----- Original Message ----- From: "Jari Arkko" <jari.arkko@xxxxxxxxx> To: "Joe Touch" <touch@xxxxxxx> Cc: "Richard Barnes" <rlb@xxxxxx>; <ietf@xxxxxxxx> Sent: Wednesday, June 03, 2015 4:55 AM I am not sure the discussion about blocking is relevant. We will change defaults, but cleartext is still available. <tp> I note that the statement makes TLS 1.2 a MUST and earlier versions of TLS a SHOULD NOT. In practical terms, what levels of browser will we be required to have in order to be able to use TLS 1.2? Tom Petch Jari