Its not a hack to copy and paste text that is part of the document data. The incompetence of the people responsible to comply with the law doesnt mean its reasonable to label something a hack. Please change the title.
Also had this first thought, but then a hack could just be a way around a limit/lack of authorization, doesn't have to be unknown/sophisticated, so copy of black boxes fits
By serving up the PDF file I am being authorized to receive, view, process, etc etc the entire contents. Not just some limited subset. If I wasn't authorized to receive some portion of the file then that needed to be withheld to begin with.
That's entirely different from gaining unauthorized entry to a system and copying out files that were never publicly available to begin with.
To put it simply, I am not responsible for the other party's incompetence.