title: What's the use of "Private DICT Data" in Adobes CFF format
body: <p>As described in Adobes "Compact Font Format" (CFF) specification ( <a href="http://partners.adobe.com/public/developer/en/font/5176.CFF.pdf" rel="nofollow noreferrer">http://partners.adobe.com/public/developer/en/font/5176.CFF.pdf</a> ), theres a "private" font dictionary in CFF compressed postscript fonts (e.g. OpenType fonts with TrueType outlines).</p>
  
  <p>Can someone explain what this "Private DICT Data" in CFF fonts is good for?</p>
  
  <p>And how you can check a font for "Private DICT Data" - e.g. in FontLab Studio?</p>
  
  <hr>
  
  <p><strong>Update:</strong></p>
  
  <p>It seems as if FontLab Studio displays the Private DICT hinting data as follows:</p>
  
  <p><img src="https://i.stack.imgur.com/j0cGc.png" alt="enter image description here"></p>