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Apple admits to secretly giving governments push notification data
(arstechnica.com)
This is a most excellent place for technology news and articles.
A letter from a senator doesn't carry much legal force. From my understanding of the article, Apple claims they were prohibited from sharing this information, but a simple letter couldn't overturn something like a legal order or court mandate. The change here doesn't support the claim.
It reads more like Apple chose not to disclose in order to avoid the ire of the DOJ, even though it would have been morally more correct to tell the public sooner.