MEDIUM PRINTED WITH ELECTRONIC WATERMARK, ELECTRONIC WATERMARK PRINTER, ELECTRONIC WATERMARK DETECTOR, ELECTRONIC WATERMARK PRINT METHOD, AND ELECTRONIC WATERMARK DETECTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a medium in which an electronic watermark is printed, an electronic watermark printer, an electronic watermark detector, an electronic watermark print method, and an electronic watermark detection method that also have a falsification prevention effect by an electronic watermark while maintaining a conventional physical falsification prevention effect and use a printer on market to simply issue a card and a ticket with a highs security level. SOLUTION: An electronic watermark is inserted to a card or a ticket 7 by utilizing a wide area in a pattern or a background. For example, issuer secret information, a purchaser code, a seller code, or a reservation number is used for information inserted as the electronic watermark.