(legal term) Stealing protected information within businesses known only to a limited number of persons working there. Typically, information that competitors would very much want to have to gain a market advantage falls into this category of proprietary information. Research and development (R&D) records, legal records, and customer and supplier lists also place in this category. Brenner, S. Article V: Fraud and Theft Crimes. [Online, 1999.] University of Dayton School of Law Website. http://cybercrimes.net/99MSCCC/MSCCC/Article5/ 5.02.1.html.