Copyright transfer agreement

A copyright transfer agreement or copyright assignment agreement is an agreement that transfers the copyright for a work from the copyright owner to another party. This is one legal option for publishers and authors of books, magazines, movies, television shows, video games, and other commercial artistic works who want to include and use a work of a second creator: for example, a video game developer who wants to pay an artist to draw a boss to include in a game.

Source: Wikipedia — Copyright transfer agreement (CC BY-SA 4.0)