DNSSEC signatures in the Root and ARPA zones are currently given a validity
period of 10 days.  The validity period is being increased to 13 days, per
the recommendations of RSSAC's Report on Root Zone TTLs [1] (aka RSSAC003).

Note that we are not aware of any cases where the 10-day signature validity
period has caused problems for DNSSEC validators.  This is a precautionary
measure designed to accommodate a worst-case scenario.

This change will be implemented on September 6, 2016.  Please feel free
to contact us at r...@verisign.com with concerns or questions, and to forward
this notice to others who may not have already received it.

[1] 
https://www.icann.org/en/system/files/files/rssac-003-root-zone-ttls-21aug15-en.pdf

DW

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