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Date: Wed, 7 Dec 2011 23:39:20 -0800 (PST)
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Subject: Re: Insert trusted timestamp to PDF
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:16807

Hi, take a look at this online tool: http://easytimestamping.com

It is able to apply RFC3161 compliant trusted timestamps, issued by accredited Certification Authorities. 

The timestamp is applied to the pdf in detached mode (i.e. as a separate .tsr file)

If you need to integrate the timestamping process in a python app, be patient, we will release an API and a command line version very soon.

--
Marco Rucci
securo.it