Invention Grant
US07883762B2 Double sided printed security document 有权
双面打印安全文件

Double sided printed security document
Abstract:
The invention concerns a security document comprising, as security element against recto/verso copying, indicia present on both sides and capable of being viewed under reflected lighting and forming an image capable of being viewed under transmitted light. The invention is characterized in that said indicia comprise lines and form said image with 3D effect.
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