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According to Wiktionary, disclosure's etymology comes from Latin dis-+clausus, literally away+enclosed.

I wonder why do the term closed is not in common use as the term undisclosed.

Not Not True is simply True, and Not Not False is Simply False (!!1==1)

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up vote 11 down vote accepted

Etymology is not the same thing as definition. Disclosed does not mean not closed. Undisclosed means “not made known or public”. Closed means “not open”.

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