title: Signature Timestamp could not verify in Adobe PDF but verified in Foxit Reader. Why
body: <p>I try to sign a pdf file with timestamp. when i open the result file by adobe, I have a mess: &quot;the signature includes an embedded timestamp but it could not be verified &quot;
  But with Foxit reader it verified. Why? Thank so much</p>
  <p><strong>Image result with Foxit</strong></p>
  <p><a href="https://i.stack.imgur.com/SEMPn.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SEMPn.png" alt="enter image description here" /></a></p>
  <p><strong>Image result with adobe</strong></p>
  <p><a href="https://i.stack.imgur.com/1sZ7R.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1sZ7R.png" alt="enter image description here" /></a></p>
  <p><strong>file pdf:</strong></p>
  <p><code>https://llnacademy-my.sharepoint.com/:b:/g/personal/dat_nguyentien_savis_vn/EQ5UGfVHbodGv6OJYWvFZIUBpFNPB10-AJUwhXpce7rkOA?e=a264aM</code></p>