Let's say I build software for Company A.
Company A then licenses this software out to Company B and Company C.
I have no NDAs in place. Companies B and C both know that I built this software.
Occasionally, I might send and receive emails from someone working at Company C to support their use of the software (answering questions, adding features, etc.).
To what capacity can I say I've "worked with" Companies B and C?
For example, would it be misrepresentative to put that I have worked with Company C on a portfolio or resume?
I doubt there would be any legal repercussions, but just in case, I live and work in the UK and the software is hosted on UK-based servers.