Disable crtl+alt+dell Fedora 16

Someone can help me to disable or change the function default of crtl+alt+del in Fedora 16 ?

[viking777]

Go to 'Activities' mode and type the word 'tweak'. If your menu displays a program click on it, if it doesn't install 'gnome-tweak-tool' and then click on it.

The setting is on the shortcuts tab, settings, log out. Just press backspace to disable it. (which btw I think is a very strange idea, but hey it is your machine! )