Patent-holder sues CBS.

A company called Digital Stream IP, LLC alleges that it has a patent for a “Wireless Music and Data Transceiver System” that covers wireless digital audio delivery and display of programming information. To that end, the company is suing CBS Radio for infringement, which happens simply by using a digital audio transmitter, combining multiple streams on a single frequency, and de-modulating the streams back into individual channels. Apparently Digital Stream is hitting its stride, having also sued iHeartMedia for the same thing; several major automotive companies for including digital radios in its cars; and Best Buy for selling digital radios. An anti-“patent troll” group, Unified Patents Inc., has challenged Digital Stream’s patents as obvious, unpatentable, and/or conflicting with prior art and patents. The Patent Trial and Appeal Board has agreed to review the key Digital Stream patent.