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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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}}</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
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