 This contrasts with secondary rights and obligations (such as the duty to pay damages and the duty to restore performances received prior to termination), which arise after a breach of contract.It is not necessary for the parties to agree upon any special rights or obligations other than those essential to their particular contracts ("essentialia"); all obligations concerning the manner, time or place of performance are regulated and are implied by law as soon as the parties have made their contract ("naturalia").For example, if Sa Roj has agreed to sell her motor car to Bosie for R100,000, all the rights and obligations of both of them are regulated by the law.