Security of Advanced Access Content System: Difference between revisions

Revision as of 20:05, 18 December 2023

Latest revision as of 04:53, 19 May 2025

(One intermediate revision by one other user not shown)

Line 62:

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

Line 125:

|last=Yam

|date=2007-01-17

|work=DailyTech}}</ref>

|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

Line 166 ⟶ 170:

}}</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}}</ref>

|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