Final answer:
The unauthorized reproduction of copyrighted work is known as piracy, which is illegal and violates intellectual property rights.
Step-by-step explanation:
The unauthorized publication or reproduction of copyrighted work is commonly referred to as piracy. Copyright is a form of legal protection that prevents the copying, for commercial purposes, of original works of authorship, like books and music. This type of intellectual property implies ownership over an idea, concept, or image, ensuring creators receive credit and compensation for their work. Unauthorized use of such work, including copying, reproduction, or distribution, without permission from the copyright holder is illegal and is defined as piracy.