A document (1) comprises a latent security image (2) which is visible when the document (1) is reproduced after being scanned by a standard commercial bank scanner. The security image (2) comprises a plurality of lines, dots or spots having a frequency and a density such that the image is reproduced after being scanned by the standard commercial bank scanner. A method of making a reproducible document comprising a security device comprises generating the document by creating an original containing the security device, scanning the original to a digital computer using a conventional scanner, and converting the scanned original to a digital image file which is printable via a digital press, a color copier, etc. A document comprises a security image which is not visible under ordinary light, and is visible when the document is exposed to a predetermined type of light. The security image is printed with an ink visible only under one of UV light, infrared light, X-rays or Gamma rays.
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