The 'Place Additional Information Into the Document' (top left check box) allows the user to specify.
what additional information to include PDF Information for the documents created with PDF-XChange.
You can put in additional information such as:

Title: Allows a title for the document. All the documents created with the PDF-XChange, will have this title by default unless edited later.

Subject: Enter the subject of the documents. As with the Title value, all documents will have this subject until updated subsequently again.

Author: The Document Author, may an individual or Company etc.

Keywords: Enter here the keywords for documents which can significantly enhance search returns through large PDF document volumes.

Creator: The creator of the document. This can be the same as the Author value or a department etc within your organisation.

Producer: This field denotes the software producing the PDF files (PDF-XChange) and its version.