On cross-border dividend payments, the protocol includes some technical adjustments that update the language in some cases and accommodate particular situations. But there is no change of substance to the possibility of imposing withholding tax on dividends, and Canada domestically imposes that tax.
It's imposed under the treaty at two different rates: a rate of 5% in the case of so-called direct dividends between a subsidiary and the parent corporation, and a rate of 15% in other cases. That's not changed by the protocol.