Answer:
Trade secret
Step-by-step explanation:
In simple words, Trade secrets are indeed a category with copyrighted works which really involves recipes, methods, procedures, structures, devices, trends, or knowledge outtakes that have intrinsic commercial significance since they are not commonly understood or easily verifiable by anyone, and that the individual takes appropriate steps to keep confidential.
Those documents are called classified knowledge in some countries. Trade secrets are just an essential yet intangible part of the property rights (IP) of an corporation. Their relation to the valuation of a business, calculated because its market capitalization, can also be substantial.