Copyright is a bundle of rights:
Requirements for copyright protection:
Copyright exists from the moment it is created until 70 years after the death of the creator.
Not everything is eligible for copyright protection. These are not protected by copyrght:
Fair Use refers to the section of copyright law (Section 107 of Title 17 of the U.S. Code) that limits the right of creators to control how their work is used. Another way to look at it is to say that it protects the rights of creators who want to incorporate other people’s copyrighted material into their work.
Fair use is a limit on copyright that allows a writer/creator to use someone else’s work to make a new point or idea.
The distinction between what is fair use and what is infringement in a particular case will not always be clear or easily defined. There is no specific number of words, lines, notes, or minutes of audio or video that may safely be taken without permission.
Section 107 specifies four factors to be considered in determining whether or not a particular use is fair:
You are expected to consider all four factors in assessing whether the use of a copyrighted work is "fair".