yes, I have done this with many of my pdf ebooks. You need a handy-dandy freeware program called A-PDF INFO Changer which you can get at
http://www.a-pdf.com/infochanger/index.htm.
If the pdf file is passworded you need to remove the password using PDF password remover v3.0, which you can get at
http://www.softpedia.com/get/Office-...-Remover.shtml before the info changer will work.