The New Taiwan Dollar (TWD) is not a restricted currency. It operates as a freely convertible currency, meaning it can be exchanged for other global currencies (such as USD, EUR, JPY) without government-imposed limitations on the amount or purpose for most current account transactions.
While the Central Bank of the Republic of China (Taiwan) manages monetary policy and may intervene to stabilize volatility, there are no capital controls restricting convertibility akin to "restricted" currencies like the North Korean Won or previously the Chinese Yuan (though CNY is now managed float).