Since the beginnings of the modern fragrance industry, fragrance manufacturers have relied on secrecy to protect information about distillation techniques, product composition, and other elements of the production process. In the last century, however, increases in employee mobility and improvements to reverse engineering techniques have undermined the fragrance industry’s reliance on trade secrecy to protect its proprietary information. Patents and copyrights are similarly of limited efficacy as a means of protecting this information. Fragrance manufacturers may have some recourse in trademark and unfair competition law, however, specifically in the context of multisensory trade dress.