Permission to use, copy, modify, and distribute this software and its documentation for non-commercial purposes and without fee is hereby granted, provided that this copyright notice appears in all distributed copies of this software, and that the licensee does not in any way restrict free use and redistribution of this software or anything derived from it.
Please refer to appropriate documents for the exact terms of GPL.
If you intend to run a public server with this software, please contact the author first. Thank you!