> For works first published on or after March 1, 1989, use of the copyright notice is optional. Before March 1, 1989, the use of the notice was mandatory on all published works. Omitting the notice on any work first published from January 1, 1978, to February 28, 1989, could have resulted in the loss of copyright protection if corrective steps were not taken within a certain amount of time. Works published before January 1, 1978, are governed by the 1909 Copyright Act. Under that law, if a work was published under the copyright owner's authority without a proper notice of copyright, all copyright protection for that work was permanently lost in the United States.
> For works first published on or after March 1, 1989, use of the copyright notice is optional. Before March 1, 1989, the use of the notice was mandatory on all published works. Omitting the notice on any work first published from January 1, 1978, to February 28, 1989, could have resulted in the loss of copyright protection if corrective steps were not taken within a certain amount of time. Works published before January 1, 1978, are governed by the 1909 Copyright Act. Under that law, if a work was published under the copyright owner's authority without a proper notice of copyright, all copyright protection for that work was permanently lost in the United States.