body: I'm going to release an open source project, let's call it ABC. My project is a piece of software that is non-commercial. However, ABC already exists as a trademark for an existing company.
  
  
  My project is software. This company sells a consumable product. Would I be infringing on their trademark, or is it okay because they are in completely different "realms"? 
  
  
  
title: When am I infringing on a trademark?