Document Properties
The Document Properties fields that the metadata editor 
supports apply primarily to Office documents (Word, Excel, etc.). Some fields 
are supported for PDF files, and some document fields also apply to 
image and music files.
  - Authors: This field lets you specify one or more authors 
  of the document.

To 
  specify multiple authors, separate them with a semi-colon (this method of 
  supplying multiple values is used in a number of different metadata fields). 
  Note that when this field is displayed for a music or a video file it is 
  labelled as Artists instead of Authors, and 
  will be grouped with the other Music or Video 
  Properties instead of in a separate Document 
  Properties category. 
   - Category: Specify a category for the document, for 
  example "Documents from my manager". 
  
 - Company: Specify the name of the company that owns or 
  authored the document. 
  
 - Content Status: The status of the document, for example 
  "Draft" or "Final". 
  
 - Content Type: The type of the content, for example 
  "Status Report". 
  
 - Copyright: Specify a copyright notice for the document. 
  
 - Language: Specify the primary language the document is 
  in, for example "English". 
  
 - Last saved by: The name of the person who last saved the 
  document. This is usually updated automatically when you save a document in 
  Word, etc. 
  
 - Manager: In an office setting, the manager of the team or 
  organisational unit that created the document. 
  
 - Subject: A description of the document's subject, for 
  example the name of the project it is being written for. 
  
 - Title: The document's title.