I once heard a story about Microsoft: a research group had discovered that they could control the radio-frequency emissions of computers with code, and could br

I once heard a story about Microsoft: a research group had discovered that they could control the radio-frequency emissions of computers with code, and could broadcast the license serial number of running software. Unfortunately, the signal was too weak to detect unless a large number of computers were broadcasting the same license number. But you could easily discover companies that were illegally sharing licenses by driving a radio equipped van around the business district. (I probably have most of the details wrong; it's been years.) Anyway, the punchline was that Microsoft wasn't interested because it wouldn't catch all illegal licenses.