Editing Fair use (section)

=== Additional factors ===
As explained by Judge Leval, courts are permitted to include additional factors in their analysis.<ref name=Leval />

One such factor is acknowledgement of the copyrighted source. Giving the name of the photographer or author may help, but it does not automatically make a use fair. While [[plagiarism]] and copyright infringement are related matters, they are not identical. Plagiarism (using someone's words, ideas, images, etc. without acknowledgment) is a matter of professional ethics, while copyright is a matter of law, and protects exact expression, ''not'' ideas. One can plagiarize even a work that is not protected by copyright, for example by passing off a line from Shakespeare as one's own. Conversely, attribution prevents accusations of plagiarism, but it does not prevent infringement of copyright. For example, reprinting a copyrighted book without permission, while citing the original author, would be copyright infringement but not plagiarism.