Nothing to see here. Any major company has such a policy document. Any major company will have regular training so that employees behave in the right way. Not having such a policy and training would be incredibly dangerous legally. And most companies would have some kind of video unless the CEO is so hated that a video showing him would be a turn-off.
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I wouldn't feel comfortable or safe working for Apple. The company is built around the values of a man who seemed to have some sort of anti-social personality disorder.
We all feel a lot better knowing you don't work at Apple.
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So no one spoke up when the plan to put 1Gig or RAM in the iPad air was revealed?
No, because Apple doesn't hire Samsung trolls
Most of the complaints about RAM actually come from some people with "just enough knowledge to be dangerous" who misinterpret the way that iOS works, and is intended to work. So if an Apple employee complained, they would be told (correctly) that they don't know what they are talking about.
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A casual yet sincere warning to all Apple employees. This is necessary to maintain security standards, code of conduct as well as credibility issues. Most large corporations have this to protect themselves as well as make people aware that they exist.
It's not a "warning". What I get at my company is mostly common sense and what I would expect any decent person to do anyway. Some is a gentle reminder not to get carried away when talking in public. And some things around anti-trust law are an explanation what is legal and what is illegal. So only the most anti-social people would have to change their behaviour because of this.
There are things where as an employee I would want a concrete answer. Like "what am I allowed to post on MacRumors". In my case: Anything about the company that isn't confidential, with my own name under it, and stating that it is my opinion and not the company's. Since gnasher729 is not my real name, nothing

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Does this policy also apply to Apple employees cooperating with the NSA to spy on its users?
It applies to anyone, but I don't think there are any Apple employees actively cooperating with the NSA to spy on Apple's users. If you have any concrete reason to believe they do and not just stupid insinuations, tell us.