title: Signing PDF with rsa_sha1
body: <p>I'm trying to sign PDF with rsa_sha1(Adobe.PPKLite > adbe.x509.rsa_sha1), and I have two problems/questions:</p>
  
  <ol>
  <li>Don't know if actual PDF content specified by ByteRange should be signed, or digest value of that content?</li>
  <li>Is there a difference if certificate is placed before Signature field, or after?</li>
  </ol>