“Not All licensors would want to give up all their rights on their works. These licenses enable you to control how other people use your work.”
But in case if you want to put your work in the public domain, you can use public domain dedication, CC0 -“No Rights Reserved” by Creative commons.
Now, what is CC0? Well, in contrast to CC’s licenses that allow copyright holders to choose from a range of permissions while retaining their copyright, CC0 empowers yet another choice altogether – the choice to opt out of copyright and database protection, and the exclusive rights automatically granted to creators – the “no rights reserved” alternative to CC licenses.