Why it is impossible to fake our 3DShiningFlakes device
Shining flakesThe signature of a 3DShiningFlakes Popims device is constituted by tiny shining flakes. Each of them reflects the light from the flash only in one direction, as a narrow beam. This depends not only of the location of the flake, but also of its inclination and of its orientation. The size of each flake may be much smaller than non-reflecting particles, because the contrast is very important between a flake reflecting light and the environment. It is of course possible to mix different colors of flakes...
There is no technology that would allow someone to organize as tiny particles to produce a signature that is already recorded in the customer database.
A very precise 3D printer could perhaps put optical disruptive in three dimensions, but what is impossible to create is shining flakes (i.e. flat reflective surfaces) that would not only be in the correct location but would also have the right color, the right angle and the right orientation.
Why many security devices are just "difficult to reproduce"
2D devicesMore and more converters know how to print at resolution higher than 10 000 DPI, and counterfeiters can invest a lot of money to develop specific equipment! It is very easy to take a high resolution picture of any 2D device (anything which is just printed with ink), and to replicate it at very high resolution so that a smartphone will never make the difference between a copy and an original.
To be convinced, just count the number of security features on a banknote... if any of them was impossible to reproduce, it would be of no interest to have so many of them on the same banknote.