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Today I was joking around with a co-worked suggesting that customer service should start asking people for their Internet license number when they call in. When they say they don't have one, suggest they search the Net for information on how to get it. So on a lark I Googled "Internet license" just to see what comes up.
Amazingly, the #1 slot (your mileage may vary) was a site where kids can get their very own Internet license after taking a 10-question quiz. I think this should be the gold standard- anyone who can't answer those 10 questions should NOT be allowed on the Internet without supervision!
Gov't eventually kept radio in check by issuing very limited numbers of broadcast licenses, and requiring difficult exams for amateur licenses. A one time the FCC spent a fair about of time policing amateur frequencies to prevent obscenity and other trivial infractions.
Analogies can be drawn between modern email spam and the CB -- unlicensed radio-- craze of the late '70s.