Most of OpenPGM is licensed under the terms of the GNU Lesser Public License,
the LGPL, with a special exception:

  As a special exception, the copyright holders of this library give
  you permission to link this library with independent modules to
  produce an executable, regardless of the license terms of these
  independent modules, and to copy and distribute the resulting
  executable under terms of your choice, provided that you also meet,
  for each linked independent module, the terms and conditions of the
  license of that module. An independent module is a module which is
  not derived from or based on this library. If you modify this
  library, you must extend this exception to your version of the
  library.

See the file COPYING for details of the LGPL.

The ultra-high performance partial checksum & folding routines that are taken
from the Linux kernel and licensed under the terms of the GNU General Public
License, the GPL, see the file COPYING.GPL for details.

Hence you should treat the libraries libpgm, libpgmsnmp, and libpgmhttp of
OpenPGM as being LGPL licensed, with the special exception, and the library
libpgmplus as being GPL licensed.

