Silverlight for Macintosh:

SUPPORT SOLUTION:
In some cases, attempting to play a video containing DRM-protected content can occasionally fail and cause an error message to be returned.Attempting to use Silverlight 4 or earlier to play a video that is DRM-protected can result in playback failing with an error. The failure is not machine configuration or locale dependent. Types of content that can result in playback failure is also unpredictable..CauseThis is due to an issue affecting the Silverlight runtime caused by a failure during license acquisition.ResolutionThis issue has been corrected and the fix will be included in the next Silverlight 4 servicing release.Additionally, the error can be resolved by closing all open browser windows, then restarting the application and attempting to play the video again..Note This is a “FAST PUBLISH” article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use
(http://go.microsoft.com/fwlink/?LinkId=151500)
for other considerations..

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