This is especially true because firmware blobs are Some, like Steve Jobs, might describe this as "hardware" control, because it resides wholly within the webcam hardware, but it's still a form of software. Control the light is one of those firmware functions. Webcams have their own wimpy microprocessors and run code directly within the webcam. However, I don't think anybody does this. This would make the light impossible to hack. When power is supplied to the sensor, it should also be supplied to an indicator light. In theory, the indicator light should be a hardware function. Some researchers showed this working on an older Macbook. In recent news, it was revealed the FBI has a "virus" that will record a suspect through the webcam secretly, without turning on the LED light.
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