They have the PCB files and schematics linked from here: https://store-usa.arduino.cc/products/arduino-uno-rev3 https://store-usa.arduino.cc/products/arduino-un

They have the PCB files and schematics linked from here: https://store-usa.arduino.cc/products/arduino-uno-rev3 https://store-usa.arduino.cc/products/arduino-uno-rev3 It says "Arduino Uno is open-source hardware! You can build your own board using the following files" Found some licensing info here: https://support.arduino.cc/hc/en-us/articles/4415094490770-Licensing-for-products-based-on-Arduino https://support.arduino.cc/hc/en-us/articles/4415094490770-L...