File README-LEGAL.JPL of Package celestia

In previous builds of Celestia, map images and models taken from 
http://maps.jpl.nasa.gov/ were removed due to unclear licensing. JPL has 
provided clear licensing for these images. A copy of their license (taken 
from https://www.jpl.nasa.gov/imagepolicy/ on 2020-July-13) is provided 
below for convenience.

See also: https://space.jpl.nasa.gov/faq.html

Note that all map images and models come from JPL directly, thus, the 
"Special case" restricting commercial use does not apply.

# JPL Image Use Policy
# Unless otherwise noted, images and video on JPL public web sites (public 
# sites ending with a jpl.nasa.gov address) may be used for any purpose 
# without prior permission, subject to the special cases noted below. 
# Publishers who wish to have authorization may print this page and 
# retain it for their records; JPL does not issue image permissions on an 
# image by image basis.
# 
# By electing to download the material from this web site the user agrees:
# 1. that Caltech makes no representations or warranties with respect to 
# ownership of copyrights in the images, and does not represent others who 
# may claim to be authors or owners of copyright of any of the images, and 
# makes no warranties as to the quality of the images. Caltech shall not be 
# responsible for any loss or expenses resulting from the use of the images, 
# and you release and hold Caltech harmless from all liability arising from 
# such use.
#
# 2. to use a credit line in connection with images. Unless otherwise noted 
# in the caption information for an image, the credit line should be 
# "Courtesy NASA/JPL-Caltech."
#
# 3. that the endorsement of any product or service by Caltech, JPL or NASA 
# must not be claimed or implied.
#
# Special Cases:
# * Prior written approval must be obtained to use the NASA insignia logo 
# (the blue "meatball" insignia), the NASA logotype (the red "worm" logo) 
# and the NASA seal. These images may not be used by persons who are not 
# NASA employees or on products (including Web pages) that are not NASA 
# sponsored. In addition, no image may be used to explicitly or implicitly 
# suggest endorsement by NASA, JPL or Caltech of commercial goods or 
# services. Requests to use NASA logos may be directed to Bert Ulrich, Public 
# Services Division, NASA Headquarters, Code POS, Washington, DC 20546, 
# telephone (202) 358-1713, fax (202) 358-4331, email bert.ulrich@hq.nasa.gov.
# 
# * Prior written approval must be obtained to use the JPL logo (stylized JPL 
# letters in red or other colors). Requests to use the JPL logo may be 
# directed to the Institutional Communications Office, email 
# instcomm@jpl.nasa.gov.
#
# * If an image includes an identifiable person, using the image for 
# commercial purposes may infringe that person's right of privacy or publicity,
# and permission should be obtained from the person. NASA and JPL generally do 
# not permit likenesses of current employees to appear on commercial products. 
# For more information, consult the NASA and JPL points of contact listed above.
# 
# * JPL/Caltech contractors and vendors who wish to use JPL images in 
# advertising or public relation materials should direct requests to the 
# Institutional Communications Office, email instcomm@jpl.nasa.gov.
# 
# * Some image and video materials on JPL public web sites are owned by 
# organizations other than JPL or NASA. These owners have agreed to make their 
# images and video available for journalistic, educational and personal uses, 
# but restrictions are placed on commercial uses. To obtain permission for 
# commercial use, contact the copyright owner listed in each image caption. 
# Ownership of images and video by parties other than JPL and NASA is noted in 
# the caption material with each image.