Originally published by Robert Clark .
Since the publication of Edward Snowden’s revelations concerning NSA surveillance, there has been a heightened interest in the use of “warrant canaries.” A warrant canary is a notice posted by an internet service provider saying that the provider has not received any government requests that it would not be allowed to divulge. If the notice is discontinued, users can reasonably infer that the provider has received such a request. The “canary” in the name comes from the use of canaries to detect toxic gas in coal mines. Examples of the kinds of requests a provider would be prohibited from divulging include orders from the Foreign Intelligence Surveillance Court—such as those used in the NSA’s PRISM and telephony metadata collection programs—and national security letters issued by the FBI.
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