A Trading Standards officer in a town in the UK contacted the Mozilla foundation to assure it that she'd caught the icky pirates who were copying Firefox without permission. When the Mozzers explained free software and copyleft, the officer lost it -- "I can't believe that your company would allow people to make money from something that you allow people to have free access to. Is this really the case? If Mozilla permit the sale of copied versions of its software, it makes it virtually impossible for us, from a practical point of view, to enforce UK anti-piracy legislation, as it is difficult for us to give general advice to businesses over what is/is not permitted."