If you are writing a dissertation, compiling educational resources or doing research, you will probably use materials created by others. you need to follow certain rules.
When you are using materials created by someone else, you always have to reference the source. This prevents plagiarism and credits the creator of the materials.
Using such materials may also cost money. There are buyout policies for higher education, which include payment for some uses of copyrighted material.
Quotes are permitted, but the right to quote is subject to certain conditions. If you have any doubts or questions, please contact your institution's Copyright Information Point. They will be happy to help you