CGMS-A and Windows Media Center

CGMS-A and Windows Media Center

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On Tuesday June 10th, 2008, at 10AM PST, Microsoft will release the Cumulative Update for Media Center for Windows Vista (KB950126) that addresses some of the concerns around the CGMS-A flag.   More information around copy protection for television broadcasts can be found on the blog post dated June 4th, 2008.


The update will provide a change in behavior for those users with NTSC,  ATSC and QAM tuners, who connect directly to their antenna or cable feed without connecting through a set-top box.   Content that has been marked as “CGMS-A copy never” will be treated as “CGMS-A copy once” and will be allowed to record on Window Media Center. 


For users with a Digital Cable Tuner connected to a Digital Cable Ready PC, or who are connecting to their Media Center PC via their cable set top boxes, content marked as Copy Never with the CGMS-A flag  will not be able to be recorded in Windows Media Center.  For Digital Cable Tuners with CableCARD, the content protection behavior is defined in the CableLabs specification.  More information regarding this can be found at and referencing the tables on pages 33-36.


Microsoft will continue to work with partners to address issues such as the incorrect marking of content using CGMS-A, and to help us improve the experience for our users.

  • Today Microsoft is will a patch to correct the issues seen in last month’s reported “Broadcast Flag”...

  • Today Microsoft is will a patch to correct the issues seen in last month’s reported “ Broadcast Flag

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