How to embed a signature in the PDF file with Java?

Hello All!
There is no problem to sign a PDF with Java for me. But how to embed this signature in the PDF. I really don't know. I've found the PdfSignature class in the iText lib. But it is poor.
I've read on the another forum: "If you want to do server-based signatures, there is only one option - SecurSign http://www.appligent.com)."

How to sign a PDF using iText

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