Adobe PDF

[#1]

I have a pdf file I want to make secure so only certain people can place initials in the document and once they do and save the file I want it to be secure that no one can change the file after it is opened or saved.

[#2]

I have a pdf file I want to make secure so only certain people can place initials in the document and once they do and save the file I want it to be secure that no one can change the file after it is opened or saved.

[#3]

It might be possible with a certificate-based security policy, or Adobe Sign.