Reports that the terrorists involved in the Paris attacks used an encrypted messaging system to plan and coordinate the attacks has rekindled the debate over how much information tech companies should share with law enforcement officials.

Law enforcement agencies and tech companies with access to user data such as Apple Inc. AAPL 0.44%, Alphabet Inc GOOGL 2.24% GOOG 2.46% and Facebook Inc FB 1% are constantly performing a delicate balancing act between privacy protection and public safety.

Valuable Data

Three weeks ago, Apple was subpoenaed for access to encrypted data on an iPhone 5 seized in a drug case. The company fought the subpoena and clarified that iPhones with newer versions of Apple’s operating system prevent “anyone without the device’s passcode from accessing the device’s encrypted data.” The company itself is no exception.

‘Dire Consequences’

While Apple and rivals Google and Facebook certainly have…

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