 <p>You might want to get a command line to modify metadata. Some tools modify both native and XMP metadata.</p> <p>I wrote a blog on metadata editing a while ago: <a href="http://www.barcodeschool.com/2010/09/publishers-fix-the-metadata-in-the-pdf-file/" rel="nofollow">http://www.barcodeschool.com/2010/09/publishers-fix-the-metadata-in-the-pdf-file/</a></p>