my industry is so unaware of this sort of thing that it would literally never occur to anyone to include it in a contract or even policies. i've never heard of it being discussed.
I am not worried about personal legal problems. I intend to distribute for free to other people doing similar jobs who are not competitors. I guess the worst is that someone could make me change it or something? I would probably never be in a position to enforce anyway.
It is primarily an educational intervention for other users. So I don't want to do it wrongly enough that it causes confusion.
thanks I will read that!