Using KEY when F-Secure servers unavailable

I'm currently using LastPass.  It has a complete local copy of my data, and there is an offline-viewer which I can use in the unlikely event that LastPass.com is offline.  I don't see a similar provision to be able to use KEY if the F-Secure servers are temporarily unavailable (e.g. due to DDOS or a routing problem).   Is it possible to use KEY without contacting the F-Secure servers?

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