| 摘要 |
Disclosed is a security element applied onto printing substrates by printing. The security element includes a code that carries primary information and is detectable to the naked eye in visible light in the wavelength range of 380 to 750 nm, and a code that carries secondary information. The code carries secondary information is combined with the code carrying primary information and is undetectable to the naked eye. The largest dimension in at least one planar direction of the code carrying secondary information is 2 to 40 microns when the security element is applied as print on a printing substrate. The code carries secondary information is non-reconstructable from the print and attributes a statistically analysable feature to the security element. |
