Apparently the pap waited sneakily in the caged off, exclusive parking structure until Rob started taking it all off for his new workout regimen. Once he spotted her peeping he apparently charged the car, manhandled the camera, and ran off with the memory card.
If the paparazzi did actually trespass than that sounds like a pretty slimy thing to do, but stealing is stealing.
Police are currently investigating the matter and if they find that Rob did in fact snatch the goods then he will be held responsible for robbery even if she trespassed.
We'll see what happens in court!