Whoever makes it, tells it not; whoever takes it, knows it not; and whoever knows it, wants it not. What is it?

Common Wrong Answers
“Real money”
Real money is made and used openly; the riddle specifically describes something that is made but not disclosed.
“A secret”
A secret is something that can be told or shared, unlike the item in the riddle, which is not shared by its maker.
“A lie”
While a lie may not be desired by those who know it, it can be told openly, making it inconsistent with the riddle's conditions.
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