Plagiarism is copying material without crediting the source while fair use is a limited nonprofit use. What is Fair Use. Using Sources In Writing What Is Plagiarism Using Ideas Words That Are Not Your Own Without Clearly Acknowledging The Source Of The Information Plagiarism Ppt Download A legal doctrine that portions of copyrighted materials may be used without permission of the copyright owner provided the use is fair and reasonable does not substantially impair the value of the materials and does not curtail the profits reasonably expected by the. . The key difference between plagiarism and copyright infringement is that not all plagiarisms are infringements and not all infringements are plagiarisms. In fact fair use of plagiarism represents a considerable limitation on the otherwise exclusive rights of the holder of a copyright. Definition according to Merriam-Webster. Fair Use - a limitation and exception to the exclu...