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util/flex/COPYING

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+Flex carries the copyright used for BSD software, slightly modified
+because it originated at the Lawrence Berkeley (not Livermore!) Laboratory,
+which operates under a contract with the Department of Energy:
+
+	Copyright (c) 1990 The Regents of the University of California.
+	All rights reserved.
+
+	This code is derived from software contributed to Berkeley by
+	Vern Paxson.
+
+	The United States Government has rights in this work pursuant
+	to contract no. DE-AC03-76SF00098 between the United States
+	Department of Energy and the University of California.
+
+	Redistribution and use in source and binary forms are permitted
+	provided that: (1) source distributions retain this entire
+	copyright notice and comment, and (2) distributions including
+	binaries display the following acknowledgement:  ``This product
+	includes software developed by the University of California,
+	Berkeley and its contributors'' in the documentation or other
+	materials provided with the distribution and in all advertising
+	materials mentioning features or use of this software.  Neither the
+	name of the University 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR
+	IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+	WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+	PURPOSE.
+
+This basically says "do whatever you please with this software except
+remove this notice or take advantage of the University's (or the flex
+authors') name".
+
+Note that the "flex.skel" scanner skeleton carries no copyright notice.
+You are free to do whatever you please with scanners generated using flex;
+for them, you are not even bound by the above copyright.