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Certainly. If the image is copyrighted, it can be released to the public domain with the caveat that full credit is given for it.
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.
Public domain images are images that are not owned by an individual. They are publicly available images that are free for use. A quick search on the internet resulted in indexes of public domain image databases.
Yes, so long as it is a public domain image, and not a copyrighted one.
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.
No. The eagle itself is a public domain figure, however, there are illustrations of it that are protected by copyright (and possibly trademark). If you use an image that is original (or confirmed to be in the public domain) you should be fine.
Yes, in theory, public domain means there is no copyright. However, there have been cases in which works that were clearly in the public domain have been given "restored" or "retro-active" copyright, making it potentially troublesome. Also, there are other non-copyright issues in some works, including the possibility of personal rights for an image of an individual, including the right of privacy, the right of publicity and commercial use of the image (e.g., to suggest sponsorship). You should also consider the fact that "public domain" in one country does not necessarily imply public domain in all other countries. A work could be copyrighted in one country and not copyrighted in another.
There are many locations to find free public domain images of ships. One of the easiest ways is to do an image search on google. They can also be found through the Library of Congress.
Yes. Materials published before 1923 are in the public domain.
Portraits of J. Marion Sims are in the public domain.
If it was not protected by copyright when it was created, and not published with notice before 1 March 1989, it is in the public domain and cannot be protected.
Very, very rarely. There may be embedded metadata noting its copyright, but even without that, it's safest to assume the image is protected unless proven otherwise.