If two MIT students have it their way, physical keys are about to become a thing of the past. At the recent Def Con Hacker Conference, these students announced they've developed a piece of software that enables Schlage Primus keys – the de facto standard of security keys – to be easily replicated with a professional 3-D printer.

Not only does this have far-reaching implications for the world at large, it puts a target directly on the backs of both 3D Systems (NYSE:DDD) and Stratasys (NASDAQ:SSYS). In the video below, Fool.com contributor Steve Heller gives 3-D printing investors the details they need to know about this development.