Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Double-Taxation of Royalties paid for in Korea to a US Company
If treaties are involved for something other than exempting student wages on campus, you shouldn't do it yourself but talk to a licensed US tax adviser (EA/CPA licensed in your state) who's well-versed in the specific treaty. Double taxation provisions generally mean that you can credit the foreign tax paid to your US tax liability, but in the US you can do that regardless of treaties (some countries don't allow that). Also, if you're a US tax resident (or even worse - a US citizen), the royalties related treaty provision might not even apply to you at all (see the savings clause). FICA taxes are generally not part of the income tax treaties but totalization agreements (social security-related taxes, not income taxes). Most countries who have income tax treaties with the US - don't have social security totalization agreements. Bottom line - talk to a licensed professional.