SHEET ELEMENT, BOOKLET BODY, AND ENVELOPE

摘要

PROBLEM TO BE SOLVED: To offer a sheet element that enables the effective prevention of information leak such as of personal information at a low cost. SOLUTION: The inventions refers to the sheet element, the book body and the envelope which has a paper substrate, a bias magnetic field generation source which generates bias magnetic field and a magnetic substance. COPYRIGHT: (C)2009,JPO&INPIT