It's been a while, but I used logging software when my daughters were teenagers. I was very overt about it, I told them it was there and showed them the results (I didn't show them the 2nd hidden log). Think of it as (step)dad looking over his shoulder while using the computer. As long as you are up front about it, I don't see the problem. He can use a computer at school if he doesn't like the rules.
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