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]
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Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.