Let's say that ABC Inc provided me some confidential information (CI) for a potential contract that never went through. Now XYZ Inc has approached me and asked to work on this contract with them.
Can I use (but not share with XYZ or anybody else) the information I was provided by ABC? For example, let's say that this is a proprietary communication format. XYZ only wants me to verify that the network is operating correctly and that the messages are exchanged, they do not want detailed information on the data or the format.
Both XYZ, ABC, and I are US-Based companies.