Not true. Freedom of speech in the US prevents the US government for levying consequences against you for what you said. This is not the case in North Koreas
That's only because they couldn't care less what you or I say most almost all of the time.
Instead, democratic governments (especially violence-shy Western ones) use the Official Secrets Act [or local equivalent] to prevent the people that are privy to information the governments do care about from ever talking about it.
Instead, democratic governments (especially violence-shy Western ones) use the Official Secrets Act [or local equivalent] to prevent the people that are privy to information the governments do care about from ever talking about it.