What is copyright permission?
It is the process of getting consent from the copyright owner of the work to use that owner’s material in whatever form you are going to use it (e.g., a book). You will sometimes hear permission referred to as “licensing” — essentially the copyright owner is granting you a license to use the material in the way that has been agreed upon by both parties. Unless the material is in the “public domain” or your use is considered a “fair use”, you must seek permission from the owner to use it. If you do not seek permission, you may be infringing and may be subject to legal action.