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.
Cette œuvre est dans le domaine public car elle a été publiée aux États-Unis entre 1929 et 1977 inclus, sans indication de copyright. À moins que son auteur ne soit mort depuis suffisamment longtemps, elle n'est pas dans le domaine public dans les pays ou régions qui n'appliquent pas la règle du terme le plus court pour les travaux provenant des États-Unis, comme le Canada (cinquante ans pma), la Chine continentale (cinquante ans pma, Hong Kong et Macao exclus), l'Allemagne (soixante-dix ans pma), le Mexique (cent ans pma), la Suisse (soixante-dix ans pma) et d'autres pays signataires d'accord bilatéraux. Voir cette page pour de plus amples explications.
{{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...