The time period of copyright protection depends on a few factors, including when the work was created. For instance, any work created before 1978 can have a different timeline for copyright protection. As for works created after 1978, the copyright term is valid for the author's entire life plus 70 years after the author is deceased.
According to copyright law, If a work has multiple authors, the copyrights are valid until 70 years after the death of the last surviving author. For works of anonymous and pseudonymous authors, the copyright terms remain for 120 years after the creation and 95 years from the publication of the works. To check if your work can be copyrighted, you can contact a copyright law attorney.