| 摘要 |
The invention relates to a security arrangement for a printed product, a security, a document, or the like, which prevents the precise copying of the original product by identifying the copy as non-authentic, and which comprises a protective area 4, 11 and a warning word 1, 10, each printed with a specific line technique which is parallel in relation to the other such that the warning word in the original product is not distinguishable from the protective area to the unaided eye, but that the properties of a copying machine or a scanner cause the protective area and the warning word to copy in ways different from each other, whereby a difference in the degree of blackness or in tone is produced between them, bringing out the warning word in the copy. Furthermore, the invention relates to a method for producing the line pattern of the protective area and the line pattern of the warning word described above and for combining these line patterns into one line pattern image so that, at the outline between the protective area and the letters of the warning word, there is formed according to a specific line technique a transition area 12, where the higher-frequency and the lower-frequency line rulings interlock and where the density range gradually changes. <IMAGE> |
