anchor.diff:  2,http://www.apache.org/licenses/LICENSE-2.0.txt
   1,GSLv3
   1,GPLv3+
  -5,GPLv3
  +6,GPLv3
   2,GPLv2
   5,GPL3
   14,GPL-3
  -15,GPL-2
  +16,GPL-2
   1,GPL v3.0
   1,GPL Lv.3
  -11,GPL
  +12,GPL
   1,GNU Lesser General Public License, Version 3.0
   1,GNU GPLv3 and AGPLv3
   1,GNU GPL
  
positive.code: 1,APLv2
  1,APL 2.0
  1,apachev2
  1,apache2
  10,APACHE2
  3,Apache-2.0
  1,Apache, Version 2.0
  2,Apache v2
  
negative.code: 1,CC-BY-NC-SA 3.0
  8,CC BY-NC-SA 3.0
  1,BSD-3-clause
  1,BSD-2-Clause
  8,BSD 3-Clause
  3,BSD 2-Clause
  28,BSD
  