For your information: The “Fair Use” Rule
When Use of Copyrighted Material is Acceptable
In some situations, you may make limited use of another’s copyrighted work without asking permission or infringing on the original copyright.
Sooner or later, almost all writers quote or closely paraphrase what others have written. If you quote me, please limit your use to a single paragraph, link to the rest, giving clear attribution. If you paraphrase me, I expect the same. Thank you.