What's actually needed is a secure time stamping service. You can read about those at: http://en.wikipedia.org/wiki/Trusted_timestamping http://en.wikipedia.or

What's actually needed is a secure time stamping service. You can read about those at: http://en.wikipedia.org/wiki/Trusted_timestamping http://en.wikipedia.org/wiki/Trusted_timestamping A personal favorite which I highly recommend is the following: http://www.itconsult.co.uk/stamper.htm http://www.itconsult.co.uk/stamper.htm Under normal circumstances, one would need an expert witness to authenticate the signature, but in several jurisdictions which enacted digital signature laws statues, that may not be necessary depending on the evidentiary status of e-signatures.