| 摘要 |
A security element is provided for a document of value. The security element comprises an array of apertures through at least a portion of the document of value, the arrangement of apertures relative to one another forming an observable data item. The array of apertures comprises apertures of at least two different shapes or orientations, the occurrence of the different shapes or orientations within the array representing an encoded data item. Also provided is a method of manufacturing a security element on a document of value, comprising: obtaining a first data item and generating an aperture array template, the apertures in the array template being arranged such that the first data item is observable from the arrangement of apertures; obtaining a second data item and encoding the second data item within the aperture array template by assigning one of at least two different shapes or orientations to each of the apertures in the array template according to a predefined algorithm, whereby the encoded aperture array template comprises apertures of at least two different shapes or orientations, the occurrence of the different shapes or orientations representing the second data item; and perforating at least a portion of the security document according to the encoded aperture array template. |
