That error code has frequently popped up on VM and Now TV forums.
Often it's the Windows Snipping Tool that's the culprit, or any other similar program that can take screenshots or record the screen.
Sky are paranoid that people will use it as a means of avoiding a subscription for a second screen.
It can also be caused by Zoom, Skype, Photoshop, nVidia Experience, a browser extension for screen shots, screen sharing, or even a web camera
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