Source code, Windows has it as do other types of programs, these are the porperty of the manufacturer. They do the R&D, they spend the money and resources to come up with this stuff. If it was not copyrighted, there would'nt be any incentive to develop. As others have noted, this is NOT like "hacking" the source code on a PC, there are life safety issues involved, would you like to have to explain to the family of someone that was killed due too much knowledge and not enough wisdom?