Using a copyrighted work without license is copyright infringement. Not sure how to make that clearer to you.

> Using a copyrighted work without license is copyright infringement

Only for the kinds of “use” that involve the exclusive rights of the copyright owner (“use” generally does not), and even then not always, because there are exceptions to copyright.

If I put a book a don't have a license to under a table leg to make it stop wobbling, it is not copyright infringement