PdfReader.getInfo returns null for Keywords

I am creating a new Pdf from an existing Pdf ( original ) and add customized
pages on top of that Pdf. I am able at this moment to retrieve metadata from
Pdf by using: info = reader.getInfo(); However, when I want to get the value
for "Keywords" info.get("Keywords") it is returning null; When I go through
the map and look at the key-value pairs returned I do not see the key:
Keywords. However, the Pdf ( original ) has value for Keywords. 
*Question*: How do I get the value for keywords which is present in the
metadata section of the original Pdf?

*Sample Code:*
// Step 2.5 Copying Pdf Properties.
			reader = new PdfReader(secondFile);
			HashMap<String, String> map = reader.getInfo();
			
			String title = map.get("Title");
			String author = map.get("Author");
			String subject = map.get("Subject");
			String keywords = map.get("Keywords"); ------------> This one returns
null for the original Pdf.
<http://itext.2136553.n4.nabble.com/file/n4661008/Screenshot_%2829%29.png> 
<http://itext.2136553.n4.nabble.com/file/n4661008/Screenshot_%2830%29.png> 
			String creator = map.get("Creator");
			
			if (title != null)
				document.addTitle(title);
			if (author != null)
				document.addAuthor(author);
			if (subject != null)
				document.addSubject(subject);
			if (keywords != null) {
				document.addKeywords(map.get("Keywords"));
			}


Any help will be appreciated. 

Thanks.



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