Saw this in the Guardian[1], their app[2] looks really interesting. Anyone here know a little about how they could make the remote redaction work? Obviously you

Saw this in the Guardian[1], their app[2] looks really interesting. Anyone here know a little about how they could make the remote redaction work? Obviously you could just take a screenshot before the sender retracts the message? [1] http://www.guardian.co.uk/technology/2013/apr/30/redact-app-secure-messenger http://www.guardian.co.uk/technology/2013/apr/30/redact-app-... [2] http://www.redactapp.com/ http://www.redactapp.com/