Margin requirements for derivative contracts define collateral, eligible derivatives, and regulator authority to specify additional instruments. Defines Margin as collateral posted or collected between derivative counterparties to cover credit risk, adopts the existing regulatory definition of 'Derivative,' and identifies 'Authorised dealer' and the governing Act. Lists Permitted derivative contracts to include foreign exchange derivatives, rupee interest rate derivatives, credit derivatives under the updated direction, and other derivatives the regulator may specify, with unexpressed terms to follow statutory meanings.