Intellectual Property: I've copyrighted the sound of one hand clapping

Composer John Cage's music publisher settled a lawsuit against pop artist Mike Batt alleging that Batt's a;bum track "A Minute's Silence" violated the copyright on Cage's 4' 33", which consists of four minutes and 33 seconds of silence. Nicholas Riddle, managing director of Cage's publisher, told Reuters that Batt paid an "adequate sum," but declined to get specific. Does this mean the settlement contains a nondisclosure agreement? And if it does, won't that violate Cage's copyright, too? Six figure settlement - Battle of the banned - Who is Mike Batt? - What is 4:33?
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