Can iText recognize invisible text in PDF?

Feng Qing <[email protected]> Thu, 30 Oct 2014 11:42:31 -0700
Newsgroups gmane.comp.java.lib.itext.general
Message-ID <[email protected]>
Hello,

I am using iText to parse text from PDF files. I found that some text are returned but are not visible.
For example, I got 
	* “financial derivative” , which does exist on the page
	* “FINANCIAL DERIVATIVE” which is visible, but still returned by iText. In addition, they are not selectable by Adobe acrobat or Foxit.
Does iText has a way to differentiate visible/invisible text? Or does the PDF format has any specification relating to this?

Feng

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