Editorial contents of the arduino.cc website, such as texts and photos, are released as Creative Commons Attribution ShareAlike 3.0.
This means you can use them on your own derived works, in part or completely, as long as you also adopt the same license. You find the complete text of the license here.
Arduino brand, Arduino logo, design of the website and design of the boards are copyright of Arduino LLC and cannot be used without formal permission. For informations about the right way to use them, please write to firstname.lastname@example.org