SEE License

The SEE library source is released under what is commonly called a "BSD-style" licence:

/*
                    * Copyright (c) 2003, 2004, 2005, 2006, 2007
                    *      David Leonard.  All rights reserved.
                    *
                    * Redistribution and use in source and binary forms, with or without
                    * modification, are permitted provided that the following conditions
                    * are met:
                    * 1. Redistributions of source code must retain the above copyright
                    *    notice, this list of conditions and the following disclaimer.
                    * 2. Redistributions in binary form must reproduce the above copyright
                    *    notice, this list of conditions and the following disclaimer in the
                    *    documentation and/or other materials provided with the distribution.
                    * 3. Neither the name of David Leonard nor the names of its contributors
                    *    may be used to endorse or promote products derived from this software
                    *    without specific prior written permission.
                    *
                    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
                    * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
                    * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
                    * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
                    * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
                    * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
                    * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
                    * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
                    * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                    * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
                    * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                    * POSSIBILITY OF SUCH DAMAGE.
                    */
                    
                    The separate 'dtoa.c' file is separately licenced, thus:
                    
                    /****************************************************************
                    *
                    * The author of this software is David M. Gay.
                    *
                    * Copyright (c) 1991, 2000 by Lucent Technologies.
                    *
                    * Permission to use, copy, modify, and distribute this software for any
                    * purpose without fee is hereby granted, provided that this entire notice
                    * is included in all copies of any software which is or includes a copy
                    * or modification of this software and in all copies of the supporting
                    * documentation for such software.
                    *
                    * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
                    * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHOR NOR LUCENT MAKES ANY
                    * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
                    * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
                    *
                    ***************************************************************/