Can Acrobat function detect the masked part in PDF?

[KenjiroMajima]

Hello,

Please help me. There are many parts that are masking and I need that list. Can Acrobat function detect the masked part in PDF?  Or compared with the original PDF? Thank you.

Sincerely,

Kenjiro

[Test Screen Name]

Please explain what you mean by "masking" in detail - how you see it, how you detect it, how you know it has happened? What is the connection between the "original" and "current" PDF?

[KenjiroMajima]

mask is a function of Acrobat Pro that fills characters so that they cannot be seen.

[JR Boulay]

"Remove hidden informations" in the Redact tools of Acrobat Pro, can detect any masked element.

[KenjiroMajima]

Thank you for your information. I will confirm this method.

[Test Screen Name]

How do you use this "mask" function? There may be a translation problem. The ONLY way to safely remove characters is "redaction". Every other way to cover characters is easily removed and no protection.