So much  has changed since the last time we discussed shorter validity periods 
at CAB forum that it'd be worth bringing up again. I think the vocal minority 
opposed the change last time and they may have switched positions by now.

> On Nov 18, 2016, at 7:12 AM, Gervase Markham <g...@mozilla.org> wrote:
> 
>> On 18/11/16 01:43, Brian Smith wrote:
>> The fundamental problem is that web browsers accept certificates with
>> validity periods that are years long. If you want to have the agility to
>> fix things with an N month turnaround, reject certificates that are valid
>> for more than N months.
> 
> That's all very well to say. The CAB Forum is deadlocked over a proposal
> to reduce the max validity of everything to 2 years + 3 months; some
> people like it because it removes a disadvantage of EV (which already
> has this limit), other's don't like it because people like not having to
> change their cert and are willing to pay for longer. Mozilla is in
> support, but without agreement, we can hardly implement unilaterally -
> the breakage would be vast.
> 
> Gerv
> 
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