Comment You don't even have to do that (Score 1) 211
You don't even have to state the work is copyrighted; copyright notices became optional in the U.S. in 1988 when we became a member of the Berne Union. The only issue is that if you don't have a notice the person who is sued can claim 'innocent infringement' and reduce damages.
Also, the term 'all rights reserved' is completely deprecated. This notice gives special protection under the Buenos Aires Convention, a special copyright convention from around 1912. As of about 1990 every member of the Buenos Aires Convention was also a member of the Berne Union, which doesn't require copyright notices at all, therefore the term 'all rights reserved' is now completely superfluous. (There are very limited technical exceptions regarding when a copyright expires which doesn't apply for most people because copyrights last for life plus many years, either 50 or 70 depending on which country has stayed with the old version of the Berne Convention or the newer version.)