
The font patch well from what I gather
Xbox turns on
Bios is loaded into memory
Dashboard xbe is loaded
this calls on two font files among other files
font files cause an exception error code written into the font files then replaces the public key which is in the xbox's bios in memory (this new public key is know as teh font key) and then loads a specifically named file (prenamed within it's code) that has been signed with the font key
You the xbox bios has been set to only run xbe's (xbox applications) which have been encripted with a public key which matches the one with in itself.
And people seem to be now learning that not only does the code within the patched font files replace the public key in the bios but it also seems to be turning off the media checks on the xbox too.
With the audio patch it replaces the public key in bios with one known as the audio key and I can state that it does indeed remove the media check from the xbox.
Now the off shot of this is that unless you then run something to replace this key or the bios in memory (such as the pheonix bios loader) then everything you want to run (all xbe's) run after the patch has been run have to be encripted with the same public key as the one present in the patch (font, audio etc)