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No copyright is asserted for these images. If a recognizable person appears in an image, use for commercial purposes may infringe a right of privacy or publicity. These images may not be used to state or imply the endorsement by NASA or by any NASA employee of a comercial product, process or service, or used in any other manner that might mislead. Accordingly, it is requested that if these images are used in advertising and other commercial promotion, layout and copy be submitted to NASA prior to release.Here's another NASA statement:National Aeronautics and Space Administration, Houston TX 77058
All of the images presented on NSSDC's Photo Gallery are in the public domain. As such, they may be used for any purpose. NSSDC does ask, however, that you acknowledge NSSDC as the supplier of the data. In addition, where the source of the image (by project or as a specific person) is credited in the text, you should also acknowledge that, too.Here is the copyright statement for the HST images:
All of the HST images available via WWW and ftp may be used without restriction as long as credit information accompanies the picture. Credit usually includes the principal scientist responsible for the data, NASA and/or ESA, the European Space Agency. Specific credit information may be found in the captions accompanying the images as plain text files. The captions are available via links from the Web pages as well as separate files in the gif directory on the ftp server.