body: There is [a mobile game](http://www.discgolfbasketstore.com/1025-discgolfgame/) that has TM written behind its name.
  
  
  It is built for iOS and has not been updated for years. I would like to create a new and better version of it, for all operating systems, also maybe commercialize it and make free and premium version.
  
  
  Does the TM symbol mean that I cannot use the name, or the idea, or something else?
  
  
  
title: What rights does a trademark actually give?