body: If I have developed an application on my own time and using my own resources, and that application could be highly valuable in performing my job, can I use it to get my work done without endangering my rights to my own intellectual property?
  
  
  For example, say I have developed software that allows me to mark up PDF documents with great ease. This was done on my own time, using my own tools and equipment. If part of my job changes and I actually need to mark up PDFs for work, and I use my own custom tool to do it, am I opening the door to my employer having any rights to my software? Could they say that since I am using it for work, they have some claim to it?
  
  
  Thanks!
  
  
  
title: Use of custom designed software at work?