Interestingly, this sort of tracking can come up with false negatives. Imagine a situation in which multiple students are studying together in a group, and they

Interestingly, this sort of tracking can come up with false negatives. Imagine a situation in which multiple students are studying together in a group, and they decide to watch the videos together, on one computer. Only the student that is logged in will be tracked, and the other students might appear as though they haven't watched any videos at all.