I'm receiving more and more pdf files from book publishers. These books, I need to annotate. Even for protected (from annotating, they say; no PW required) documents, we can annotate them. Problem is, we can't export them as PDFs, as far as I know. So, is there a way to 'Unprotect those books', or simply an app that would allow me to export an annotated protected file? (Important: I do not need a pdf reader recommendation, simply which one could do the exporting for protected files; can't seem to find one). Thks a bunch!