copyright

早期freebsd实现

    Copyright 1991 Rich Salz.
    All rights reserved.
    $Revision: 1.4 $

    Redistribution and use in any form are permitted provided that the
    following restrictions are are met:
	1.  Source distributions must retain this entire copyright notice
	    and comment.
	2.  Binary distributions must include the acknowledgement ``This
	    product includes software developed by Rich Salz'' in the
	    documentation or other materials provided with the
	    distribution.  This must not be represented as an endorsement
	    or promotion without specific prior written permission.
	3.  The origin of this software must not be misrepresented, either
	    by explicit claim or by omission.  Credits must appear in the
	    source and documentation.
	4.  Altered versions must be plainly marked as such in the source
	    and documentation and must not be misrepresented as being the
	    original software.
    THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
    WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
    MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.