2. Incorporated code

A number of pieces of external code are included in the Exim distribution.

• Regular expressions are supported in the main Exim program and in the Exim monitor using the freely-distributable PCRE library, copyright (c) 2000 University of Cambridge. The source is distributed in the directory `src/pcre'.
• RFC 1413 callbacks are supported in the main Exim program using the libident library made freely available by Peter Eriksson at ftp://ftp.lysator.liu.se. Some modifications have been made in order to support IPv6. The source is distributed in the directory called `src/libident'.
• Support for the cdb (Constant DataBase) lookup method is provided by code contributed by Nigel Metheringham of Planet Online Ltd. which contains the following statements: --------------------------------------------------------------------
  Copyright (c) 1998 Nigel Metheringham, Planet Online Ltd This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This code implements Dan Bernstein's Constant DataBase (cdb) spec. Information, the spec and sample code for cdb can be obtained from http://www.pobox.com/~djb/cdb.html. This implementation borrows some code from Dan Bernstein's implementation (which has no license restrictions applied to it). --------------------------------------------------------------------
  The implementation is completely contained within the code of Exim. It does not link against an external cdb library.
• The Exim Monitor program, which is an X-Window application, includes modified versions of the Athena StripChart and TextPop widgets. This code is copyright by DEC and MIT, and their permission notice appears below, in accordance with the conditions expressed therein.

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