body: If Chinese company ABC has an established brand for their product, "The Widget", and American company XYZ makes an add-on or modification for that product and sells said add-on as "The Widget Improver", with or without reference to ABC, is there copyright implications?
  
  
  I felt XYZ was enhancing and benefiting ABC, but someone today suggested I may have a problem as the name insinuates "The Widget" is inferior as-is, and also copyright infringement since "The Widget" is in XYZ's product name and, specifically, because XYZ's product specifically functions due to the "The Widget" being in the marketplace.
  
  
  I could use specific names and examples but I wasn't sure what is expected on this site.
  
  
  I found [this article](http://www.entrepreneur.com/answer/221456), which sort of addresses my question and suggests that a license agreement is necessary. But is it really necessary, or only necessary from ABC's (and that author's) point of view?
  
  
  
title: Copyright implications for developing/marketing a 3rd party accessory?