How much of a copyrighted work can I use under fair use? There are not a lot of clearly defined rules about fair use. Thus, there are no rules such as “you can use up to 30 seconds” of a video or musical recording. Related articles What if I give credit to the original artists? Does fair use apply to the background music in my video? What is fair use? How do Vimeo moderators decide if a video qualifies as fair use? Can Vimeo tell me if my video counts as fair use? Can't find what you're looking for?