In fact, they have banned ticket purchases related to the second playoff round from Canada. Therefore, they have effectively banned Maple Leafs fans from buying tickets because the purchase will require a U.S. address
The worst part about this? During the series against Boston, and even during the 6th game of the series, there were painfully empty seats at the Panthers' home. Let's just say that if the arena isn't full for the second playoff round, this Panthers' rule might become very embarrassing for the organization.