“The tape trick keeps hackers from secretly recording you through your laptop’s webcam. It essentially functions as an off button for the camera, physically preventing it from recording until you take off the tape to make a video call. But new research suggests hackers can eavesdrop on those video calls, too, when you think you and the person you’re talking to are the only ones on the line.”
Source: Hackers Can Listen In on Your Skype Calls – Nextgov.com