C mark

"In order for a work to be copyrighted it must actually show the copyright notice with the date."

Copyright today follows the Berne convention. Templetons explains it htis way: "...almost everything created privately and originally after April 1, 1989 is copyrighted and protected whether it has a notice or not. The default you should assume for other people's works is that they are copyrighted and may not be copied unless you know otherwise."