body: We are using some of my pre-existing, personally copyrighted open source software libraries at my employer. Recently they have asked me to "fix" the copyright so that it is theirs.
  
  
  I have no objection to them owning a version of the code, i.e. that they own the copyright to, however I want to retain the ownership and copyright of the original code as it existed before I came here.
  
  
  Is there a reasonably painless way to achieve this?
  
  
  Thanks.
  
  
  Cross-posted from Open Source, per a commenter's suggestion.
  <https://opensource.stackexchange.com/questions/6230/can-i-assign-a-2nd-copyright-to-my-employer>
  
  
  
title: Can I assign a 2nd copyright to my employer