Security enhanced document and method of making the same
摘要
<p>A document, preferably in the form of a lottery ticket has a security system in which a substrate has thereon an encoded game data portion including a base layer printed with an ink having a first reflectance value as measured by the reflectance of a given wavelength of light and a second layer of ink having a second reflectance value together having an encoded pattern of symbols. The encoded game data portion is covered with a scratch-off layer in which improper removal of the scratch-off layer can be detected through either the change in the reflectance pattern of the encoded game data portion or by an alteration in the encoded pattern of symbols. <IMAGE></p>
申请公布号
EP1277501(A1)
申请公布日期
2003.01.22
申请号
EP20000104905
申请日期
1999.09.29
申请人
OBERTHUR GAMING TECHNOLOGIES, INC.
发明人
LAMBERT, CLAUDE;GOUGEON, FRANCOIS;BOULAY, ROBERT;MONDOU, DENIS;ABRAITIS, JOHN C.;SANCHEZ, CAYETANO III;EHRHART, MICHAEL A.;HUSSEY, ROBERT M.