Since the first edition of this outline was published in 2009 and the second and third editions were published in 2014 and 2017, Illinois case law addressing the protection of confidential and trade secret information has continued to develop, especially with the advent of the federal Defend Trade Secrets Act of 2016. This fourth edition contains updated case law references throughout the outline and adds new information, including about recent cases applying and interpreting the Defend Trade Secrets Act, the evolving jurisprudence and laws concerning restrictive covenants in employment relationships in Illinois, the intersection between claims for misappropriation of trade secrets and other common law and statutory causes of action, and the protection of social media content.