I am trying to add a password to a pdf document. I go to "Tools"..."Security"... and that's as far as I can go.
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Go to File - Properties - Security and select "Password Security" under "Security Method". Select your settings, enter your password, and you're done.
This method is not working for me. Neither is the previously successful way of password protecting a PDF doc that I've created myself. At the point where I either Save the doc or Exit & Save - the program renames the file using a number & character hash and tells me it cannot be saved to the folder I've placed it in. This behaviour began after a recent Windows 10 update and persists regardless of logout / login to my PC as well as my Adobe Pro account.
I'm stumped. Also more than mildly annoyed.
Does you use a third-party plugin?
How does you add a password? What version of Adobe Acrobat does you use?
>... the program renames the file using a number & character hash ...
I have never seen this.
One possibility is that you installed some security software that is blocking it. Especially ransomware protection.