Changes

A '''warrant canary''' is a public statement posted by a social media platform to affirmatively state that the company has '''not''' received a [[national security letter]] (NSL) demanding data about the company's users.

A '''warrant canary''' is a public statement posted by a social media platform to affirmatively state that the company has '''not''' received a [[national security letter]] (NSL) demanding data about the company's users.<ref>https://epic.org/privacy/nsl</ref>

The USA [[Patriot Act]] authorizes the federal government to issue national security letters without prior court approval.  A company can challenge an NSL in court, but it is illegal for someone who has received an NSL to reveal it until after any court challenge is completed.  This is the opposite of a tranditional [[search warrant]] which is an application to a court that is a matter of public record and can be discussed with anyone, including the object of the investigation.  However, the law does not prohibit companies from stating that they have not received an NSL.  So many companies are posting these statements (called "a warrant canary") with the understanding that if the company stops making the statement, then readers should assume that it has received an NSL.  For example, And Reddit’s 2014 transparency report stated:<ref>{{cite web|url=https://www.reddit.com/wiki/transparency/2014#wiki_national_security_requests|title=Reddit Transparency Report|accessdate=April 6, 2016}}</ref>

The USA [[Patriot Act]] authorizes the federal government to issue national security letters without prior court approval.  A company can challenge an NSL in court, but it is illegal for someone who has received an NSL to reveal it until after any court challenge is completed.  This is the opposite of a tranditional [[search warrant]] which is an application to a court that is a matter of public record and can be discussed with anyone, including the object of the investigation.  However, the law does not prohibit companies from stating that they have not received an NSL.  So many companies are posting these statements (called "a warrant canary") with the understanding that if the company stops making the statement, then readers should assume that it has received an NSL.  For example, And Reddit’s 2014 transparency report stated:<ref>{{cite web|url=https://www.reddit.com/wiki/transparency/2014#wiki_national_security_requests|title=Reddit Transparency Report|accessdate=April 6, 2016}}</ref>