+ A notice dated more than 1 year later than the date of first
publication;
+ A notice without a name or date that could reasonably be considered
part of the notice;
+ A notice that lacks the statement required for works consisting
preponderantly of U.S. Government material; and
+ A notice located so that it does not give reasonable notice of the
claim of copyright.

The omission of notice does not affect the copyright protection, and no
corrective steps are required if the work was published on or after
March 1, 1989. For works published between January 1, 1978, but before
March 1, 1989, no corrective steps are required if:

1. The notice is omitted from no more than a relatively small number of
copies or phonorecords distributed to the public; or

2. The omission violated an express written requirement that the
published copies or phonorecords bear the prescribed notice.

In all other cases of omission in works published before March 1, 1989,
to preserve copyright:

1. The work must have been registered before it was published in any
form or before the omission occurred, or it must have been registered
within 5 years after the date of publication without notice; and

2. The copyright owner must have made a reasonable effort to add the
notice to all copies or phonorecords that were distributed to the
public in the United States after the omission was discovered. If