Русско-англо-русский юридический словарь

The law of obligations is one branch of private law under the civil law legal system. It is the body of rules that organizes and regulates the rights and duties arising between individuals. The specific rights and duties are referred to as obligations, and this area of law deals with their creation, effects, and extinction. (Wikipedia)

"The law of obligations is traditionally divided into two categories – contractual obligations, which are thought of as being entered into voluntarily and owed only to the parties contracting ( and obligations in tort, which are owed to a larger class of people and thought of as being imposed by law (Beatson {2002} – Ansons Law of Contract).")