There're two kinds of hologram hidden text or images available for hologram sticker which increase hologram sticker security capability agaist counterfeit strongly. These two kinds of hidden features are made by hologram directly, not other kind overprinting such as UV hidden text and Thermo changing hidden text .
First type of hiddnen text in side hologram sticker is Laser Beam Reveal Hidden Text in Hologram (laser readable hidden text image), which also called laser beam hidden text. This kind of hidden text of image on hologram sticker just can be seen with help of laser pointer (laser reading pen).
Another type hologram hidden text called Mole hidden text which has to see hidden text with help of Decode film. We can read simple text of image once we cover some area of sticker by this piece of Decode film.
More Encryption Hologram:Morse Encryption Hologram
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