"This work is in the public domain because it was published in the United States between 1923 and 1963 and although there may or may not have been a copyright n

"This work is in the public domain because it was published in the United States between 1923 and 1963 and although there may or may not have been a copyright notice, the copyright was not renewed." - https://en.wikipedia.org/wiki/File:Felix_the_cat.svg https://en.wikipedia.org/wiki/File:Felix_the_cat.svg ... although then someone disputed that on the Wikipedia page.