As a privacy-minded computer science student preparing to start his first year at Miami University, Erik Johnson was concerned this fall when he learned that two of his professors would require him to use the digital proctoring software Proctorio for their classes. The software turns students’ computers into powerful invigilators—webcams monitor eye and head movements, microphones record noise in the room, and algorithms log how often a test taker moves their mouse, scrolls up and down on a page, and pushes keys.

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