<human>:  What is the difference between a copyleft and a copyright?
<bot>: The main difference between copyleft and copyright is that copyleft is a type of license that permits the free use, reuse, and distribution of copyrighted work, whereas copyright is a form of intellectual property protection that grants creators exclusive rights to use and license their work. Copyleft generally allows anyone to share and adapt the work as well as make money from the work, while copyright does not. Copyleft also offers more flexibility for users to modify the copyrighted work, while copyright requires them to get explicit permission to do so.