DISCLAIMERS:
 
  The pngzop software is supplied "AS IS".  The Author disclaims all
  warranties, expressed or implied, including, without limitation, the
  warranties of merchantability and of fitness for any purpose.  The
  Author assumes no liability for direct, indirect, incidental, special,
  exemplary, or consequential damages, which may result from the use of
  the pngzop software, even if advised of the possibility of such damage.
  There is no warranty against interference with your enjoyment of the
  computer software or against infringement.  There is no warranty that
  the Author's efforts or the computer software will fulfill any of your
  particular purposes or needs.  This computer software is provided with
  all faults, and the entire risk of satisfactory quality, performance,
  accuracy, and effort is with the user.
 
  LICENSE:
 
  Permission is hereby irrevocably granted to everyone to use, copy,
  modify, and distribute this source code, or portions hereof, or
  executable programs compiled from it, for any purpose, without payment
  of any fee, subject to the following restrictions:
 
  1. The origin of this source code must not be misrepresented.
 
  2. Altered versions must be plainly marked as such and must not be
     misrepresented as being the original source.
 
  3. This Copyright notice, disclaimer, and license may not be removed
     or altered from any source or altered source distribution.