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	Quest'opera è nel pubblico dominio negli Stati Uniti d'America poiché è opera del Governo Federale degli Stati Uniti secondo i termini del titolo 17, capitolo 1, sezione 105 del Codice USA. Vedi anche Copyright per maggiori informazioni. Nota: la norma si applica solo ad opere prodotte dal governo federale e non dai singoli stati, territori, commonwealth, contee, suddivisioni, municipalità o qualsiasi altra suddivisione degli Stati Uniti. Non si applica inoltre ai francobolli pubblicati dallo United States Postal Service fino al 1978 (vedi 206.02(b) of Compendium II: Copyright Office Practices).
Questo file è stato identificato come libero da restrizioni conosciute riguardanti le leggi sul copyright, compresi tutti i diritti connessi e vicini.

https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse

...However, any copyright held by ACME that is still current would now be owned by CORBIS. In an attempt to determine if ACME registered any copyrights and if those copyrights were renewed, Specialists in the Prints and Photographs Division of the Library of Congress searched the Copyright Office files. It was found that only a few images were registered for copyright and those copyrights were not renewed. However, the Library’s legal office has advised the Division that photographs published with proper copyright notices between 1923-1963 may be protected if properly renewed, while works published after 1963 and unpublished photographs in the collection may be protected even if they were not registered with the Copyright Office. Additionally, researchers should be advised that determining the copyright status of photographs can be problematic because of the lack of pertinent information, and researchers often have to make calculated risk decisions concerning the appropriate use of an image when its copyright status is unknown or ambiguous.

— https://www.loc.gov/rr/print/res/220_acme.html