How to password - protect a PDF document that will let me change the security settings?

I want to protect my PDF document (so when I email, it cannot be opened / reading of recipients because it contains confidential/sensitive information) but when I go into the security of documents, I cannot change the method of security (which is currently set at "No Security" - not by me).  There is an icon "View details", but it is grey so I can't click on it.  What can I do to protect this document to be opened by the beneficiaries not compliant?

He seems to have several possibilities.

Using Adobe Reader instead of Adobe Acrobat?

You make a PDF/A file? (It will say so under the menu bar)

Tags: Acrobat

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