Sounds more like snake oil, than a patent application.
Given the
description, I suspect that the prior art can be found in the PGP +
Telix +
the Telix extension that deleted email every hour combination.(?I think
that
hourly was the default setting. It was user configurable.) This was circa
1990.
I have a recollection of a procmail recipe that did something
similar. That
would have been circa 1997.
Granted, both of those
delete content on one side only. At least one beta
tester stated that had the
tech been available in 2006, they would have
avoided an unpleasant experience
at the hands of a government agency.
The tech was available but did require
some user sophistication to set up.
There is a Thunderbird extension
that deletes email on both the sender's and
recipient's side, if both users
have installed the extension.
The big issue is whether or no people will
use these privacy enhancing tools.
My bank, for example, is
pathologically committed to http, in the grounds that
https is "insecure", and
"unreliable" (Seriously, that is what IT told me.) They
are equally unable to
send encrypted email.
Likewise, despite HIPPA requiring secure
transmission of data, none of my
doctors, nor any of the hospitals, government
agencies, doctors,
psychologists, surgeons, and advocates are able to send
anything encrypted.
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