In this post, you’ll learn more about the Error Code 0xC00D28A5 – NS_E_DRM_MUST_REGISTER that is returned when working with the Win32 Windows Media Format 11 SDK
Win32 Windows Media Format 11 SDK Error
0xC00D28A5 – NS_E_DRM_MUST_REGISTER
Win32 Windows Media Format 11 SDK Description
The client must be registered before executing the intended operation.