Complex sentence: Copyright misuse is an equitable defense against copyright infringement in the United States allowing copyright infringers to avoid infringement liability if the copyright holder has engaged in abusive or improper conduct in exploiting or enforcing the copyright.
Split into simpler sentences: Copyright misuse is an equitable defense against copyright infringement in the United States. Under this defense, a copyright infringer may avoid infringement liability if the copyright holder has engaged in abusive or improper conduct in exploiting or enforcing the copyright.