I think the text is a bit litigious, but my bet is that it is there to help protect the events participants more that BMO itself. Burning Man has had problems in the past with amateur pornographers going to the event to film people naked and then selling the tapes/photos online for profit. This is absolutely against the spirit of the festival, which is still a not for profit event. The money earned off ticket sales just goes right back into funding next years event and to the salaries of a staff of year-round employees. I've seen and posted thousands of pic online and from past events and have never heard of anyone getting a cease and desist letter. As long as you are not trying to sell naked pics, I think you'll be fine.

A kitty hitting keys at random on a keyboard for an infinite amount of time will almost surely download 10,000 child porn images.

This may be a problem seeing that chlorophyll makes them so green and the fact that reflecting sunlight from an organism that uses the sun to create energy is probably not a good idea.

When Congress saw the breadth of their domain, they wept for there were no more taxes to levy.

Think ya used enough dynamite there, Butch?

I've done this exact scenario and can tell you that you should bring things to pass around. Anything computer related. I also scored some hits by connecting computers to things kids are interested in - video games and movies. Explain to them all the technical roles that go into putting together a video game and watch their eyes open wide.