Copyrighted 1947, copyright not renewed. Einstein's estate may still claim copyright on this image, but any such claim would be considered illegitimate by the Library of Congress. No known restrictions.[1]
저작자가 1968년에 사망한 이 작품은 미국, 그리고 저작권 보호 기간이 저작자 사후 50년, 또는 그 이하인 모든 국가에서 퍼블릭 도메인입니다.
This work is in the public domain because it was published in the United States between 1931 and 1963 and although there may or may not have been a copyright notice, the copyright was not renewed.
If the author of this work has been deceased for under 70 years, this work is protected by copyright in Germany, Austria and Switzerland, unless other regulations apply. Therefore, communities of German-language Wikimedia projects have decided that use of this file is not allowed within German-language Wikimedia projects.