Why should I register my work if copyright protection is automatic?
By Andrew Hudson Published: August 14, 2012 Updated: October 24, 2013
If you want to be able to sue for damages.
“Registration is recommended for a number of reasons. Many choose to register their works because they wish to have the facts of their copyright on the public record and have a certificate of registration. Registered works may be eligible for statutory damages and attorney’s fees in successful litigation. Finally, if registration occurs within 5 years of publication, it is considered prima facie evidence in a court of law.”
— U.S. Copyright Office