What is this owner’s password I need to access my documents in order to save them

You will need help from whoever sent that document to you.

It appears that you accessed a form from the U.S. government that does not allow you to save it. No one here would know who the "owner" is, let alone the correct password. I suggest that you contact the governmental agency that provided you with this forum for further assistance.

The problem appears to be with the type of device you're using to fill out the form.

I located the official U.S. gov page this form is on:

https://www.uscis.gov/sites/default/files/document/forms/i-9-paper-version.pdf

It is secured, but everything is open except for extracting page content.

Trying it on both my 2022 iPhone SE and Mac Mini, I had no issues at all filling out the form within Safari on the Mac, or opening it in a PDF editor. From the iPhone, though, I couldn't do anything with it. Not even after following their link for what is supposed to be a mobile version of the file.

I have exactly the same problem and go crazy!

I had this issue with 2 different .pdf sources one also was one from the government (Australia).

Every time I save the file it does ask me for the owner password which is definitely non of mine!

I tried it on my phone and the mac (in both cases, I downloaded the file from the original homepage.

The exactly same files on my wife's laptop, downloaded from the same source don't have that problem that a password need to be entered...

In my opinion it's either a setting I don't know, can't find or some sort of bug.

The help function in review is also useless as well as all the forums I looked through...

Can anyone help?