Short and sweet. If you’re on PUBLIC property you can take photos. No one can take your camera or ask you to delete your photos.
PLEASE NOTE I’m not a lawyer. The best thing is to consult a lawyer who is a specialist in photographer’s rights.
Check this video out! You will like it!!
http://blog.chasejarvis.com/blog/2012/02/joseph-gordon-levitt-know-your-rights-as-a-photographer/