Open licensing facilitates sharing by explicating permission to access, reuse, and re-distribute a copyrighted work with what (if any) restrictions. Creative Commons, a non-profit organization, has created six licenses for copyright holders to grant permission so that others can use their works under specified conditions:
Additionally, there is the CC0 (No Rights Reserved) tool that enables copyright holders to waive all rights and place a work in the public domain. Visit this page for more information about the licenses. View this page for examples of how Creative Commons licenses have been used in real life.
A tool is available to help copyright holders choose an appropriate Creative Commons license to share their works.