I was thinking of writing a magazine article on a rabbi I knew well before his death some years back. I wrote to his son to see if he could help me with stories, history, photographs, etc. He declined, worried that he might speak loshon hara about the members of the community, and he wanted me to make sure that I was familiar with the "halachos" regarding writing a biography of a gadol. To be frank, I had no idea that there were specific halachos on this subject. Could someone explain to me what he is talking about? Is it something beyond shimiras haloshon?
No, there is no specific set of laws called "hilchos biography", perhaps he was using Halachos colloquially to say "do you know the way to go about writing a biography" ie. How to phrase certain things, what to leave out, what names to change etc.