<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.