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]
(NASA Engeneer and Astronaut applicant Enectalí_Figueroa found at NASA site:
http://images.google.com/imgres?imgurl=http://www.nasa-academy.org/images/talifigueroa.jpg&imgrefurl=http://www.nasa-academy.org/org_details_council.html&h=138&w=147&sz=33&hl=en)
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