How to digitally sign PDF with PHP

After some searching for how I could sign a PDF using PHP, I could not find a working solution. Does anyone know how to do this? Or do you know a third-party service that can sign a PDF for us?

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php pdf service digital-signature
Aug 25 '10 at 5:22
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Setasign seems to be offering a commercial solution for signing already created PDF files - http://www.setasign.de/products/pdf-php-solutions/setapdf-signer/sign-pdf.php

Alternatively, TCPDF (Google, it will not allow me to post a second URL), allows you to create signed PDF files on the fly.

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Aug 25 '10 at 9:39
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