How to a add timestamp to an online generated pdf document using PHP (Zend_PDF)

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I am generating online a PDF document using PHP and Zend_PDF. How can I timestamp this documents and add a digital signature? It would be okay to use another library for timestamping, as well. Currently I just found commercial products!

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Zend Framework does not support the creation of digital certificates for PDF files. See the following link for more information, along with a link to a free third party solution:

http://www.framework.zend.com/issues/browse/ZF-10950