Q1. Even with Acrobat Pro, you can't unlock and edit a PDF without the credentials the original author saved it with. With Reader it's completely impossible.
Q2. You can do that with CreatePDF, which may or may not be what you signed up for. https://www.acrobat.com/createpdf/en/home.html
Note: If you have Acrobat Pro, you don't really need CreatePDF, except if you need to create PDFs from somewhere other than your home system.