Apple takes our commitment to protecting your data very seriously and we work incredibly hard to deliver the most secure hardware, software and services available. We also believe every customer has a right to understand how their personal information is handled.
For government information requests, we report as much detail as we are legally allowed. When we receive an account request from law enforcement requesting a customer’s personal information, we will notify the customer a request concerning their personal data was made unless we are explicitly prohibited from doing so. We are reserving the right to make exceptions, such as for extreme situations when we believe disclosing information could put a child or other person in serious danger, or where notice is not applicable to the underlying facts of the case.

Source : Report on Government Information Requests – Apple