ルートゾーンKSK/ICANN/延期理由について、ここに記述してください。

The changing or "rolling" of the KSK Key was originally scheduled to occur on 11 October,
but it is being delayed because some recently obtained data shows that
a significant number of resolvers used by Internet Service Providers (ISPs) and Network Operators are not
yet ready for the Key Rollover. 

"a significant number of resolvers" が日本語になると、

• 「リゾルバー（キャッシュDNSサーバー）のうち、相当な割合がKSKロールオーバーに対応できていない」

こうなるのは日本人記者の無理解を示すものとして、苦笑いするしかない。

原文にあたることなく、これを引用するひとたちも同罪。 -- ToshinoriMaeno 2017-10-01 11:39:10

「かなりの数の」「有意な数の」くらいなら、原文の責任と言ってもいいだろう。

実際には観測したうちの5%らしい。

調査方法：

The availability of this new data is due to 
a very recent DNS protocol feature that adds the ability for a resolver to
report back to the root servers which keys it has configured.

理由の推測:

There may be multiple reasons why operators do not have the new key installed in their systems: 
some may not have their resolver software properly configured and
a recently discovered issue in one widely used resolver program appears
to not be automatically updating the key as it should, for reasons that are still being explored.