Information handling system incorporated with an information security measure.

摘要

In an information handling system such as an information recording system and an information communicating system, illicit use of the information, which is normally recorded in a medium or is being communicated, is effectively prevented by requiring decoding information for the use of the information. The medium for carrying the decoding information is provided separate from medium used for the information to the handled. Alternatively, the decoding information may be recording in a medium provided in a key which allows operation of a part of the system. Preferably, the decoding information is recorded in regions of hologram, diffraction grating or light polarizing material.