Creative Commons is a non-profit organization that facilitates the use of creative work, by having creators choose the license for their creative work. Creative Commons does not supersede copyright laws. Creative Commons simply allows users and creators to facilitate the usage of their work by selecting which license they prefer to have users follow.
For more in-depth information about how Creative Commons works please visit the Creative Commons website.
Judging whether a use is "fair" is hard. This is because none of these factors are absolute; all of the factors function on a continuous sliding scale, and the only time a firm answer is provided is after the factors have been considered by a court of law.
Note: Parodies which have disrespected established wholesome iconography have fared poorly under the "fair use doctrine." Courts have ruled that use of these works is not considered to be a “fair use” despite meeting all the requirements associated with “fair use.”
Copyright infringement occurs when a copyrighted work is reproduced, distributed, performed, publicly displayed, or made into a derivative work without the permission of the copyright owner. (Copyright.gov, 2018)