English to Bulgarian Law/Patents Law (general)

proffer session
From US law: a meeting between a person who is a subject of a federal criminal investigation, the person's lawyer, and a prosecutor or investigator subject to the terms of a proffer letter

Proffer sessions are meetings between prosecutors and individuals who are the focus of an ongoing investigation. They are commonplace in criminal investigations. While a proffer session carries the potential to reduce or resolve a client's criminal exposure, it also presents a great deal of risk.
— John McCaffrey and Jon Oebker