1. The PicoTurbo case was actually a loss for ARM. PicoTurbo showed the holes in ARM's patents (specifically prior art and the ability to implement patented functionality differently). ARM paid PicoTurbo millions of dollars to go away.
2. It is important to understand that interfaces (i.e., the instruction set) are not covered under patents or copyrights. ARM patents specific implementations of features mandated by the instruction set; that is how they protect themselves. It is legal to implement the latest ARM instruction set using techniques not covered by ARM's patents.
Replay available now: A handful of emerging network technologies are competing to be the preferred wide-area connection for the Internet of Things. All claim lower costs and power use than cellular but none have wide deployment yet. Listen in as proponents of leading contenders make their case to be the metro or national IoT network of the future. Rick Merritt, EE Times Silicon Valley Bureau Chief, moderators this discussion. Join in and ask his guests questions.