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Cliff Wells wrote:
> I am
> unable to see why someone shouldn't be able to receive a signed PDF via
> email and achieve a similar level of confidence that the signor was
> legitimate.

BTW Canonical does exactly that[1]. I've just recently signed their CCA 
which consisted of downloading a PDF from the site and sending it back 
to them with the words like "I agree with this".

[1]: http://www.canonical.com/contributors