ThreeBallot receipt ZK? ZI?


If a ThreeBallot (as described in http://theory.csail.mit.edu/~rivest/Rivest-TheThreeBallotVotingSystem.pdf) voter wants a receipt to reveal nothing about how she voted, then she should not choose uniformly among all the bubble-markings that encode her choices. That produces a receipt on which a bubble for her chosen candidate is twice as likely to be marked as a bubble for an unchosen candidate.
Instead, she should mark or not mark each bubble on the ballot to become the receipt according to a coin flip (A biased coin is OK.), then mark the other two ballots to encode her choices.
My question is, does the term "Zero Knowledge" apply to such a receipt? I've only seen "Zero Knowledge" applied to proofs. Is there another term that would be better? "Zero Information"?

--Mike Amling
.

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