The original copy of the photo was part of a newspaper library. The newspaper pasted a clipping on its back and then applied its copyright stamp to the back for the pasted text. The text has been obscured and the copyright marking for this text removed. The newspaper would have no rights or ownership over the photo; this was received by them from CBS.
There are no copyright markings pertaining to the image as can be seen in the links above.
United States Copyright Office page 2 "Visually Perceptible Copies The notice for visually perceptible copies should contain all three elements described below. They should appear together or in close proximity on the copies.
2 The year of first publication. If the work is a derivative work or a compilation incorporating previously published material, the year date of first publication of the derivative work or compilation is sufficient. Examples of derivative works are translations or dramatizations; an example of a compilation is an anthology. The year may be omitted when a pictorial, graphic, or sculptural work, with accompanying textual matter, if any, is reproduced in or on greeting cards, postcards, stationery, jewelry, dolls, toys, or useful articles.
Este archivo se encuentra en el dominio público en los Estados Unidos porque fue publicado en ese país entre los años 1929 y 1977 (ambos incluidos) sin haber indicado un aviso de derechos de autor. A menos que su autor haya fallecido años antes, se mantiene bajo propiedad intelectual en los países o zonas que no aplican la regla del plazo más corto para las obras estadounidenses, como Canadá (50 años p.m.a.), China continental (50 años, a excepción de Hong Kong o Macao), Alemania (70), Suiza (70), México (100) y otros países con reglas particulares. Vea esta página y este diagrama como referencia e información.
{{Information |Description=Photo of The Mamas and the Papas performing on ''The Ed Sullivan Show''. From left-Michelle Phillips, Cass Elliot, Denny Doherty, and John Phillips. |Source=[http://www.ebay.com/itm/1968-Mamas-and-Papas-Pop-Singers-Press-Phot...