title: What should every developer know about legal matters?
body: <p>Today <a href="https://stackoverflow.com/questions/1394623/can-i-dynamically-call-a-lgpl-gpl-software-in-my-closed-source-application">I had a bad surprise</a> learning about some implications of the GPL license, mainly that I couldn't use it as freely as I thought. </p>
  
  <p>Now I know.</p>
  
  <p><strong>What else should I know, and more widely, what should every developer know about legal things like that?</strong> </p>
  
  <p>You can separate employees, freelancers, open source projects contributors (etc.) or give a more broad answer.</p>