Penguin Group (USA) Inc. v. American Buddha is a legal case involving copyright infringement. Penguin Group (USA) Inc. was a company that published books and other materials, and they owned the copyright for those materials. American Buddha was another company that published and sold similar types of materials without getting permission from Penguin Group for using their copyrighted materials. Penguin Group sued American Buddha for using their copyrighted materials without permission, and the court ruled in favor of Penguin Group. So, American Buddha had to stop using Penguin Group's materials, and also had to pay money to Penguin Group for using their copyrighted materials without permission.