title: How to watermark PDF files using thymeleaf
body: <p>How to watermark PDF files using thymeleaf or should I be using iText or other libraries. Would prefer to use thymeleaf, not sure what interfaces are available for that</p>
  <pre><code>// thymeleaf
  implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
  implementation group: 'org.xhtmlrenderer', name: 'flying-saucer-pdf', version: '9.1.22'
  </code></pre>