new_contents: # This file is part of Eigen, a lightweight C++ template library
  # for linear algebra.
  #
  # Copyright (C) 2012 Keir Mierle <mierle@gmail.com>
  #
  # This Source Code Form is subject to the terms of the Mozilla
  # Public License v. 2.0. If a copy of the MPL was not distributed
  # with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
  #
  # Author: mierle@gmail.com (Keir Mierle)
  #
  # Make the long-awaited conversion to MPL.
  
  lgpl3_header = '''
  // Eigen is free software; you can redistribute it and/or
  // modify it under the terms of the GNU Lesser General Public
  // License as published by the Free Software Foundation; either
  // version 3 of the License, or (at your option) any later version.
  //
  // Alternatively, 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.
  //
  // Eigen 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 Lesser General Public License or the
  // GNU General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public
  // License and a copy of the GNU General Public License along with
  // Eigen. If not, see <http://www.gnu.org/licenses/>.
  '''
  
  mpl2_header = """
  // This Source Code Form is subject to the terms of the Mozilla
  // Public License v. 2.0. If a copy of the MPL was not distributed
  // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
  """
  
  import os
  import sys
  
  exclusions = set(['relicense.py'])
  
  def update(text):
    if text.find(lgpl3_header) == -1:
      return text, False
    return text.replace(lgpl3_header, mpl2_header), True
  
  rootdir = sys.argv[1]
  for root, sub_folders, files in os.walk(rootdir):
      for basename in files:
          if basename in exclusions:
            print 'SKIPPED', filename
            continue
          filename = os.path.join(root, basename)
          fo = file(filename)
          text = fo.read()
          fo.close()
  
          text, updated = update(text)
          if updated:
            fo = file(filename, "w")
            fo.write(text)
            fo.close()
            print 'UPDATED', filename
          else:
            print '       ', filename
  
subject: Add preliminary script to relicense Eigen to MPL2.