While shooting my grandchildren at a nearby shopping mall with my big, black, obviously "professional" Pentax K10 a security guard told me that photography was forbidden. This while all about me folks blasted away with point and shoot crapsters and cellphone cams! I ducked into a camera shop within the mall and asked the staff and yes, there was indeed a notice, rather small, at the entry stating that photography was forbidden without express, written permission of the management. The camera shop staff said that it was a real inconvenience since customers liked to try out prospective purchases, understandably, and were often rousted by the officious rent-a-cops. Since then I've shot there and in other malls without problems. "And so it goes" to quote Kurt Vonnegut.