It still makes no sense to me. If a student has someone else take the course for them (which I am presuming this is trying to prevent), they will just give that person the answers. I have seen plugins (maybe exam security) that will take photos of the student but I am pretty sure they are paid versions. At this point in online education, most places are just concerned about the exam part, knowing that there is no real way to continually verify the student is interacting or is actually the same person.
Authentication
Verification of user at Random Intervals
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