

I would think all the patents have expired but there have been dozens of new instructions added since the 2003 x64. In many cases there are two variants of the same instruction so if a 3rd manufacturer came in they could make their own too. They would need Linux and Windows on board for their variants.


















Arm is not open and requires a license.
https://arstechnica.com/gadgets/2024/10/report-arm-cancels-qualcomms-architecture-license-endangering-its-chip-business/