Is Charles Boyer in the public domain?
No; his films would be protected by the production companies.
One can find pictures of puppies that are considered to be in the public domain on public domain picture collection websites. These are a few of those: Wikimedia, PublicPhoto, Pixabay, PD photo, Photos Public Domain, Picdrome, Alegri Photos, Free Photo Gallery, Public-Domain-Photos, 4Free Photos, Free Stock Image Site, Public Domain Files,Public Domain Depot, Open Galleries, Free Images Collection, Free Digital Photos, Public Domain Photo, Project Public Domain Pictures.
Public Domain pictures are images, photographs, or pieces of art that are free from copyright regulation; this makes them public domain. Companies such as Public Domain Image and Public Domain Pictures offer access to images for free. Other great companies are USA government website, as many of their images are public domain, and PD Images.
The first five books are in the Public Domain in the United States of America. All the books are in the Public Domain in Australia. They are not in the public domain in Britain or many other parts of the world. Edgar Rice Burroughs Inc. has TRADEMARKED several names from the series and are trying to use that as leverage in court to stop public domain usage.