Is my copyright valid and enforceable in other countries?
There is no such thing as an international copyright protection that automatically protects your copyrighted work throughout the world. Whether and the extent a copyright of a U.S. citizen will be protected in a particular country depends on the national laws of that country and whether the United States has copyright relations with that country. Fortunately, the United States has copyright agreements in place with most countries that require each country to honor the other country’s citizens’ copyrights. The Copyright Office publishes a circular that provides more information.