Although I agree in a way, you already have limits to your freedom that you have agreed to tacitly. The differences, for instance, in the technology (from GPS to tanks) allowed to the military and to the citizenry. It is codified, explicit, and everyone seems to agree that it's okay. It's certainly a limit on your freedom, if you want to speak absolutely, but if you don't think it's reasonable, that's a difficult point to make properly.