True, downloading and installing OS X would be illegal. Depending on what the EULA is, you may not even be allowed to buy releases of Tiger and modify it to work on your PC (as I can almost garuntee Apple has implemented some kind of hardware 'TPM' chip). Of course, this all comes down to what your beliefs are. A lot of games don't let people crack their NOCD, but people still do it. I'm not supporting that you go out and get Mac OS on your PC, but I think it's just ridiculous at how somebody shouldn't be able to do whatever they want with what they brought - and in the case of software, do whatever they wish - as long as they don't distribute it to others without permission.