The USGS spectral library 06 is public domain data.

The software in this directory is open source with the following license.

# This software was written by Roger N. Clark and colleagues and falls under the following license:
# 
# Copyright (c) 1975 - 2022, Roger N. Clark,
#                            Planetary Science Institute, PSI
#                            rclark@psi.edu, and colleagues named in the code.
# 
# All rights reserved.
# 
# GNU General Public License https://www.gnu.org/licenses/gpl.html
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#   Redistributions of the program must retain the above copyright notice,
#   this list of conditions and the following disclaimer.
#
#   Neither Roger N. Clark, Planetary Science Institute, nor the names of
#   contributors to this software may be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
#   Translation/recoding into other languages: the translation and source code
#   must be made available for free.
#
#   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS IS"
#   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
#   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
#   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
#   BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
#   OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
#   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
#   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
#   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
#   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
#   THE POSSIBILITY OF SUCH DAMAGE.

