Download:
   http://www.cpan.org/modules/by-category/14_Security_and_Encryption/Digest/Digest-MD4-1.1.tar.gz

Copyright:
   Copyright (C) 2002 Mike McCauley (mikem@open.com.au).

   Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.

   License to copy and use this software is granted provided that it
   is identified as the "RSA Data Security, Inc. MD4 Message-Digest
   Algorithm" in all material mentioning or referencing this software
   or this function.

   License is also granted to make and use derivative works provided
   that such works are identified as "derived from the RSA Data
   Security, Inc. MD4 Message-Digest Algorithm" in all material
   mentioning or referencing the derived work.

   RSA Data Security, Inc. makes no representations concerning either
   the merchantability of this software or the suitability of this
   software for any particular purpose. It is provided "as is"
   without express or implied warranty of any kind.

   These notices must be retained in any copies of any part of this
   documentation and/or software.

References:
   On Debian systems, the full text of the GNU General Public License can be
   found in /usr/share/common-licenses/GPL.

   On Debian systems, the full text of the Perl Artistic License can be
   found in /usr/share/common-licenses/Artistic.