I create many pdf files in LaTex through emacs/auctex. I can't use the "Comment and Markup" toolbar in Adobe Reader, presumably because the security properties show exactly that.

Can someone explain to me what I have to do to be able to annotate my own pdf files in Adobe Reader?

I emphasize that these are my files that I wish to deal with, not someone else's. I'm not trying to violate any drm or property rights.