4 terms

21 Things Thing 7 Be Legal and Fair Q1

fair use
the doctrine that brief excerpts of copyright material may, under certain circumstances, be quoted verbatim for purposes such as criticism, news reporting, teaching, and research, without the need for permission from or payment to the copyright holder
the legal right to be the only one to reproduce, publish, and sell a book, musical recording, etc., for a certain period of time
public domain
materials belonging or being available to the public as a whole, and therefore not subject to copyright
creative commons license
allows you to keep your copyright but allows others to copy and distribute your work provided they give you credit and only on the conditions you specify