이 파일은 미국 법전 제17편 제1장 제105조에 따른 미국 연방정부의 공무원 또는 피고용인이 공무상 작성한 저작물로, 미국에서 퍼블릭 도메인입니다. 주의: 본 라이선스는 미국 연방정부의 저작물에 관해서만 효력이 있습니다. 미국의 주, 군, 기타 지방자치단체가 만든 저작물에 대해서는 적용되지 않습니다. 또한 미국 우정청이 1978년부터 발행한 우표 디자인에도 적용되지 않습니다.
이 저작물은 모든 저작인접권을 포함한 저작권법하의 규제로부터 자유로운 것으로 확인되었습니다.

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proper copyright notices between 1923-1963 may be protected if properly renewed, while works published after 1963 and unpublished photographs in the collection may be protected even if they were not registered with the Copyright Office.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