subject to contract(может быть указано в шапке как проекта договора, так и другого документа, напр., письма с изложением предлагаемых условий договора Евгений Тамарченко)
legal opinion(n the United Kingdom and other common law countries, a legal opinion also refers to written legal advice on a point of law issued by either a barrister (often referred to as "counsel's opinion") or occasionally a senior government law officer, such as an attorney general. wiki Alexander Demidov)
