MSWord - readonly and protected, what's the difference?

[pickarooney]

I'm trying to get a line of code right, but am having trouble understanding the difference between these two things.

Basically, I want to say, "if the document is readonly, remove the readonly property".

If ActiveDocument.ReadOnly = True Then
        ActiveDocument.Unprotect
    End If

This doesn't work as apparently the file is readonly but not protected.
Readonly is an unassignable property, so it's not possible to declare
ActiveDocument.Readonly = False