After reviewing these boards about integrating iPhone video into a D3, I came across this article. It appears to be both the authentication chip and the pin count/location together. (see this article: http://www.appleinsider.com/articles/07 ... eview.html). This guy comes across as an apple religious nut, but it sorta makes sense. Bottomline is that there is an authentication chip that turns on or off TV Out on the iPod Touch and iPhone, there is also a re-mapping of the pins.