Copyright assignment is the transfer of ownership rights from one party (the copyright owner) to another party (the assignee) for a particular work protected by copyright. This transfer of ownership rights allows the assignee to legally use, distribute, and make commercial use of the work without requiring permission from the original copyright owner. The transfer is usually done in writing, with a document known as a "Copyright Assignment Agreement," which outlines the terms of the transfer, including the specific rights being transferred, the duration of the transfer, and any compensation being provided to the original copyright owner. It's important to note that copyright assignment must comply with copyright laws and can only transfer rights that are specifically outlined in the agreement.