Control your copyright
Copyright is automatic
There is no registration procedure required by the originator of a work to assert copyright. Indeed, copyright exists whether or not the copyright symbol '©' is used. Many creators assign copyright to others, perhaps most commonly to publishers.
Creative Commons is a nonprofit corporation dedicated to making it easier for people to share and build upon the work of others, consistent with the rules of copyright.
It provides free licences and other legal tools to mark creative work with the freedom the creator wants it to carry, so others can share, remix, use commercially, or any combination thereof.
Creative Commons licences are not an alternative to copyright. They work alongside copyright, so that you can modify your copyright terms to best suit your needs.
Publishing books (or dissertations) that include copyrighted material
If you are writing a book that contains "substantial" quotes from published material you must write to the publisher to request permission to use them in your book. It is also important to make clear that people do not redistribute, republish or reformat any of this material. If still in doubt, do not make these documents available to others.
If you are writing a book that you intend to be copied (eg a book of exam questions or exercises) you could seek permission to publish the book as "photocopiable". These types of publication permission are granted by the copyright owner and permit copying irrespective of whether a CLA-type licence is held by the host institution