Certify PDF with Java

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I am developing a GED (Electronic Document Management) system in Java Web. In this system I need to have a PDF certification feature, in which the A3 model certificate will be used. I have no idea how to do this. Someone can help me?

  • Explain the problem better. Have you researched anything? What is this "A3 certificate"?

  • I searched but I didn’t get any clarification. Here’s the thing... For a digital file to have legal value, it needs to be digitally signed. This signature comes from the digital certificate. This certificate has some models, the A3 is also called token, in which it looks like a pen drive. I need to create a system feature that can access the certificate, grab your key and sign the document.

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