title: Is it possible for someone to change an open sourced program to a commercial program?
body: <p>1- If there is a Version 1 of a software under GPL license and a version 2 under a commercial license, can other developers continue working on Version 1 of the software and have their own version of the program?</p>
  
  <p>2- Alternatively, is it possible for the original author to change the license of a currently open-source software to a commercial software and thus preventing others from making free versions of it? And are new programs created from when it was open-source now against the law?</p>