Each country has it's own laws on public domain, Creative Commons, and copyright. Please research your country's policies. Here are some resources on copyright.
United States- https://www.copyright.gov/title17/
In the United States, any works published before 1923 are free of copyright. Any works published after 1923 are no longer copyrighted 70 years after the creator's death.
In Europe and Great Britain, works are free of copyright 70 years after the death of the author. There are special exceptions for works published during World War I and II.
In Australia, works are free of copyright 70 years after the death of the author.
New Zealand- http://www.copyright.org.nz/
In New Zealand, works are free of copyright 50 years after the death of the author.