A fictitious piece of information added to a work of reference
in order to catch information thieves
. The publisher of the work can use the offender's own product as evidence of copyright violation in court.
For example, a map
publisher might add a phony road
or a spurious label to one of its products. If someone publishes a photocopy
of the map, or worse, digitize
s it into a GIS database
, the nonexistent object will appear in the stolen product.
One can imagine a mostly-innocuous software bug being used as a copyright trap.
Perhaps this explains Microsoft. Nahhh....