Hi WSUS Admins,
Soon you will see a new product category family called PlayReady PC Runtime for Windows Media Center. Associated updates for the PlayReady PC Runtime will not be made available to WSUS for synchronizing as they are available only to Windows Media Player via the Windows Update API (WUAPI). You will see the product family, however not the associated product categories or updates. For additional information see: PlayReady.
The WSUS team