"any excuse that they can find to silence their critics and that those governments have responded to the rise of the internet by stepping up their own efforts to control what people read, see, write, and say"
It occurs to me, with Nanotechnology only 8-15 years off, after all the legal maneuvering and appeals, that any legislation that is enacted, will be a moot point by the time it is finalized and implemented.
I wouldn't worry about this to much. A system like this is going to be abused, by politicians, their friends, and families. Even if it isn't, the rumors that it is being abused, are more than enough to cause it's failure.