Does StackOverflow own my questions?
<p>I consider my questions brilliant and I want to reserve my rights to publish them in other forums.
Am I allowed to do that or do I need permissions?</p>

<p>This is addressed in the <a href="http://stackexchange.com/legal">terms of service</a>:</p>

<blockquote>
  <ol start="3">
  <li>Subscriber Content</li>
  </ol>
  
  <p>You agree that all Subscriber Content that You contribute to the Network is perpetually and irrevocably licensed to Stack Exchange under the Creative Commons Attribution Share Alike license. </p>
</blockquote>

<p>... and it goes on for another ~600 words if you want to fully understand your rights and obligations with respect to your contributions.</p>

copyright