| 摘要 |
A security document is provided comprising a substrate having a top surface for carrying printed indicia. Background printed matter is printed on the top surface. The background printed matter is made up of a pattern of background elements. A security term is also printed on the top surface of the substrate. The security term is composed of a pattern of security term elements. The background elements or the security term elements, or both, are organized in a non-orthogonal, repetitive pattern. Also, either the background elements or the security term elements are not readily duplicated by a color copier while the other elements are readily duplicated by a color copier. This results in a visually perceptible security term being produced upon a copy of the security document. The security document is "imaging friendly. |
