Let's break this command down into parts: 1  ls is a utility. Utilities are also sometimes known as commands all on their own, because they indicate the general idea of what you want. - 2 l is a flag that alters how the utility operates.
Publisher and copyright holder are both different persons, a copy right holder is the author of a piece of art, literary works, drama, novels, story etc etc and a publisher is a person who or a publishing house who takes the copyright from the author or rights of the work and publishes it as a book or film etc etc.
Contact the copyright owner. Once you have determined the copyright owner and the type of rights you need from that owner, it is time to contact the copyright owner. If you know the copyright owner of the work, then that is the place to start. In some cases the owner, in particular if it is a journal or publisher, will provide a website.