The unlicensed selling of an illegal copy may likewise constitute an infringement. As a result, it is critical that you identify whether the works you copy are still protected by copyright or are in the public domain. If they are not, you should not copy them. Works entered into the public domain cannot be protected by copyright and therefore can be freely copied. These include: poems, songs, stories, artworks, photographs, and films. Copyright protection for these items ends when they enter the public domain or if the creator dies without renewing the copyright. In other words, once a work enters the public domain, it can be reproduced and sold without permission from its owner. Copyrighted works remain protected even after they have been published or broadcast. The only time copyright expires is if the creator dies without renewing their copyright or if they give up their rights by failing to register their work with the copyright office within five years of publication. So yes, you can sell an infringing copy of a work that has entered the public domain. However, even if a work is still under copyright, you should not copy it unless you have permission from the owner.