What can be a work that is accepted as official in a fictional literary universe, a religious law, or a camera?
Fictional universe fandom often create a kind of fan-made canon (fanon) to patch up such errors; "fanon" that becomes generally accepted sometimes becomes actual canon. Other fan-made additions to a universe (fan fiction, alternate universe, pastiche, parody) are usually not considered canonical unless they get authorized. Shared universes often come about when a fictional universe achieves great commercial success and attracts other media. For example, a successful movie may catch the attention of various book authors, who wish to write stories based on that movie. Under U.S. law, the copyright-holder retains control of all other derivative works, including those written by other
Fictional universe Fictional universe A fictional universe is a self-consistent setting with events, and often other elements, that differ from the real world. It may also be called an imagined, constructed or fictional realm (or world). Fictional universes may appear in novels, comics, films, television shows, video games, and other creative works. A fictional universe can be almost indistinguishable from the real world, except for the presence of the invented characters and events that characterize a work of fiction; at the other extreme, it can bear little or no resemblance to the real world, with invented fundamental principles of time and space.