How to use free sound for commercial use?
<p>I discovered that some sound effects in Minecraft comes from web sites that offers free sfx, some of these sounds are under the 'CC BY-NC 3.0' licence which is a non-commercial one.</p>

<p>Yet, Minecraft use these sounds commercially as the game is not free.</p>

<p>How is it possible?</p>

<h2>There are several possibilities</h2>
<ol>
<li>The effects are not the same</li>
<li>Minecraft has them under a different licence from the owner</li>
<li>Minecraft is committing copyright violation</li>
<li>And the most likely: they belong to Minecraft and someone has illegally uploaded them to the site</li>
</ol>

copyright software music