Limes inferior (Latin for "lower limit") is a social science fiction dystopian novel written in 1982 by the Polish author Janusz A. Zajdel. "Limes inferior", one of Zajdel's best-known works, is a dystopia showing a grim vision of a future society resulting from a merger of the two systems competing at the time - communism and capitalism. It is a seemingly free society, which is in fact tightly controlled through a system of electronic biometric ID cards (Keys), censored media and other forms of social control.