Warrant canary
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A warrant canary is a method by which a communications service provider aims to inform its users that the provider has not been served with a secret government subpoena. Secret subpoenas, including those covered under 18 U.S.C. §2709(c) of the USA Patriot Act, provide criminal penalties for disclosing the existence of the warrant to any third party, including the service provider's users. A warrant canary may be posted by the provider to inform users of dates that they have not been served a secret subpoena. If the canary has not been updated in the time period specified by the host, users are to assume that the host has been served with such a subpoena.
Autralia
Some sort of warrant canary are illegal in Australia since 2015.
Had a warrant canary
Apple had a warrant canary, but no longer have. One might assume from this that they have been pressured by clandestine forces.
