The handwriting marked 1. is usually erasable, which makes it a relatively safe signature method. When the information on paper needs to be changed or reused, using a marker pen to sign can reduce the risk of revealing privacy.
2. Tagging signature can mark personal identity information on important documents and distinguish it from other texts. This helps to ensure the security of personal information and prevent others from misreading or unauthorized access to it.
Markers are usually not easy to fade, so they can be used as a way to protect personal information for a long time.
4. The word "mark" usually means "attention" and "warning", implying that this kind of document is more valued than other types of words. This helps others to process this information more carefully and pay more attention to it. To sum up, using markers to sign can protect personal information, because it is a relatively safe way of signing, which is not easy to fade. It can be used as a way to protect personal information for a long time, and it can also mark personal identity information to distinguish it from other texts.