<snip> The issue with John's purpose is that he is taking a picture of the audience(!), and if you take such a picture from the front in a small meeting room, there might a small number of folks end up _prominently_ in the foreground of that picture, at which point their consent will be required. <unsnip> Hopefully, IETF working group meeting participants would be described as more like a jury or legislators than an audience. The purpose of the meeting should be participation and dialog, not presentation.