Hot stamp foil is fused onto a host surface by means of heat and pressure, other holograms are named cold stamp hologram.

It is require specified devices which are designed for this purpose.

If you visit capabilities menu, you will see, all kinds of hologram have specified characteristics, If you know about them you can identify counterfeit hologram.

Yes, as you see in capabilities menu, one of specification in hologram is hidden image, which can be seen through specified device. For more information refer to other products menu.

Hologram is very difficult to copy. Generally what passes as copies of holograms are not holograms at all, but diffractive material with screen printing and or hot stamping with various foils. To the untrained eye they appear like holograms because they have some form of rainbow colors. They are crude pass offs that do not stand any scrutiny and cannot be called holograms. Holograms cannot be copied by any known printing technique.