https://en.wikipedia.org/wiki/Warrant_canary
Warrant canary - Wikipedia
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https://daringfireball.net/linked/2016/03/31/reddit-canary
Daring Fireball: Reddit's Warrant Canary Just Died
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https://trust.zone/post/whats-warrant-canary-of-trustzone-vpn
What is a Warrant Canary of Trust.Zone VPN? - Trust.Zone
Do you know about Trust.Zone's Warrant Canary? A warrant canary is a method by which a Trust.Zone VPN service aims to inform its users that the Trust.Zone...
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https://www.eff.org/deeplinks/2014/04/warrant-canary-faq
Warrant Canary Frequently Asked Questions | Electronic Frontier Foundation
Jan 30, 2015 - What is a warrant canary? A warrant canary is a colloquial term for a regularly published statement that a service provider has not received legal process that...
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