(NEWSER)  – It's what the Wall Street Journal describes as a "watershed moment" in the fight over smartphone encryption: A court has ordered Apple to obey the government's demand to unlock the iPhone of one of the San Bernardino shooters, and Tim Cook is refusing to do so.

The CEO released a letter Tuesday night explaining that Apple would challenge what it views as a "chilling" demand from the FBI—to create what Cook calls a "backdoor" to iPhone security measures. "The U.S. government has asked us for something we simply do not have, and something we consider too dangerous to create," he writes. If the government gets this ability to tap into Syed Rizwan Farook's phone, it could tap into any iPhone, says Cook.

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