How to annotate PDF files generated by pdflatex?
Is there a way to annotate pdfs with LaTeX annotations? I mean a pdf that I do not have the source code for (or may not have even been written in LaTeX itself, for that matter).
The motivation behind my question is that I would really like to annotate my lecture notes digitally to stop me losing important notes, but the lecturer does not like the idea of releasing the source code to his notes to students. (i.e. I don't think asking for the source code went down well and I would like to not feel the need to ask another lecturer the same question if I can avoid it :-))
I could try to type them out myself but when time is limited it would be ambitious at best, to try it when there are more urgent work I need to prioritise.
I use linux, my pdf viewer is okular and it mainly for maths/physics type work if that is useful information to add. It would be handy to be able to do it one way or another so I am open to any suggestions that might help out!