I'm not sure where the presumption originates that classroom spaces are closed and private. It feels odd to me to think of learning as being more akin to a session with a psychologist than to an open discussion in Plato's agora. And the argument that students need 'safe spaces' seems to me to legitimize the harm caused were their discussions open and public. I don't disagree with privacy, but I do disagree with the presumption that classrooms are and ought to be private. In education especially, 'closed' should be the exception, not the rule. At any rate, the presumption causes issues with respect to classroom recordings, which is the subject of Lorna Campbell's post here and the more in-depth webinar to which she refers. There's no transcript, sadly, but there is a useful list of resources.