Res inter alios acta
Encyclopedia
Res inter alios acta, aliis nec nocet nec prodest (Latin for "a thing done between others") is a law doctrine which holds that a contract
Contract
A contract is an agreement entered into by two parties or more with the intention of creating a legal obligation, which may have elements in writing. Contracts can be made orally. The remedy for breach of contract can be "damages" or compensation of money. In equity, the remedy can be specific...

cannot adversely affect the rights of one who is not a party to the contract.

"Res inter alios" has a common meaning: "A matter between others is not our business."

Insurance contracts

Many UK cases cite insurance contracts as being res inter alios acta.
It seems to be in line with the "privity of contract" doctrine.

case law: George E. Taylor & Co. v. Percy Trentham (1980)

Taylor were nominated subcontractors to Trentham. They also had a contract with the employer (collateral contract) whereby they warranted due performance of the subcontract works so that the main contractors should not become entitled to an extension of time. The employer paid Trentham only £7,526 against an interim certificate of £22,101. The amount withheld was the balance payable to the subcontractors after deduction of the main contractor's claim against them for delay. It was held that the employer was not entitled to withhold the money as the contract between the employer and the subcontractor was res inter alios acta. (Ashworth, 2006, contractual procedures in the construction industry 5th edition, pearson prentice hall)
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