Is this the first ever practically-deployed use of a threshold scheme?

[Peter Gutmann]

Apparently the DNS root key is protected by what sounds like a five-of-seven
threshold scheme, but the description is a bit unclear.  Does anyone know
more?

(Oh, and for people who want to quibble over "practically-deployed", I'm not
 aware of any real usage of threshold schemes for anything, at best you have
 combine-two-key-components (usually via XOR), but no serious use of real n-
 of-m that I've heard of.  Mind you, one single use doesn't necessarily count
 as "practically deployed" either).

Peter (who has two more Perry-DoS-ing conversation-starter posts to make, but
       will leave them for awhile now :-).

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