If you have problems  playing protected content videos in Windows Store apps then check out KB article 2777760 for some help

“This issue can occur because of video driver issues on your PC. The following scenarios may apply:

  • Your current video driver may not fully support Windows 8 or the playing of DRM protected content.
  • You need to install the update KB2768703 to resolve protected content playback errors in Windows.
  • Your video card may not support DRM by design and may fail if attempting to play DRM protected video on primary or secondary monitors.

Note: Windows 8 video cards require a Microsoft WHQL-certified video driver for your hardware to playback content without restrictions.  At this time many USB video cards do not meet this requirement.  Please contact your video card manufacturer and search for and install the latest Microsoft WHQL-certified video driver for your hardware.”

Check out the full KB article KB2777760 - I receive errors when trying to play protected content videos in Windows Store apps

Get more help for Windows 8 and Windows RT

Rob