UCLA professor Kal Raustiala and NYU professor Christopher Jon Sprigman's article How to Know a Patent Troll When You See One? You Can't is right-- it is difficult to distinguish whether a non-practicing entity (NPE) is a patent troll. But it is important to try given some important innovators in American history such as the Wright Brothers were NPEs. See CNET's slideshow presentation: How the Wright brothers won the race to invent the airplane (pictures).
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