The Economist explains: How does copyright work in space? | The Economist
[T]he space station consists of multiple modules and other pieces (called “elements”) under the registration of the United States, the European Space Agency (ESA) consortium, Russia and Japan. The agreement governing the ISS makes it clear (in Article 5) that the applicable laws, including those governing IP rights, depend on which part of it an astronaut is in. This is most relevant when astronauts conduct science or write accounts of their work, whether for public or private parties, although equally true during their off hours.