Article ID: 2768674
You may receive one of two errors when you try to sync or play a video file on your Windows Phone 8:
The video is protected with Digital Rights Management (DRM). Windows Phone 8 currently doesn't support videos that use DRM.
Windows Phone 8 supports video without DRM, and many streaming apps are available in the Windows Phone Store . If you'd like to see video DRM support added, please go to the Windows Phone Feature Suggestions website and make requests for future releases.
To learn more about playing videos, go to the Music and videos FAQ page on the Windows Phone 8 How-to website.