When you take notes on a PDF, the notes are usually intended for you and you alone. Copyedit notes and review notes, by contrast, are intended to be read by someone else: usually a writer, collaborator, or editor.
That’s not to say that the techniques used to copyedit and review a PDF are different from those you use when you take notes. In fact, many of the techniques are the same: what differs are the audience for the notes and the purpose of the notes.
So, take note: before you read the following brief section, I urge you to read Take Notes on a PDF.
In today’s modern society today (as a poorly written student paper I once received said), writers and editors seldom exchange printed copy marked ...