As a former Apple employee, I know just how seriously Apple takes its secrets. Even today, years after my NDA has expired, I'm reluctant to talk about things that Apple flagged as confidential. One reason for that reluctance is because of the respect I have for the company and my friends who still work there, but of course another part of it is I don't want to make anybody there angry.
But not all past employees are like me. And over at Quora there's a very interesting thread where past Apple employees talk about what it takes to keep the company's secrets. Interested readers should check out the thread in its entirety, but here's one of my favorites (this from an anonymous Apple employee):