BeCyPDFmetaedit
From MobileRead
This application is designed to view and modify metadata in a PDF file.
[edit] Overview
This free program loads PDF documents (conforming to specification 1.6) and allows editing of several settings like the metadata about author, title, subject and keywords of the document. Furthermore, one can customize the viewer preferences, the bookmarks, the page labels, the page transitions for slide shows and the encryption/permissions of a document. It supports incremental update mode and can thus be undone. In some cases this tool can even repair a PDF file.
This tool brings up a graphic form for the user interfaces using JavaScript which should be installed. It also has a CLI mode where it can batch modify a list of files.