anchor.diff:  2,"LGPLv2"
   1,"LGPLv2 or later"
   1,"LGPL3"
  -1,"LGPL-3.0"
  +2,"LGPL-3.0"
   10,"LGPL-3"
   13,"LGPL"
   2,"LAGPL"
   5,"ISC"
   2,"ISC License"
  -1,"Internet Systems Consortium (ISC)"
  +2,"Internet Systems Consortium (ISC)"
   3,"http://www.apache.org/licenses/LICENSE-2.0.txt"
   1,"http://unlicense.org/"
   1,"GSLv3"
  
positive.code: 2,"UNLICENSE"
  1,"To be decided"
  1,"The Ruby License"
  1,"THE (extended) BEER-WARE LICENSE"
  6,"Simplified BSD"
  1,"Ruby's"
  1,"Ruby's or GPLv2 or later"
  7,"Ruby"
  1,"Ruby License"
  2,"R2CORBA"
  30,"Public Domain"
  1,"PUBLIC DOMAIN"
  4,"Public domain"
  1,"Proprietary"
  1,"PayPal SDK License"
  
negative.code: count,license
  2,"zlib/libpng"
  1,"zlib"
  13,"WTFPL"
  1,"WTF"
  