Copyright Infringement:The unauthorized use or reproduction of a copyrighted work, which can include the creation of derivative works without the permission of the copyright holder.
Transformative Use:A use of a copyrighted work that significantly alters the original and creates something new, which may be considered fair use and not infringe on the copyright.
Adaptation: The process of converting a work from one medium or format to another, such as turning a novel into a film or a play into a musical, which can result in a derivative work.