As of March 1, 1989, the copyright warning does not have to appear for a work to be legally copyrighted. However, it is a good idea to remind people of your copyrights by including a statement such as:
Copyright by [your name]
ALL RIGHTS RESERVED
Consider adding a statement that grants permission or restricts use, such as:
"Permission is given to copy this work provided credit is given and copies are not intended for sale."
"Use or inclusion of any portion of this document in another work intended for commercial use will require permission from the copyright owner."
May 11, 1998 (GMc)