Some people are afraid that if they make their works open to change, they may be embarrassed by being associated with a poorly edited or modified work.
To avoid this problem, people can ask to not be attributed with any modifications, or can use ND to prevent people from distributing modified versions of their works.
So far, the opening up of copyright restrictions by the copyright owner is allowed, and holds up in court.
By adding a Creative Commons License, the copyright owner essentially gives up the legal ability to sue someone for infringement, based on license type added to the work by the copyright owner.
If the Creative Commons license was added illegally, and the copyright owner can prove it, then that is another story.
Bottom line: Don't add a Creative Commons License exception to works you do not have the right (or permission) to license.
A Creative Commons License may give you permission to add a license modifying their copyright to your derivative (remix or adaptation) of a work you borrow.
The best protection from plagiarism is to keep track of your sources and attribute/cite what you borrow. Give credit where it is due.
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