anchor.diff:  2,"UNLICENSE"
   1,"To be decided"
   1,"The Ruby License"
  +1,"The BSD 3-Clause License"
   1,"THE (extended) BEER-WARE LICENSE"
   6,"Simplified BSD"
  +1,"See LICENSE."
   1,"Ruby's"
   1,"Ruby's or GPLv2 or later"
   7,"Ruby"
   1,"Ruby License"
   2,"R2CORBA"
  +1,"PUBLIC DOMAIN"
   30,"Public Domain"
  -1,"PUBLIC DOMAIN"
   4,"Public domain"
   1,"Proprietary"
   1,"PayPal SDK License"
  
positive.code: count,license
  1,"zlib"
  13,"WTFPL"
  1,"WTF"
  
negative.code: 4,"GPLv3+"
  23,"GPLv3"
  2,"GPLv2+"
  8,"GPLv2"
  8,"GPL3"
  1,"GPL2"
  1,"GPL-3.0"
  31,"GPL-3"
  29,"GPL-2"
  24,"GPL"
  1,"GPL v3.0"
  1,"GPL v3"
  1,"GPL v2"
  1,"GPL Lv.3"
  1,"GNU"
  1,"GNU LGPL v3"
  1,"GNU LGPL 3"
  1,"GNU Lesser General Public License, Version 3.0"
  1,"GNU GPLv3"
  1,"GNU GPLv3 and AGPLv3"
  