“Density Change Copy-Void Pantograph”
U.S. Patents 6,396,927 – 6,665,406
Using heat sensitive ink, a step and repeat message pattern is printed over a Copy/Void pantograph to provide the ultimate in anti-copy protection. Protects against digital scanning or copying. The word COPY or VOID appears when photocopied.
![thermosafe](https://devsite14.com/wp-content/uploads/2020/04/thermosafe.jpg)