With thanks to Rossco and Annie for this one from their recent trip to Angola. This web site states: "Be advised that you take photographs at your own risk... cameras should be used with caution in many areas..."
Further inquiry found this one: http://bradtangolaupdate.wordpress.com/photos/ correctly stating: "Photography in Angola is still a tricky issue. Taking photos of sensitive areas (eg government, military and infrastructure) is probably illegal and could get you into serious trouble if caught. However, technically, there are no restrictions on taking photos elsewhere. This is borne out by this Police photography memo which I lifted from the Internet. It appears to be authentic but I cannot vouch for it. You may wish to print a copy and keep stuffed into your camera case."