Hermann, an individual who is a Country Y citizen and resident, and nonresident alien, acquires Patent X from an unrelated person. Hermann is not engaged in any trade or business. Hermann then sells all of the U$.$S$.$ rights in Patent X to DomesticCo, a U$.$S$.$ corporation. DomesticCo will use the patent in the United States to produce and sell Product X only to U$.$S$.$ customers. The price paid to Hermann is based solely on the U$.$S$.$ sales of Product X$.$ No tax treaty applies to this transaction.

Issue: In what country will the income from the sale of Patent X be sourced?