| 摘要 |
An original document includes alphanumeric characters defined by an overprinted reflective layer formed on a complex patterned region (12), and having graphic or font size, shape and type coordinated to the particular patterns in the patterned region. The coordination of the overprinted reflective layer with the patterned region (12) is such that if the document is electronically scanned or duplicated by kerographic photocopying, the patterned region (12) will at least partially obscure the alphanumeric characters (14) so that they can only be read with difficulty, thereby comouflaging the text.
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