| 摘要 |
A combined protection system for documents comprising one or more protections selected among an OSI (Overt Security Image) group with apparent security images and/or a CSI (Covert Security Image) group with latent security images, wherein said OSI group comprises: (I) protection against falsifications and colour photocopies based upon adoption of printing processes that, in combination with particular patterns and engravings, utilize the light reflection phenomena to impart different evidence to different particulars of the patterns; (II) protection of the modifiable data by printing different portions of said modifiable data upon portions of the document provided with said different light reflection characteristics; and wherein said CSI group comprises: (I) drawing or embossing those portions of the document it is desired to protect from erasures, particularly those containing numeric data, according to particular patterns; (II) inserting an additional magnetically readable letter or numeral upstream of the standard magnetic band, the letter or numeral being variable according to a personalized algorithm; (III) applying a "sympathetic" ink invisible to the naked eye, adapted to become permanently visible upon contact with particular activating materials; (IV) for documents the negotiability of which should be restrained, irreversibly removing a predetermined portion thereof. |
