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Definition: Webcam blocker

Hardware or software that prevents a malevolent program from capturing the user's face and surroundings as well as any verbal activity. A hardware Webcam blocker is a cover that slides across the camera lens; however, software blockers turn both the camera and microphone off until the user turns them back on. See Webcam.

Hardware Blocker
The simplest approach to blocking the camera is a cover that sticks onto the Webcam and has a slider that covers the lens. However, covers do not prevent a hacker from listening via the microphone.