Pls see below. I already entered the password to open and get inside the PDF. I then clicked on Protect, Encrypt, Remove Password. But THAT password I entered, isn't the "Permissions Password". It doesn't work when I typed it below.
If you recommend software, please specify if free. I prefer free.
Please don't just advise me to ask the author. Presume the author doesn't reply to emails, or refuses to remove the password.