I am trying to use the website blog2print.com. When trying to view the book using Adobe it is asking for the document open password. I have no idea what this is nor do I remember setting this type of password. Is this an Adobe thing or is this one of my personal computer settings? I am using a MAC.@
PDFs can have passwords built in, you'd need to find it from the website where you got the PDF
The website where you downloaded your PDFs had those PDFs password encrypted. so that only those people who have the password can actually read these PDFs. You need to contact this website and procure the password (if they are willing to give it to you) in order to be able to open their PDFs.