title: What tool or library can check if PDF have biometric signature data
body: <p>My goal is to sign PDF and embed signature biometric data.
  I'll try to use <a href="https://github.com/biosignin/bsi-core" rel="nofollow">https://github.com/biosignin/bsi-core</a> for converting raw biometric data to ISO/IEC 19794-7:2007 format.</p>
  
  <p>Is there any tool or library that I could use to check if new PDFs are having biometric data embedded correctly?</p>