anchor.diff:  1,Ruby's or GPLv2 or later
   1,Ruby License
   4,Ruby
  +3,Public domain
   20,Public Domain
  -3,Public domain
   1,Proprietary
   1,PAL
   1,New-BSD
  
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
  