Somewhat similar to the question of saying lashon hara (negative speech) about oneself: can a person forgo his right to privacy (if that has anything to with lashon hara) and allow other to speak negatively about him, either in particular circumstances or in general?
The end of Sefer Chafetz Chaim Klal 2, allows repeating something potentially harmful about someone if he himself has publicly revealed this information. This, to me, implies that if a person specifically allowed repeating harmful information than it should certainly be permitted to repeat. On the other hand, I got the feeling from other halachos in Sefer Chafetz Chaim (I can't bring any exact quotes, sorry) that it might be prohibited. Could this be a case where laws concerning harmful information be more strict than those regarding negative speech?
Is there anyone who provides a thorough discussion of this issue? It seems like it would come up very often.