Information leakage prevention shield device

Abstract

An information leakage prevention shield device includes a control unit to output a frequency setting signal for setting a filter frequency for an electromagnetic wave emitted from a device, and a modulation signal based on a time variation pattern for sequentially instructing a plurality of different transmission characteristics over time, and a dynamic electromagnetic-wave filter having a filter frequency set by a frequency setting signal from the control unit, having the plurality of different transmission characteristics over time set by the modulation signal from the control unit, to transmit an electromagnetic wave other than the filter frequency set by the frequency setting signal, and to have the plurality of different transmission characteristics over time set by the modulation signal with respect to the filter frequency set by the frequency setting signal.

Dependencies are inferred from the claim text.