content-protection-twenty-questions-and-answers.aspx|archivedate=2013-01-21}}</ref><ref>[[Peter Gutmann (computer scientist)#Criticism of Peter Gutmann.27s analysis of Vista DRM]]</ref>
While great care had been taken with AACS to ensure that content was encrypted along the entire path from the disc to the [[display device]], it was discovered in July 2006 that a perfect copy of any still frame from a film could be captured from certain [[Blu-ray]] and [[HD DVD]] software players by using the [[Print Screen]] function of the Windows [[operating system]].<ref>{{cite web
| url = http://hardware.slashdot.org/article.pl?sid=06/07/07/1255224
| title = Work Around for New DVD Format Protections
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|last=Yam
|date=2007-01-17
|work=DailyTech
|archive-date=2007-02-19
|archive-url=https://web.archive.org/web/20070219103102/http://www.dailytech.com/article.aspx?newsid=5747
|url-status=dead
}}</ref>
The Processing Key for the first Media Key Block version, which could be used to decrypt any AACS protected content released up to that point, was found and published on the Internet at the [[Doom9]] forums. AACS Licensing Authority sent multiple [[DMCA takedown notice]]s to web sites hosting the key.<ref>{{cite web
|url=http://www.chillingeffects.org/notice.cgi?sID=3218
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}}</ref>
On April 16, 2007, the AACS consortium announced that it had revoked the Device Keys used by both Cyberlink PowerDVD and InterVideo [[WinDVD]], and patches were made available for users which provided uncompromised encryption keys and better security for the keys.<ref>{{cite web
|url=http://www.aacsla.com/press/
|title=Press Messages: AACS - Advanced Access Content System
|accessdate=2007-05-02
|archive-date=2007-04-30
|archive-url=https://web.archive.org/web/20070430070403/http://www.aacsla.com/press/
|url-status=dead
}}</ref>
<ref>{{cite web
|url=http://dailytech.com/AACS+Responds+to+Cracked+HD+DVD+and+Bluray+Disc+Protections/article5879.htm
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=== Media key block renewals ===
{{Expand section|with=missing details, especially media key blocks #13–#64|small=no|date=December 2022}}
{| class="wikitable"
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| [[AACS encryption key controversy#2009|12]]
| ''[[Body of Lies (film)|Body of Lies]]'', [[Baraka (film)|Baraka]]
| 2008-10-09
| 2009-04-06<ref>{{cite web |url=http://forum.doom9.org/showpost.php?p=1270338&postcount=156 |title=Disc using MKBv12 decrypted
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| ?
|}
==See also==
* [[AnyDVD]]
==References==
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