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arbitrary use of photocopiers, which causing compromised, and resulting in leakage of information technology.

It is the use of light diffuse reflectance principle, when you copy confidential documents, important letters and

technical drawings, the copies will be completely black, and unrecognizable.

Currently mainly used for all kinds of confidential documents, such as: technical drawings, scripts, development

reports, business plans, confidentiality maps, design drawings, patents reports and so on.

these paper can be applied in certificate,authentification and the copy will be seen the warning information of "copy void""the copier""void".