Do I have to register my copyright with the government?
No. When you author a work, you create a copyright that you can use or sell. However, if you want to sue someone to prevent them from using your copyright without permission in the U.S., then you need to register your copyright with the U.S. Copyright Office. Other countries have different rules on what is required to enforce a copyright.
Pro Tip: U.S. law encourages people to register their copyrights. If you register your copyright before someone infringes upon it, you may have certain additional remedies available to you, like the right to recover statutory damages and attorneys’ fees.