– How do authorities check if you’re watching TV without a licence in the UK?
In: Technology
They used to be able to detect the [colorburst crystal frequencies](https://en.wikipedia.org/wiki/Colorburst) if you had an old TV. Black & white TV’s had their own particular frequencies, also.
Not sure how they’d do it with today’s TV’s and/or computers, but it’s probably something similar.
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