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"A notice for the collective work will not serve as the notice for advertisements inserted on behalf of persons other than the copyright owner of the collective work. These advertisements should each bear a separate notice in the name of the copyright owner of the advertisement."
 * MGM did not copyright mark this ad. The then-existent copyright for Exhibitors' Herald-World applied to the magazine's editorial content only. Advertisers wishing to copyright their ads needed to apply for copyright(s) for them.
 * US Copyright Office page 3-magazines are collective works (PDF)
 * 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.
 * 1 The symbol © (letter C in a circle); the word “Copyright”; or the abbreviation “Copr.”
 * 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.
 * 3 The name of the copyright owner, an abbreviation by which the name can be recognized, or a generally known alternative designation of owner.1 Example © 2007 Jane Doe.