Copyrighted works can be used if it falls under the following Fair Use Guidelines:

1. the purpose and character of the use, including whether it is of a commercial nature or for nonprofit educational purposes
   • You can use copyrighted work for teaching or instructional purposes but you still must respect the wishes of the person or company holding the copyright. You can not infringe of the copyright holder from benefiting or profiting on their own work. For example, it is okay to hand out copies of a short poem to students in class to read but it is not okay to post the poem on a website or public social site for students and the general public to access. The only exception is for materials in the public domain.
2. the nature of the copyrighted work
   • You should make sure the work is informational in nature. This will help determine whether the use will fall under Fair Use Doctrine or not. Copying from works that are scholarly, scientific, or in the daily news can be used as it encourages the free spread of ideas and benefits the public. However, you should determine the work has already been published and still properly cite your sources.
3. the amount of the portion used in relation to the copyrighted work as a whole, and
   • In the court system, the judge will often consider the amount of work that has been copyrighted. There is no rule of law rather a good guideline to consider is whether the work being used is substantial or not. For example, if a song is over 5 minutes long and you want to sample 1 minute, it may fall under fair use. But if you want to sample 3 minutes of the same song, that would be breaking copyright laws.
4. the effect of the use upon the potential market for or value of the copyrighted work.
   • The fourth, and in some people's opinion the most important, is to consider the effect using the material could have on the person who actually created it. For example, if you take a picture from a famous photographer and reproduce it as an artistic rendering, does that take away the value from the person who took the original picture? In this case, it would and you would be breaking copyright. What about reading a children's book on youtube? Would that have a negative impact on the author and illustrator who created the work? Yes. Again, you would be breaking copyright as it would negatively affect the author and illustrator collecting money from sales of the book.

(https://www.nolo.com/legal-encyclopedia/fair-use-the-four-factors.html)