Say Designer A was working for Company Z. Designer A worked on various graphics materials such as pamphlets, posters etc. After Designer A leaves, Company Z hires a freelancer Designer B to do some poster designs. Designer B uses various elements of previous designs done by Designer A, such as text layout, color gradients etc. Now Designer B has that poster included in the portfolio with no supplementary descriptions for that particular work. Is there a case for Designer A to get Designer B to take down that particular work from the portfolio or is this just a matter of ethics?
Sorry if a little vague as I'm asking this question in place of a friend.