Security document using secure color pattern and method of preventing copy the security document using secure color pattern

摘要

The present invention relates to a security document using a security color pattern and a copy protection method using the security color pattern. A security document using a security color pattern according to a first embodiment of the present invention includes: a first area on which document contents are printed among a printing surface; and at least one second area on the printing surface in which a first security color pattern composed of a plurality of first colors is formed, wherein the document content includes each of the plurality of first colors and a second security setting pattern preset in the copier. According to a result of sequentially comparing each of the plurality of second colors constituting the , each of the plurality of first colors and each of the plurality of second colors is copied by a copying machine in the CIE L*a*b* color space. It is set to have a lightness index L* value, a chromaticness index a* value, and a chromaticness index b* value, and the document content includes a lightness index L* value, a chromaticness index a* for each of the plurality of first colors. only when the value and the chromaticness index b* value are equal to or set within a predetermined range to the lightness index L* value, the chromaticness index a* value, and the chromaticness index b* value for each of the plurality of second colors , characterized in that it is copied by a copier.