I think the gist is that I don't really mind students taping in class or conferences, but I'd prefer they ask permission first, mostly to clarify that taping isn't automatically okay. I'm also inclined to specify that they do not have permission to post any recordings (or pictures) of and/or material from class, whether generated by me or at least in part by their classmates, on the internet (I suppose they have the right to post their own work).
So, I'm wondering:
Q. Do others here have such policies on their syllabi? If so, what do they cover? Did I forget anything I should include? Are there any considerations I didn't take into account (I haven't actually checked the laws on secret audiotaping in my state, but will).