Anderson has the right to leak information to the press?
Your bias here is stunning.
Ann's lawyer wants a face-to-face meeting to establish accountability of the information. Anderson wants a letter so he has plausible deniability - especially given the already established pattern of leaking info to the press.
That would only work if the information only went to Anderson and no further, which it could not do. Also, if this is such an innocent matter, what possible damage could come of the information getting out?