Also, what you consider a "completely different product" may not be so different in the eyes of the law. Before you start putting time and money into creating these "new" products, consult with an intellectual property attorney to make sure you're not running afoul of other people's rights.
Nina L. Kaufman, Esq. is an award-winning New York City attorney, edutainer and author. Under her Ask The Business Lawyer brand, she reaches thousands of entrepreneurs and small business owners with her legal services, professional speaking, information products, and LexAppeal weekly ezine. She also writes the Making It Legal blog.