Interesting observation about the sale of open source software. "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." Right. Because as Stuart Yeates says, "open source is eroding the nice easy simplifications of copyright law that people have been working by, mistaking their simplifications for law." This is why publishers oppose open content, and want to set up private networks that exclude open content.