| 摘要 |
The invention relates to a planar document (100) which comprises: on a first surface (105) of the document, at least one printed mark (110, 115, 120, 125, 130); on a second surface of the document, opposite said first surface, at least one invisible printed mark vertically adjacent to a mark (120, 125) printed on said first surface. In at least one couple of vertically adjacent marks formed on said opposing surfaces, at least one of the marks of said couple has unique content. In certain embodiments of the invention, at least one so-called invisible mark is a two-dimensional barcode and/or at least one so-called invisible mark is a copy-protection mark. According to certain embodiments of the invention, the contents of at least one mark (110) show the position of an invisible mark on the document. |
