Copyright (C) 2023 Standards of Fundamental Astronomy Board of the
International Astronomical Union.

SOFA Software License

NOTICE TO USER:
BY USING THIS SOFTWARE YOU ACCEPT THE FOLLOWING SIX TERMS AND CONDITIONS
WHICH APPLY TO ITS USE.

1.  The Software is owned by the IAU SOFA Board ("SOFA").

2.  Permission is granted to anyone to use the SOFA software for any
purpose, including commercial applications, free of charge and without
payment of royalties, subject to the conditions and restrictions listed
below.

3.  You (the user) may copy and distribute SOFA source code to others, and
use and adapt its code and algorithms in your own software, on a
world-wide, royalty-free basis. That portion of your distribution that does
not consist of intact and unchanged copies of SOFA source code files is a
"derived work" that must comply with the following requirements:

a)  Your work shall be marked or carry a statement that it (i) uses
routines and computations derived by you from software provided by SOFA
under license to you; and (ii) does not itself constitute software provided
by and/or endorsed by SOFA.

b)  The source code of your derived work must contain descriptions of how
the derived work is based upon, contains and/or differs from the original
SOFA software.

c)  The names of all routines in your derived work shall not include the
prefix "iau" or "sofa" or trivial modifications thereof such as changes of
case.

d)  The origin of the SOFA components of your derived work must not be
misrepresented; you must not claim that you wrote the original software,
nor file a patent application for SOFA software or algorithms embedded in
the SOFA software.

e)  These requirements must be reproduced intact in any source distribution
and shall apply to anyone to whom you have granted a further right to
modify the source code of your derived work.

Note that, as originally distributed, the SOFA software is intended to be a
definitive implementation of the IAU standards, and consequently
third-party modifications are discouraged. All variations, no matter how
minor, must be explicitly marked as such, as explained above.

4.  You shall not cause the SOFA software to be brought into disrepute,
either by misuse, or use for inappropriate tasks, or by inappropriate
modification.

5.  The SOFA software is provided "as is" and SOFA makes no warranty as to
its use or performance. SOFA does not and cannot warrant the performance or
results which the user may obtain by using the SOFA software. SOFA makes no
warranties, express or implied, as to non-infringement of third party
rights, merchantability, or fitness for any particular purpose. In no event
will SOFA be liable to the user for any consequential, incidental, or
special damages, including any lost profits or lost savings, even if a SOFA
representative has been advised of such damages, or for any claim by any
third party.

6.  The provision of any version of the SOFA software under the terms and
conditions specified herein does not imply that future versions will also
be made available under the same terms and conditions.

In any published work or commercial product which uses the SOFA software
directly, acknowledgement (see www.iausofa.org) is appreciated.

Correspondence concerning SOFA software should be addressed as follows:

By email: sofa@ukho.gov.uk
By post: IAU SOFA Center
HM Nautical Almanac Office
UK Hydrographic Office
Admiralty Way, Taunton
Somerset, TA1 2DN
United Kingdom


