It seems that John Baez et al. have shown there is a "no-cloning" (perfect copying) theorem also for the classical domain (classical mechanics). There are several problems, like to define what "classical" means, and what does it mean in terms of classical informations. See points 15) and 16) and 17) of this web-page: http://math.ucr.edu/home/baez/this.week.html