The feds run various websites and create content for various reasons. NASA images are free to reuse with attribution, and lots of astronomy sites do. But you wo

The feds run various websites and create content for various reasons. NASA images are free to reuse with attribution, and lots of astronomy sites do. But you wouldn't want someone making a copycat of the reservation site and scamming people. So it makes sense for the US gov to assert some rights to protect its services--and the people it serves.