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One who participates in an involuntary theft or passive theft;

Thiefery is an action of theft without intent to deny the rightful owner of something of value or with the implied consent of the rightful owner;

An action of theft which provides benefit to the rightful owner;

Any action of theft with the implicit or explicit approval of the rightful owner.
A thiefer doesn't actually steal anything.

by Bryan Johnston February 03, 2008
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