title: Protecting custom fonts in UIWebVIew
body: <p>In my app I display HTML content in a UIWebView. The HTML content is downloaded from a server and stored in the iPad's file system to enable offline usage. The HTML uses custom fonts via @font-face in it's CSS file:</p>
  
  <pre><code>@font-face {font-family: 'CustomFont'; src: url(Custom-Font.otf);}
  </code></pre>
  
  <p>To make this work, the font <code>.otf</code> file is also downloaded and stored in the iPad's filesystem.</p>
  
  <p>The problem is, that now the font is available to anyone who can access his iPad's file system (which is really easy if you use something like IExplorer). </p>
  
  <p>This leads to some legal problems, as most font providers do not allow that their fonts are freely distributed (which they practically are when I use this method).</p>
  
  <p>My question: Is there any way, how I could keep the fonts encrypted in the filesystem and decrypt them when the UIWebView tries to load them?</p>