There's several topics and UDFs I've found that create PDF files, but I don't see anything that changes the properties of an existing PDF. I've tried PDFTK and neither update_info or update_info_utf8 change the properties as displayed in Acrobat. We want to file a whole bunch of PDFs of journal articles as references, with the Title property set to the title of the paper, the Author property set to the author(s) names, the Subject property set to the journal reference in an extremely fixed for