A photographer friend was shooting industrial-landscape pictures outside a container depot down in Leith a while back when a security officer approached him and told him there were restrictions on photographing the docks area. He said OK and started to put his camera away.

The security bod insisted on inspecting the camera (a digital camera, of course) and said he wanted the pictures of the docks area deleted. My friend argued but eventually agreed and deleted the pictures from the camera's memory.

He went home, plugged the camera's SD card into his computer and undeleted the pictures.