diff --git a/COPYING b/COPYING
index 14cb6d6..b6986d5 100644
--- a/COPYING
+++ b/COPYING
@@ -1,19 +1,28 @@
-Copyright (c) 1993, 1994 by Richard Kelsey and Jonathan Rees.
-Copyright (c) 1994, 1995 by Olin Shivers and Brian D. Carlstrom.
-
-   Use of this program for non-commercial purposes is permitted provided
-that such use is acknowledged both in the software itself and in
-accompanying documentation.
-
-   Use of this program for commercial purposes is also permitted, but
-only if, in addition to the acknowledgement required for
-non-commercial users, written notification of such use is provided by
-the commercial user to the authors prior to the fabrication and
-distribution of the resulting software.
-
- This software is provided ``as is'' without express or implied warranty.
+Copyright (c) 1993-1999 Richard Kelsey and Jonathan Rees
+Copyright (c) 1994-1999 by Olin Shivers and Brian D. Carlstrom.
+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. The name of the authors may not be used to endorse or promote products
+   derived from this software without specific prior written permission.
 
+THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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.
 
 Distributing Autoconf Output
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