Which concept involves determining how much of a document can be used without violating copyright?

The correct answer is Fair Use. This concept specifically refers to a legal doctrine that allows limited use of copyrighted material without needing to seek permission from the copyright holder. Fair Use takes into consideration several factors, including the purpose of use (whether it is for commercial or educational purposes), the nature of the copyrighted work, the amount of the work used, and the effect that this use may have on the market value of the original work.

Understanding Fair Use is crucial for educators, researchers, and content creators, as it provides a framework for using existing works while respecting the rights of the original authors. This allows for creativity, commentary, criticism, and scholarship to thrive without infringing on copyright laws, which can otherwise restrict the sharing of information and ideas.

Other concepts like Plagiarism involve the ethical consideration of using someone else's work without proper attribution, but do not focus specifically on legal use. Attribution refers to giving credit to the original creator of the work, which is separate from the legal allowances of Fair Use. Public Domain refers to works that are free of copyright protection, meaning they can be used without restrictions, but does not pertain to the use of copyrighted documents.