Paradox n. : A tenet or proposition contrary to received opinion; an assertion or sentiment seemingly contradictory, or opposed to common sense; that which in appearance or terms is absurd, but yet may be true in fact.

Example:
What is the Paradox of no causality in time travel?

Taxonomy
Paradox Security Systems, detectors, Access control, control panels, keypads, Motion detectors, Detection, research and development, Burglar alarms, Wireless security, Headquarters, Digiplex, Distributor News, Access cards, Bus Technology, Digital detection, Pet detectors, Proximity access.

Defination from the web:
Paradox Security Systems is a recognized worldwide force in the security industry. ... LCD keypad released. June 29, 2009. Central Security Distribution Appointed Exclusive Paradox Distributor for Australia. May 26, 2009 ...