The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse
It is an anonymous work, pseudonymous or a collective work and 70 years have passed since the date of its publication
It is another kind of work, and 70 years have passed since the year of death of the author (or last-surviving author)
It is a a posthumous work, published at first time during 30 years and 70 years have passed since the date of its publication
The Article 25.3 (amendment) was added in 2008: “Duration of protection determined by this Law shall be applied to all works of which term of protection has not expired until this Law enters into force”. Works of authors who died in 1970 or earlier, or anonymous works published 1970 or earlier, are public domain in Azerbaijan.
You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Jamaica has 95 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Honduras has a general copyright term of 75 years, but it does implement the rule of the shorter term. Copyright may extend on works created by French who died for France in World War II (more information), Russians who served in the Eastern Front of World War II (known as the Great Patriotic War in Russia) and posthumously rehabilitated victims of Soviet repressions (more information).
This image of simple geometry is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship.
Heptagon
Captions
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