SEOUL, KOREA- In a situation where major electronic and info-tech companies are mired in high-stake patent infringement suits, auto makers have also increasingly been subject to the attack of so-called "patent trolls." Patent troll is a a company that enforces its patents against alleged infringers in a manner considered excessively aggressive or opportunistic. For so long, the automobile industry has been considered a safe haven from patent infringement disputes. As more and more electronic parts are embedded in a car, however, this is no longer the case.