I suspect many off the shelf cables, even ones from the reputable manufacturers are not patented. Most, if not all purchase metal and have it drawn by the same few companies, nothing to patent, the connectors and dielectrics mostly the same. This leaves design, and many of these cables use common designs, only so many designs available.
While Cardas may have patents, lets see the whole list of cable manufacturers with patents. Until its proven they have both patents and offending cable is indeed being marketed as the 'real' deal, we don't have patent theft and/or consumer theft. If being marketed as counterfeit cable no one's being fooled, they know exactly what they're purchasing, a counterfeit cable. And does one really expect they're getting an exact copy with counterfeit cable, I presume not.
I've been constructing some of my own power cords and IC's for a number of years now, the wire, dielectrics and connectors are exactly what is used in some name brand cables, I know this because some of these parts come from manufacturers who design and sell their own line of cables. This only leaves design, assume design I'm using is exact duplicate of some off the shelf design, after all, how many proprietary designs are possible with the limited number of parts that make up audio cables. Point is, if I can do this, so can Chinese, how do you know what they're doing is in fact patent infringement, they are likely doing the same as I, only difference marketing and selling as counterfeit.