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http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse
it is a photograph, a cinematographic work or a sound recording and at least 50 years have passed since the end of the year of its publication (or since the year of creation for photographs from before independence in 1947, as per the Copyright Act 1911).
it is a governmental or anonymous work and at least 50 years have passed since the end of the year of its publication.
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Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.