Do Androids dream of freedom? (take 2)

From this thread (Google will require you to login):

The G1 is aimed at end users, not system developers. For user security
reasons the G1 will only accept properly signed system images. I'm not
sure, in this case, who 'owns' the key, whether it is the carrier or
the manufacturer, but one or both of them handle insuring system
images are signed.

Cheers,
Justin
Android Team @ Google

Surprising? Not! Yet another chimera Google wanted people to believe in. And, people, don't point to the OpenMockup. The damn thing does not even do quad-band GSM, let alone 3G, non-withstanding the "port" is not done yet.

(Thanks to mako for the hint)