Works First Published before 1978

General Information about the Copyright Notice
	In investigating the copyright status of works first published before January 1, 1978, the most important thing to look for is the notice of copyright. As a general rule under the previous law, copyright protection was lost permanently if the notice was omitted from the first authorized published edition of a work or if it appeared in the wrong form or position. The form and position of the copyright notice for various types of works were specified in the copyright statute. Some courts were liberal in overlooking relatively minor departures from the statutory requirements, but a basic failure to comply with the notice provisions forfeited copyright protection and put the work into the public domain in this country.
Absence of Copyright Notice
	For works first published before 1978, the complete absence of a copyright notice from a published copy generally indicates that the work is not protected by copyright. For works first published before March 1, 1989, the copyright notice is mandatory, but omission could have been cured by registration before or within 5 years of publication and by adding the notice to copies published in the United States after discovery of the omission. Some works may contain a notice, others may not. The absence of a notice in works published on or after March 1, 1989, does not necessarily indicate that the work is in the public domain.
Sound Recordings
	Reproductions of sound recordings usually contain two different types of creative works: the underlying musical, dramatic, or literary work that is being performed or read and the fixation of the actual sounds embodying the performance or reading. For protection of the underlying musical or literary work embodied in a recording, it is not necessary that a copyright notice covering this material appear on the phonograph records or tapes on which the recording is reproduced. As noted above, a special notice is required for protection of the recording of a series of musical, spoken, or other sounds that were fixed on or after February 15, 1972. Sound recordings fixed before February 15, 1972, are not eligible for federal copyright protection. The Sound Recording Act of 1971, the present copyright law, and the Berne Convention Implementation Act of 1988 cannot be applied or be construed to provide any retroactive protection for sound recordings fixed before February 15, 1972. Such works, however, may be protected by various state laws or doctrines of common law.

The above is taken from circular 22 of the US Copyright Office entitled "How to investigate the copyright status of a work" and is not intended as a legal opinion. To read the article in its entirety, follow the below link: