Abstract: A method and apparatus for controlling positioning of a user and the user's privacy related information on the mobile Internet includes a location privacy proxy which upon receipt of a request to position a user determines whether a location based service is allowed to position the user. The user retains the right to manually override the rejection of a location based service requesting to position the user.

Abstract: The invention relates to a mask compass comprising a case attached to the outer surface of glass of goggles. The compass box is placed inside the casing. Thus the checking of the compass does not interfere with regular diving movements and e.g. cause deviations from the right direction.

Abstract: A method for recovering copper and/or other non-ferrous metals from sulphidic raw material by roasting the material to a substantially sulphur-free state and then in a separate furnace sulphatize the roasted material into a form of a readily soluble sulphate and/or basic sulphate and then leaching the sulphatized material with an aqueous sulphuric acid solution. Copper and/or other non-ferrous metals are recovered from the spent leaching solution. The leaching solution is after said recovering recirculated to the leaching stage and to the roasting stage.