title: Forking an Apache License v2 open source project and copyright notices
body: <p>I'm planning to fork an open-source project which is licensed under Apache License v2. Most of the existing sources have a copyright notice in the heade, Copyright bla bla, Inc.</p>
  
  <p>If I change some these sources in my fork (even if only marginally), what happens to the copyright? Will it become a joined copyright notice like "Copyright bla bla, Inc and Thomas"?</p>