When I go through lengthy manuals in PDF I often highlight and make notes using post its. These are functions of the Adobe Acrobat reader (latest version). I highlight important pints in yellow and if something is obscure, or relates to my personal universe in some ideosynchratic and overtly warped way, I make a post it note, that attaches to the page.
For some reason Steinberg has dissallowed this function in my copy of the operations manual (Properties/ security tab of Adobe reader)
Could this be part of the next update, it only takes one click from a developer to resolve the matter