1. Laudon, K. C., & Laudon, J. P. (2020). Management Information Systems: Managing the Digital Firm (16th ed.). Pearson. In Chapter 8, "Securing Information Systems," the text explicitly discusses the need to protect "valuable proprietary information such as trade secrets, new product development plans, or marketing strategies" and "confidential personal and financial data" (p. 316).
2. University of California, Berkeley. (2023). Data Classification Standard. Berkeley Information Security Office. This official university standard outlines categories for data, including "Protection Level 3 (P3)" for data that is "highly sensitive" and whose unauthorized disclosure could have a severe adverse impact. This level includes "proprietary information" and other confidential data, demonstrating the formal recognition of this concept.
3. Tallon, P. P. (2013). Corporate governance of data: The case for a chief data officer. Proceedings of the 46th Hawaii International Conference on System Sciences, 4991-5000. This academic paper emphasizes that data is a "critical organizational asset" that requires formal governance structures for its protection and management, inherently acknowledging its valuable, and thus often proprietary and confidential, status. (https://doi.org/10.1109/HICSS.2013.155)