Fair use permits the reproduction of creative works for criticism, comment, news reporting, scholarship, research, teaching, and parody.
Your responsibility is to exercise due diligence, make an informed decision and try your best. Making a fair use determination is a balancing test and requires weighing four factors:
Further, works that are transformative are more likely to be fair use. Stanford provides a succinct overview of transformation, which is heavily exercised for parody. Google Books was also declared a transformative fair use.
We recommend the following tools to help you work through fair use decisions and are also happy to help.