Comment by maffydub

In previous employment (as a software engineer), I've been told to do this too - mainly around inventions we were trying to patent. The reason is slightly less nefarious than you might think - for example, someone might casually say that some aspect of their patent is "obvious" but they're saying that as an expert in their field who may have spent months or years thinking about the problem and alternative solutions. However, if it came to court, "even the inventor said this was obvious" is a pretty hard thing to respond to.