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 astronaut crew patches are also permitted on merchandise, but in some instances NASA may recommend that the names of astronauts be removed from the patches to avoid issues relating to endorsement, or rights of publicity." From NASA
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