http://geohotps3.blogspot.com/2010/01/hello-hypervisor-im-geohot.html
http://www.engadget.com/2010/01/23/ps3-finally-properly-hacked/
http://en.wikipedia.org/wiki/George_Hotz
The hypervisor is a kind of guardian of the system:
http://wiki.ps2dev.org/ps3:hypervisor
In the words of computer guru Richard Stallman, "a hacker may be the one who enjoys using his full intelligence, without the need to harm a third party." However, at present, the scope of the work of "hackers" exceeds the bounds of simple leisure and recreation.
http://www.bukisa.com/articles/149884_10-great-myths-of-the-hacker-universe