Microprint Signature Line – The words “Authorized Signature” repeated in tiny, type, so small that the letters blur to a dotted line when copied or scanned. The distinct “MP” near the signature line alerts the recipient to look for legible little words.
This Microprint Signature Line 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 in online and mobile onboarding situations 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/