title: How to use iText to add a watermark using an embedded font
body: <p>I've several pdf/a documents with some embedded fonts, now I've to post-process these documents using iText to add a watermark.</p>
  
  <p>I know that it's possible to embed a font with iText:</p>
  
  <pre><code>BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.WINANSI, BaseFont.EMBEDDED);
  </code></pre>
  
  <p>but I would like to use a font that is already embedded in the document to add the textual watermark (something like "SAMPLE COPY").</p>
  
  <p>How can I do it?</p>