What is the term for the complete relinquishment of copyright by the holder?

The term for the complete relinquishment of copyright by the holder is "Public Domain." When a work enters the public domain, it means that the copyright holder has either intentionally given up their rights to the work or that the copyright has expired. As a result, anyone can use, share, or modify that work without seeking permission or paying royalties to the original creator. This concept is essential in promoting creativity and allowing free access to cultural, educational, and artistic content.

In contrast, the other terms listed are associated with different concepts. A publisher typically refers to a person or company that prepares and distributes a written work but does not involve the relinquishment of copyright. Piracy is the unauthorized use or reproduction of someone else's work, which is a violation of copyright law and not a relinquishment. Plagiarism involves taking someone else's work or ideas and presenting them as one's own, which also does not represent a relinquishment of copyright but rather an ethical breach in using someone's intellectual property.