[This American Life] goes into clear detail about the idiocies of the patent system — how even software engineers with patents don’t believe that software processes should be patentable; how patents are regularly awarded for ideas which have been around for years; how multiple patents are often awarded for much the same idea; how IV is essentially running an intellectual-property protection racket; and how big companies are amassing patent portfolios not so that they own the intellectual property behind their products, but rather so that they can threaten to sue any company which sues them
— The cost of patent trolls (by Felix Salmon) about When Patents Attack on NPR.