title: Webgl sylvester.js glUtils.js permission
body: <p>Am learning to use webgl and I was following the <a href="https://developer.mozilla.org/en-US/docs/Web/WebGL/Adding_2D_content_to_a_WebGL_context#See_also" rel="nofollow">mozzila tutorials</a>
  While I was, I found out that it was using sylvester.js and glUtils.js. My question is are they open source and free to use? I dont want to run into legal issues if I make a game with them and places ads. I tried googling them but I can't find out anything about their license, please dont downvote I tried to do research</p>