Apologist: a person who makes a defense in speech or writing of a belief, idea, etc.

I think rprasad said it best:

http://news.ycombinator.com/item?id=3569201

To quote:

  This is the textbook definition of "fair use": 
  providing a copy of an out-of-print, otherwise 
  unavailable news article, for the purposes of 
  supplementing a published news article. (Fair 
  use is a multi-factor test with no fixed 
  requirements...it's basically whatever use 
  is "fair" in the context of the actual use.)