The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2]
(from http://earthobservatory.nasa.gov/IOTD/view.php?id=80337 (Annotated) Quote: Astronaut photograph ISS034-E-32377 was acquired on January 18, 2013, with a Nikon D3S digital camera using a 180 millimeter lens, and is provided by the ISS Crew Earth Ob...)
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