A more thorough explanation:

Definition: Proper law refers to the substantive law that governs a transaction under the principles of conflict of laws.

For example, if a contract is made between parties in different countries, the proper law would be the law of the country that has the closest connection to the transaction. This could be the country where the contract was signed, where the goods were delivered, or where the services were performed.

Another example would be if a person is injured in a car accident while traveling in a foreign country. The proper law would be the law of the country where the accident occurred, as that country has the closest connection to the transaction.

These examples illustrate how proper law is determined based on the principles of conflict of laws, which aim to resolve disputes that involve multiple legal systems.