Relicense library as BSD.

Since is a complete rewrite of the code in Ruby, there is
no need to retain the original copyright of GPL.

This will also help with integration and usage in other
implementations like Rubinius.

Did this change with permission of Park Heesob, who donated
this code and give the copyright to RubyInstaller (One-Click)
project.

LICENSE

+Copyright (c) 2009, Park Heesob
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without 
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+* 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.
+* Neither the name of Park Heesob 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 BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.

lib/rbreadline.rb

 # rbreadline.rb -- a general facility for reading lines of input
 #   with emacs style editing and completion.
 
-# Copyright (C) 1987-2005 Free Software Foundation, Inc.
 #
-# This file is part of the GNU Readline Library, a library for
-# reading lines of text with interactive input and history editing.
-#
-# The GNU Readline Library 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, or
-# (at your option) any later version.
-#
-# The GNU Readline Library is distributed in the hope that it will be
-# useful, but WITHOUT ANY WARRANTY; without even the implied warranty
-# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# The GNU General Public License is often shipped with GNU software, and
-# is generally kept in a file called COPYING or LICENSE.  If you do not
-# have a copy of the license, write to the Free Software Foundation,
-# 59 Temple Place, Suite 330, Boston, MA 02111 USA.
-#
-#  Ruby tranlastion
+#  Inspired by GNU Readline, translation to Ruby
 #  Copyright (C) 2009 by Park Heesob phasis@gmail.com
 #
 

lib/readline.rb

-# zlib.rb -- GNU Readline module
+# readline.rb -- GNU Readline module
 # Copyright (C) 1997-2001  Shugo Maed
 #
 # Ruby translation by Park Heesob phasis@gmail.com