That message is a built-in Apple notice and is fairly common on campus, and it can be triggered by a large number of events, one of the more common being when teachers use some recording feature on their computers. Canvas has one that commonly trips this alert, but if you search for that phrase in Google you'll see a whole smattering of different things that can trip it. Many users have gotten it at different times, but we don't have a good way to trace exactly what triggers it. Google has been the only tool we've been able to use, and those results have always pointed to it not being a problem. For now, all we can do is pass along the info we have seen on it so far.