Pantograph ® is a safety paper technology patented by Document Security Systems that causes words such as “unauthorized copy” or “VOID” to appear when the document is scanned or photocopied.
This Pantograph feature is effective primarily in document-present situations where the original document can be examined by a trained professional or scanned with a specialized 3-illumination ID scanner and analyzed with adequate forgery detection technology.
Usability is challenging as the examination is made not on the physical document but on a photograph or scanned image of it.
Ref.: https://www.perfectcloud.io/resources/glossary/