anchor.diff:  4,"GPLv3"
   2,"GPLv3 or later"
   1,"GPLv2"
  -1,"GPL3"
  +2,"GPL3"
   2,"GPL-3.0+"
   3,"GPL-3.0"
   6,"GPL-3"
  
positive.code: 1,"Apache v2"
  7,"Apache License, Version 2.0"
  1,"Apache License, v2"
  3,"Apache License 2.0"
  2,"Apache License (2.0)"
  1,"Apache Licence v2"
  15,"Apache 2.0"
  1,"Apache 2"
  1,"ALv2"
  1,"AGPL3"
  1,"AGPL-3.0"
  
negative.code: 1,"Stanford University"
  6,"Ruby"
  2,"RUBY"
  5,"Public Domain"
  2,"Public Domain (CC0)"
  1,"Proprietary"
  1,"Perl Artistic v2"
  1,"MIT-LICENSE"
  841,"MIT"
  1,"MIT License"
  1,"MIT (see LICENSE file)"
  1,"LPGL-3"
  