ydb/contrib/libs/qhull/COPYING.txt

                    Qhull, Copyright (c) 1993-2020
                    
                            C.B. Barber
                           Arlington, MA 
                          
                               and

       The National Science and Technology Research Center for
        Computation and Visualization of Geometric Structures
                        (The Geometry Center)
                       University of Minnesota

                       email: qhull@qhull.org

This software includes Qhull from C.B. Barber and The Geometry Center.  
Files derived from Qhull 1.0 are copyrighted by the Geometry Center.  The
remaining files are copyrighted by C.B. Barber.  Qhull is free software 
and may be obtained via http from www.qhull.org.  It may be freely copied, 
modified, and redistributed under the following conditions:

1. All copyright notices must remain intact in all files.

2. A copy of this text file must be distributed along with any copies 
   of Qhull that you redistribute; this includes copies that you have 
   modified, or copies of programs or other software products that 
   include Qhull.

3. If you modify Qhull, you must include a notice giving the
   name of the person performing the modification, the date of
   modification, and the reason for such modification.

4. When distributing modified versions of Qhull, or other software 
   products that include Qhull, you must provide notice that the original 
   source code may be obtained as noted above.

5. There is no warranty or other guarantee of fitness for Qhull, it is 
   provided solely "as is".  Bug reports or fixes may be sent to 
   qhull_bug@qhull.org; the authors may or may not act on them as 
   they desire.