anchor.diff:  4,Simplified BSD
   1,Ruby's or GPLv2 or later
   4,Ruby
  +19,Public Domain
   3,Public domain
  -19,Public Domain
   1,Proprietary
   1,New-BSD
   2,New BSD License
  
positive.code: 4,Artistic 2.0
  1,APLv2
  1,apachev2
  8,APACHE2
  1,apache2
  3,Apache-2.0
  2,Apache v2
  6,Apache License, Version 2.0
  
negative.code: 6,Apache License 2.0
  6,Apache License (2.0)
  1,Apache Licence 2.0
  31,Apache 2.0
  1,Apache 2
  7,Apache
  1,all of them
  