Final answer:
The channel that never allows modification or reuse of original content is All Rights Reserved. This copyright statement means the owner retains all the legal rights provided by copyright law for their work.
Step-by-step explanation:
Of the given options for alternative channels for licensing copyright, All Rights Reserved is the one that never allows users to change, modify, or reuse the original content. Creative Commons, Public Domain, and Copyleft variously permit some level of use, change, and sharing of works. All Rights Reserved means that the copyright owner has not waived any of their rights, which typically include the exclusive rights to reproduce, distribute, and create derivative works.
A copyright, as defined by the U.S. Copyright Office, is a form of legal protection for 'original works of authorship' which includes a wide range of creative works. The copyright provides the owner with exclusive rights that are normally in effect for the life of the author plus 70 years posthumously.