Exemption from securities law for government-linked transactions and certain convertible instruments, with power to notify further exemptions. Section 28 exempts transactions by the Government, the Reserve Bank, local authorities and corporations constituted by special law from the Securities Contracts (Regulation) Act, and excludes convertible bonds, share warrants and related options or rights insofar as they permit obtaining shares at the original issue price. The Central Government, with SEBI's delegated capacity, may notify further classes of contracts to be excluded, subject to specified conditions, limitations or restrictions in the interest of trade, commerce or economic development.