body: Lets suppose Party A creates material and decides to distribute it under some restrictive license entailing fees or similar.
  
  
  Party B now obtains a copy from the copyright holder A and makes it available under some less restrictive license (which violates the license agreement with A).
  
  
  Party C now obtains a copy from B.
  
  
  What are the implications to B and C provided that:
  
  
  * B obtained the copy legally/illegally
  * B made the copy available under the less restrictive licence knowingly/unknowingly
  
  
  Also, are there significant differences in EU/US?
  
  
  I am asking simply as an interested amateur and have no serious background in law. 
  
  
  
title: Can you be held accountable for copyright infringement due to a mistake by a third party?