From: Mike N. 

On Sat, 13 Jan 2007 15:02:43 -0500, "Geo."  wrote:

>Possibility, anything over 415000 pixels triggers the problem? Ok new test
>
>1280x324 (414720) plays
>1280x326 (417280) black screen
>1274x326 (415324) black screen
>1272x326 (414672) plays
>
>This seems to confirm it, the black screen appears any time the video
>definition goes over 415000 pixels.

 From the other thread referring to

http://windowsvistablog.com/blogs/windowsvista/archive/2007/01/20/windows-vista
-content-protection-twenty-questions-and-answers.aspx

"  In the case of HD optical media formats such as HD-DVD and Blu-Ray,
the constraint requirement is 520K pixels per frame (i.e., roughly
960x540), which is still higher than the native resolution of content
distributed in the DVD-Video format.  We feel that this is still yields a
great user experience, even when using a high definition screen."

   They identify a trigger point of 520K pixels.  Even translating with a
K=1024, it doesn't quite match the 415000 number.

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