body: I can search Google for images that I can commercially reuse without modification with the search tools. However, I don't know what "modification" counts as.
  
  
  I want to display four images on one slide, meaning that one side of the image will be cropped. Is this modification (i.e. not showing the whole image).
  
  
  No modification is shorthand for "no derivative works", as in the Creative commons "No derivatives" license I think.
  
  
  
title: Does cropping an image fall under modification?