An organization called the Electronic Frontier Foundation, which works to protect small businesses and entrepreneurs by seeking to block or reverse patents by larger corporations of things that shouldn't be patentable, is going after some of Stratasys' (SSYS -1.45%) and Panasonic's (PCRFY) patents related to 3-D printing. In the following video, Motley Fool industrials analyst Blake Bos tells investors which patents may be at risk, and how investors should think of this conflict in terms of their investing theses in this space.